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Lunar Meteorite
Paired* stones Anoual and Northwest Africa
773, 2700, 2727, 2977, 3160, 3170, 3333, 6950, 7007, 8127, 10656, 10985,
11616, 11703, & 11767
northwestern
Africa
 
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*The
reported find and purchase locations of the NWA 773 clan of lunar meteorite
stones are far too dispersed for all the stones to be terrestrially paired,
that is, all fragments from a single fall. Anoual and Dchira are separated
by 1160 km, for example. Compositionally and mineralogically, these stones
are clearly all related and none like them have been found outside the area
of this map. So either we must accept the
coincidence of launch pairings - one impact on the Moon launched several
stones that all happened to land in Northwest Africa - or that some of the
reported find locations are inaccurate.
(Map
courtesy of Google Earth.)
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Photo
of a sawn face of Northwest Africa 773.
As with Dhofar 287, the stone appears to be a portion of a regolith
breccia that contains a large clast of olivine gabbro and many small
clasts.
(photo
credit: Marvin Killgore; from Fagan et al., 2003)
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A
slice of NWA 2977, which, like NWA 773, is a
olivine gabbro. Tick marks on the scale are spaced at 1 mm intervals.
Thanks to Mike Farmer for the sample.
(photo
credit: Randy
Korotev)
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Sawn
face of NWA 2727 showing three lithologies: (1) basalt (right) and (2)
breccia (left) containing (3) two gabbro clasts including a very
coarse-grained one.
(photo
credit: Stan
Turecki and Tony Irving)
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NWA
2727, a breccia that is dominated by mare basalt.
Tick
marks on scale are spaced at 1-mm intervals.
(photo
credit: Randy
Korotev)
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A
slice of NWA 3160, which is mostly basalt, with breccia along top and right
edge.
(photo
credit: Randy
Korotev)
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NWA
3170 consists subequally of olivine gabbro and brecciated basalt.
(photo
credit: Stefan
Ralew and Martin Altmann)
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A
slice of NWA 3333, a breccia (lower left of center), with a olivine gabbro clast (left) and olivine-phyric basalt
clast (right).
(photo
credit: Randy
Korotev)
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False
color x-ray map of the interior portion of the NWA 3333 section above. Red represents
aluminum, green, magnesium, and blue, iron. In this scheme, red grains are
plagioclase, green are mostly olivine and some magnesian pyroxene, and
purple to blue colors are Fe-rich pyroxene, glass, and ilmenite. A glassy
impact-melt vein with several large vesicles cuts
through the breccia on the right side.
(photo
credit: Katherine
Gibson)
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A
large slice NWA 3170 showing the breccia (middle top) and olivine gabbro
(left, right, bottom. Click on image for enlargement (big).
(photo
credit: Randy
Korotev)
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NWA
6950
(photo
credit: ?)
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NWA
7007
(photo
credit: Greg
Hupé)
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A
polished face of NWA 7007 (width = ~3 cm). Click on image for enlargement
(big).
(photo
credit: Randy Korotev)
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Two
views of of NWA 8127. Click on image for enlargement.
(photo
credit: Peter Marmet)
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Sawn
face of NWA 10656. Click on image for enlargement.
(photo
credit: Darryl Pitt)
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Sawn
face of Northwest Africa 10985. Click on image for enlargement.
(photo
credit: Carl Agee)
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A
different slice of NWA 10985. Click on image for enlargement.
(photo
credit: Randy Korotev)
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Sawn
face of NWA 11616 showing at least three different lithologies
(photo
credit: Darryl Pitt)
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from
The
Meteoritical Bulletin, No. 93, Meteoritics
& Planetary Science 43,
571–632 (2007)
Anoual
Anoual,
Morocco
Find: 2006 May 3
Mass: 5.92 g
Achondrite
(Lunar, mare basalt/gabbro breccia)
History: Nomads
from near Anoual (a village located in the East of Morocco between Bouarfa
and Talsint; about 40 km E-N-E of the latter) learned that the small odd
stones that had been found close to their settlement in June and July of
2005 was indeed a meteorite from the Moon (NWA 2727). After extensive
searching and screening of the soil, Mr. Boujena recovered 12 pieces for a
total mass of 5.92 g, over a small area of about 5 m in diameter. The small
size of the pieces can be explained by the brecciated character of the
stone. Ph. Thomas visited the place in May 2006 and May 2007, participated
in the search, took pictures, in particular of the investigated soil and
registered the GPS coordinates.
Physical
characteristics: Tan greenish stones devoid of fusion
crust.
Petrography: (A.
Jambon, O. Boudouma and D. Badia. UPVI).
Breccia composed dominantly of two lithologies: A phyric basalt and a
gabbro. Basalt with subhedral olivine phenocrysts (<1mm; 20 vol%)
slightly resorbed in a finely crystallized groundmass. Highly fractured
gabbro clasts. Small doleritic clasts with zoned pyroxenes. Mafic areas of
once molten rock with olivine needles. One clast of quenched basaltic melt
with numerous zirconolite needles (0.7 vol%; 0.1 mm) silica and celsian
K-spar. Ilmenite, troilite, chromite. Plagioclase and clinopyroxene.
Carbonate fills the largest fractures.
Geochemistry:
(EMPA) Olivine (Fa45-28, with few crystals >Fa45; FeO/MnO =
97). Pyroxene: from (Mg#= 0.80) pigeonite (Wo10) and augite (Wo45)
to pyroxferroite (Fs70Wo25; FeO/MnO = 70).
Plagioclase (An91-83). Spinel (Cr66Sp25Us3Mt6).
Classification:
Lunar mare basalt/gabbro breccia. Paired with NWA 2727/3160 (and
potentially NWA 3333)
Type specimens:
A total of 1.205 g of sample (one polished section) is on deposit at UPVI. Thomas
holds the main mass.
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from
The
Meteoritical Bulletin, No. 85, Meteoritics
& Planetary Science 36,
A293–A322 (2001)
Northwest
Africa 773
Western
Sahara
Found: 2000 September
Mass: 633 g
Lunar
Meteorite (cumulate olivine norite with regolith breccia)
[see
discussion below regarding classification]
Three
stones of 359 g, 224 g and 50 g, totaling 633 g were sold to Marvin
Killgore (SWML) by nomads who showed him the place of find on a flat dry
desert plain near Dchira, Western Sahara.
Mineralogy
and classification (T. Fagan, UHaw, M. Killgore, SWML):
consists of two distinct lithologies, cumulate rock and regolith breccia;
weathering grade, W1; shock stage, S5. Cumulate portion: modes (vol%) are
olivine = 54.7, pigeonite = 24.2, augite = 5, feldspar (including minor
K-feldspar) = 15.6, opaques (troilite, chromite, Fe-metal) = 0.5; olivine,
Fa28-97, mean Fa31, FeO/MnO = 99±11 g/g; pigeonite,
En64Wo11, FeO/MnO = 53±6 g/g; augite, En49Wo36,
FeO/MnO = 46±6 g/g; plagioclase, An88-91; Ba-rich K-feldspar, An3Ab4Or93
with average BaO = 2.2 wt.%. Breccia portion: contains fragments of cumulate
portion as well as silica glass, hedenbergitic pyroxene, volcanic rocks,
and unusual lithic clasts with fayalite + Ba-rich K- feldspar + silica +
plagioclase; olivine and pyroxene in the breccia have a slightly wider
compositional range towards lower Mg/(Mg+Fe) than in the cumulate portion
of the rock.
Chemical
composition
(D. Mittlefehldt, JSC):
KREEP-rich with strong negative Eu-anomaly. Noble gases (O. Eugster, Physikalisches
Institut, Bern): high solar wind component, 4He/20Ne
= 9, indicative of regolith material.
Specimens:
type specimen, 15 g, NHM; main mass SWML.
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from
The
Meteoritical Bulletin, No. 90, Meteoritics
& Planetary Science 41,
1383–1418 (2006)
Northwest
Africa 2700
Morocco
Find: 2004
Mass: 31.7 g
Achondrite
(lunar, olivine gabbro with regolith breccia)
History: A
light green to dark complete stone of 31.7 g was purchased in Erfoud,
Morocco, in November 2004.
Petrography
and Geochemistry: (T. Bunch and J. Wittke, NAU) The
specimen consists of olivine gabbro and regolith breccia lithologies. The
cumulate olivine gabbro contains ~50 vol% olivine (Fa29.3-34.7;
FeO/MnO = 94), pigeonite (Fs22-28.3Wo5.6-10; FeO/MnO
= 52), augite (Fs13.2Wo38.5), plagioclase and minor
maskelynite (An89), Ba-rich alkali feldspar (Or92An4;
BaO = 8.9 wt%), Cr-spinel, ilmenite, phosphate, and troilite. The breccia
lithology is dominated by small olivine gabbro fragments and also contains
subvariolitic basalt clasts with zoned pyroxenes (Fs44Wo29
to Fs58Wo23; FeO/MnO = 57); plagioclase (An90);
ilmenite, and Fe-rich, low-Ca pyroxene (Fs80.8Wo14);
symplectites of fayalite (Fa91); hedenbergite (Fs60.3Wo32.7);
silica; clear to yellow glass spherules; agglutinates, high silica
fayalitic rocks (Fa95.6); ulvöspinel; K2O-rich glass
(K2O = 8.8; SiO2 = 77 [both wt%]), and pure SiO2.
Classification:
Achondrite (lunar, olivine gabbro with regolith breccia) where the olivine
gabbro is moderately shocked and minimally weathered. Note: This sample may
be paired with NWA 773.
Specimens:
A 6.8 g type specimen and two thin sections are on deposit at NAU. An
anonymous finder holds the main mass.
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from
The
Meteoritical Bulletin, No. 90, Meteoritics
& Planetary Science 41,
1383–1418 (2006)
Northwest
Africa 2727
Morocco
or Algeria
Find: June/July 2005
Mass: 191.2 g
Achondrite
(Lunar mare basalt/gabbro breccia)
History: Four
stones of 30.6 g, 11.6 g, 64 g and 85 g were purchased from Moroccan
dealers in Erfoud for a consortium of North American collectors in June and
July of 2005.
Petrography
and Geochemistry: (T. Bunch and J. Wittke, NAU; A.
Irving and S. Kuehner, UWS;
R. Korotev, WUSL)
All stones are very similar and consist of a clast-dominated polymict
breccias composed of >80 vol% olivine-phyric basalt and
gabbroic/diabasic clasts (0.2 cm to several cm across) within a finer breccia
matrix. The basalt clasts show a wide range in mineral compositions, but
all contain phenocrysts of olivine Fa 28-99 FeO/MnO = 98.9 and
some also have phenocrysts of pyroxferroite or chromite all in a rapidly
quenched, fine-grained matrix consisting of intergrown pigeonite,
pyroxferroite, K-Ba-feldspar, ilmenite, merrillite, baddeleyite, troilite,
silica and glass. The gabbroic clasts range in texture from coarser grained
(>3 mm) hypidiomorphic gabbro to finer grained (~1 mm) diabasic clasts.
Both types of gabbroic lithologies consist mainly of pigeonite Fs23.3-31.3Wo8.7-11.5,
FeO/MnO = 60-69 and subhedral to anhedral olivine Fa34.1-41
FeO/MnO = 85-99 with less abundant augite Fs24.1-47.5 Wo24.4-32.1
and partly maskelynitized, blocky to tabular plagioclase An81-94.
The breccia matrix consists mainly of gabbroic debris with fragments of
basalt, silica polymorph, symplectites, subparallel intergrowths of
anorthite + pyroxferroite+ilmenite and shock-melted material.
Bulk
compositions: (R. Korotev, WUSL) INAA of 11 subsamples
show that they vary considerably in bulk composition, with the most Fe-rich
subsample nearly indistinguishable from NWA 3160 basalt. All other
subsamples are compositionally equivalent to mixtures of NWA 3160 basalt
and the regolith breccia lithology of NWA 773, but with slightly lower
concentrations of incompatible elements. Note:
Based on petrography, mineral compositions, and bulk compositions, these
stones are paired with NWA 3160 and may be paired with NWA 773.
Classification:
Achondrite (lunar, mare basalt/gabbro breccia).
Specimens:
A 20.2 g type specimen and two polished thin sections are on deposit at NAU. A 0.5
g type specimen is on deposit at WUSL.
Oakes, Reed, Boswell, and Turecki hold the main masses.
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from
The
Meteoritical Bulletin, No. 90, Meteoritics
& Planetary Science 41,
1383–1418 (2006)
Northwest
Africa 2977
Morocco
or Algeria
Find: 2005 November
Mass: 233 g
Achondrite
(lunar, gabbro)
History: A
single minimally weathered fusion-encrusted stone of 233 g was purchased
from a Moroccan dealer in Tagounite, Morocco, by M. Farmer in November
2005.
Petrography
and Geochemistry: (J. Wittke and T. Bunch, NAU; A.
Irving, UWS)
The specimen consists of a single yellow-green, relatively coarse-grained
rock traversed by thin, black glass-rich veins. It is an olivine-rich,
twopyroxene cumulate gabbro composed of olivine (Fa31.7; FeO/MnO
= 96; 52 vol%), (Fs26.6Wo6.7; 23 vol%), augite (Fs16.2Wo29;
9 vol%), and plagioclase (An56; 14 vol%) with minor amounts of
Ba-K feldspar, chromite, ilmenite, and merrillite. Larger pigeonite grains
commonly enclose equant olivine grains, which contain abundant melt
inclusions (0.025–0.125 mm). Plagioclase is partially converted to
maskelynite, and pyroxenes and olivine exhibit shock lamellae and
undulatory extinction. Note:
This specimen is identical in texture and mineral composition to the gabbro
clasts in NWA 773 and NWA 2700 and thus appears to be paired with those
breccia specimens.
Classification:
Achondrite (lunar, gabbro); minimal weathering.
Specimens:
A 20.1 g type specimen and one polished thin section are on deposit at NAU. A 0.5 g specimen is on deposit
at WUSL.
An anonymous owner holds the main mass.
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from
The
Meteoritical Bulletin, No. 90, Meteoritics
& Planetary Science 41,
1383–1418 (2006)
Northwest
Africa 3160
Morocco
Find: 2005 July
Mass: 34 g
Achondrite
(lunar mare basalt breccia)
History: In
July 2005, A. and G. Hupé purchased three broken stones with a total weight
of 34 g from a Moroccan dealer in Erfoud, Morocco.
Physical
Characteristics: The largest stone (28 g) has a partial
thin weathered fusion crust.
Petrography: (R.
Zeigler and R. Korotev, WUSL;
A. Irving and S. Kuehner, UWS)
The large specimen consists almost entirely of a fine-grained,
olivine-phyric basalt clast with minor attached breccia matrix and appears
to be part of a larger, coarse-grained, polygenic breccia. The two small
stones are pieces of the breccia. The basalt contains phenocrysts of
euhedral to subhedral olivine (~0.1–0.9 mm) and minor chromite (<0.1
mm).
Geochemistry: Olivine
phenocrysts are zoned, with cores typically Fo55-70 and rims
extending to ~Fo40; FeO/MnO ratios are 91-105. The groundmass
has spinifex olivine Fo29 and skeletal pyroxene En37-39Wo11-13
FeO/MnO = 71-75 set in a fine-grained matrix of pyroxene En35-39Wo20-23,
olivine ~Fo22 and glass. The breccia lithology is a fragmental
breccia consisting primarily of olivine Fo6-82 and pyroxene En1-68Wo9-39Fs16-83,
with minor amounts of plagioclase An82-97 and trace silica;
hedenbergite-fayalite-silica symplectite (after former pyroxferroite), and
Fe-Ti-Cr oxides.
Classification:
Achondrite (lunar, mare basalt breccia). Note: These samples may be paired
with NWA 2727.
Specimens:
A 4.8 g type specimen and one polished thin section are on deposit at UWS. A 2.1
g specimen is on deposit at WUSL.
A. Hupé holds the main mass.
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from
The Meteoritical Bulletin, No. 101
Northwest
Africa 3170
(Northwest
Africa)
Purchased:
2007 April
Mass: 60 g
Lunar
meteorite (gabbro)
History:
Purchased from a Moroccan dealer in 2007 by Stefan Ralew.
Physical
characteristics: A single 60 g stone consisting of large
clasts of yellowish-green gabbro (containing fine, black shock veinlets) in
a darker fragmental matrix.
Petrography: (A.
Irving and S. Kuehner, UWS)
Monomict breccia consisting of ferroan gabbro clasts and related debris.
Predominantly composed of olivine, clinopyroxenes and anorthite with
accessory fayalite, silica, ilmenite and minor K-Ba-feldspar. Symplectitic
intergrowths of hedenbergite+fayalite+silica are
present. No orthopyroxene found.
Geochemistry:
Olivine (Fa29.6-39.9, FeO/MnO = 82-116), pigeonite (Fs42.3Wo11.9,
FeO/MnO = 79), subcalcic augite (Fs28.7Wo26.2,
FeO/MnO = 57), subcalcic ferroaugite (Fs64.4-78.8Wo26.3-26.2,
FeO/MnO = 78-93). Bulk composition (R. Korotev, WUSL): mean values from INAA
of subsamples are 20.7 wt.% FeO, 40 ppm Sc, 56 ppm Co, 110 ppm Ni, 24.3 ppm
La, 11.2 ppm Sm, 0.76 ppm Eu, 8.1 ppm Yb, 4.3 ppm Th.
Classification:
Lunar (mare gabbro breccia). This stone is very similar in mineralogy and
bulk composition to NWA 7007, and both specimens are likely paired with NWA
773.
Specimens:
12.1 g is on deposit at UWS.
The remaining material is held by Ralew.
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from
The
Meteoritical Bulletin, No. 94, Meteoritics
& Planetary Science 43,
1551–1588 (2008)
Northwest
Africa 3333
Morocco
Purchased: 2005 May
Mass: 33 g
Achondrite
(lunar basaltic fragmental breccia)
History:
Fabien Kuntz purchased a 33 g specimen from a Moroccan dealer. The original
main mass was broken into at least 5 pieces and distributed to several dealers..
Physical
characteristics: A partially weathered blackish brown
fusion crust was present on the specimen. Cut and polished surfaces on two
different specimens reveal a coarsely brecciated texture, while a third
specimen exhibits three different lithologies.
Petrography: (R.
Zeigler, WUSL)
The specimen examined consists of one basalt clast (1.5 cm) and one clast
of cumulus olivine gabbro (1.2 cm) set in a fragmental breccia matrix. The
basalt consists of large phenocrysts of zoned olivine and smaller chromite
phenocrysts set in a fine-grained matrix of spinifex olivine, skeletal
pyroxene, and glass. The olivine gabbro is 50% olivine, 35% pyroxene, and
15% plagioclase. A vein of black shock melt separates the cumulate clast
from the fragmental breccia. The breccia is composed predominantly of
pyroxene and olivine clasts, with minor plagioclase, and trace silica,
Fe,Ti,Cr oxides, troilite, chromite, ilmenite, FeNi, apatite, and
RE-merrillite.
Mineral
compositions and geochemistry: Matrix pyroxene and olivine
is Fs17-65Wo12-29En8–61 and Fo5-60;
plagioclase clasts are An86-95Or<2. Olivine in the
basalt is zoned (Fo47-72). Mineral compositions in the olivine
cumulate are Fo68, Fs63Wo15 and Fs52Wo32,
and An92Or1. Fe/Mn = 85–110 (olivine) and 40–77
(pyroxene).
Bulk
composition:
(R. Zeigler and R. Korotev, WUSL)
The basalt (TiO2 = 0.8%, FeO = 21%, MgO= 14%, Th = 1.4 µg/g) is
compositionally similar to that of NWA 3160; the cumulate olivine gabbro
(TiO2 = 0.4%, FeO = 20%, MgO = 27%, Th = 1.2 µg/g) is similar to
NWA 773 and NWA 2977. All lithologies are characterized by low
concentrations of Na2O (= 0.15 ± 0.06 %) and Eu (= 0.4 ± 0.2
ppm) compared to other lunar basalts. The oxygen isotope composition (I. A.
Franchi, OU)
is consistent with lunar origin (δ17O=2.94, δ18O=5.59,
Δ17O = 0.032).
Classification:
Achondrite (lunar basaltic fragmental breccia). The specimen is another
stone of the NWA 773/2700/2727/2977/3160 pair group.
Type specimens:
A mass of 6.55 g is on deposit at DuPont
and 0.4 g (neutron irradiated) and one thin section at WUSL.
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from
The Meteoritical Bulletin, No. 100
Northwest
Africa 6950
Mali
or Algeria
Purchased: 2011 August
Mass: 771 g
Lunar
meteorite (gabbro)
History:
Reported to be found near the border between Mali and Algeria in June 2011, and purchased from the finder by Adam
Aaronson in August 2011.
Physical
characteristics:
A single yellowish-green stone (771 g) with partial fusion crust. Thin
black shock veins are visible in the interior.
Petrography: (A.
Irving and S. Kuehner, UWS) Relatively coarse grained with a cumulate
igneous texture. Aggregate dominated by olivine, low-Ca pyroxene,
pigeonite, and subcalcic augite, with interstitial very calcic plagioclase.
Accessory minerals are ilmenite, Ti-chromite, armalcolite, troilite,
baddeleyite, taenite and merrillite with rare zirconolite and K-feldspar.
Geochemistry:
Olivine (Fa31.9-32.7, Fe/Mn=85-97), low-Ca pyroxene (Fs27.1-28.1Wo4.8-4.5,
Fe/Mn=47-55), pigeonite (Fs25.6±0.0 Wo9.2-11.1,
Fe/Mn=47-52), subcalcic augite (Fs13.9Wo36.9,
Fe/Mn=41), plagioclase (An87.9-93.0Or1.1-0.9).
Classification:
Achondrite (lunar, gabbro). This specimen is texturally and mineralogically
identical to NWA 2977 and the olivine gabbro clasts in NWA 773, NWA 2700,
NWA 2727 and NWA 3333, and evidently is paired with those stones.
Specimens: A
total of 20.1 g of sample and one polished thin section are on deposit at UWS.
The main mass is held by Aaronson.
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from
The
Meteoritical Bulletin, No. 100
Northwest
Africa 7007
Western
Sahara
Purchased: 2011 October
Mass: 91 g
Lunar
meteorite (gabbro)
History:
Found near Smara, southern Morocco in September 2011, and purchased from a
dealer in Zagora, Morocco by Greg Hupé in October 2011.
Physical
characteristics: A single dense, rounded stone (91 g)
partially coated with black fusion crust. Dark angular mineral clasts plus
sparse white clasts are visible within a finer grained dark matrix. One
small polymineralic gabbroic clast is exposed on the surface, and others
are revealed in interior slices.
Petrography: (A.
Irving and S. Kuehner, UWS)
Crystal-rich regolithic breccia consisting of some larger polymineralic
clasts (gabbro and ophitic basalt) and apparently related crystal debris in
a sparse glassy, microvesicular matrix. Major components are anorthite,
complexly-zoned subcalcic augite, ferropigeonite, and relatively large
fragments composed of intergrowths of fayalite+hedenbergite+silica (typical
of subsolidus inversion assemblages from primary pyroxferroite). Accessory
phases include olivine, ilmenite, fayalite, hedenbergite, silica polymorph,
troilite, Ni-free metal and baddeleyite (to 10 µm across within fayalitic
rims on pyroxene). Matrix glass contains abundant small, round vesicles
(typical of those representing trapped solar wind gases in other lunar
regolith breccias).
Geochemistry:
Zoned subcalcic augite [(core Fs22.5Wo31.2,
Fe/Mn=46), mantles (Fs34.2-50.0Wo29.6-25.9,
Fe/Mn=55-65), ferropigeonite rims (Fs66.1Wo19.7,
Fe/Mn=66)], olivine (Fa42.0-44.4, Fe/Mn=86-93), fayalite (Fa98.4,
Fe/Mn=78-84), plagioclase (An91.4.5-93.2Or0.5-0.3).
Classification:
Achondrite (lunar, gabbro breccia). Terrestrial weathering is minimal.
Specimens:
A total of 18.2 g of sample and one polished thick section are on deposit
at UWS.
The main mass is held by an anonymous collector.
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from
The
Meteoritical Bulletin, No. 103
Northwest
Africa 8127
(Northwest
Africa)
Purchased: 2012 March
Mass: 529 g
Classification:
Lunar meteorite (gabbro)
History: Purchased
by Marc Jost in March 2012 in Brugg, Switzerland from a Moroccan dealer.
Physical
characteristics: Fresh, pale green stone (529 g) with
cross-cutting thin, black shock veins. Apple green clinopyroxene and glassy
maskelynite grains are visible.
Petrography: (A.
Irving and S. Kuehner, UWS)
Equigranular igneous rock (mean grain size 0.8 mm) consisting of smaller
grains of olivine, Ti-bearing chromite and ilmenite (with associated
baddeleyite) poikilitically enclosed in clinopyroxene (some containing fine,
subparallel exsolution lamellae), with interstitial anorthitic plagioclase.
Most plagioclase has been converted to maskelynite, but some grains have
patchy birefringence.
Geochemistry:
Olivine (Fa30.0-32.1, FeO/MnO = 90-91), pigeonite (Fs21.4-25.1Wo10.6-9.8,
FeO/MnO = 46-54), subcalcic augite (Fs14.5-15.4Wo32.6-30.5,
FeO/MnO = 39-42). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave
(in wt.%) FeO 18.2, Na2O 0.11, and (in ppm) Sc 29.2, La 4.7, Sm
2.59, Eu 0.21, Yb 2.24, Th 0.56.
Classification:
Lunar (olivine gabbro). This specimen is paired with NWA 6950 and the
gabbroic lithology in NWA 773 and paired stones.
Specimens:
23.7 g, one polished thin section and a polished mount are at UWB. The main
mass is held by Space Jewels Switzerland.
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|
from
The
Meteoritical Bulletin, No. 105
Northwest
Africa 10656
(Northwest
Africa)
Purchased: 2016 January
Mass: 262.5 g
Classification:
Lunar (diabase)
History:
Purchased by Darryl Pitt in January 2016 from a Mauritanian dealer.
Physical
characteristics: A single stone (262.5 g) lacking fusion
crust. The fresh interior is relatively coarse grained and is dominated by
brown, pale green and white grains.
Petrography: (A.
Irving and S. Kuehner, UWS)
Intersertal texture (mean grainsize ~1.5 mm). Composed of simply-twinned
clinopyroxene (both pigeonite and subcalcic augite), olivine (with
secondary brown staining along fractures), laths of calcic plagioclase
(birefringent but with undulose extinction) and accessory ilmenite,
chromite, baddeleyite and zirconolite.
Geochemistry:
Olivine (Fa33.8-34.0, FeO/MnO = 92; Fa45.9, FeO/MnO =
87; N = 3), pigeonite (Fs25.3Wo9.7; Fs33.6Wo11.9;
FeO/MnO = 48-51, N = 2), subcalcic augite (Fs15.8-17.5Wo36.3-34.2,
FeO/MnO = 38-41, N = 3), plagioclase (An88.3-91.6Or4.1-3.4,
N = 2). Bulk composition (R. Korotev, WUSL)
INAA of whole rock powder gave (in wt.%) FeO 19.7, Na2O 0.18;
(in ppm) Sc 34.3, Cr 3190, La 12.4, Sm 5.9, Eu 0.43, Yb 4.0, Lu 0.59, Hf
4.3, Th 1.9.
Classification:
Lunar (olivine diabase). This specimen has affinities with NWA 2977, NWA 6950 and
NWA 8127
based on mineralogical and bulk compositional similarities, but differs in
texture from those meteorites.
Specimens:
22 g including one polished thin section at UWB; remainder with DPitt.
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from
The
Meteoritical Bulletin, No. 105
Northwest
Africa 10985
(Northwest
Africa)
Purchased: 2015
Mass: 250 g
Classification:
Lunar meteorite (gabbro)
History:
Purchased by Jay Piatek in Morocco, 2015.
Physical
characteristics: Single stone, weathered exterior without
fusion crust. A polished saw cut surface reveals two distinct lithologies
separated by a sharp boundary offset, with numerous truncated grains. One
lithology is a light colored, medium-grained gabbro with elongate subhedral
prismatic yellow-green pyroxenes and white subhedral plagioclase laths. The
second lithology is a dark colored, fine-grained breccia with yellow-green
pyroxene fragments scattered throughout. Fine shock melt veins visible.
Petrography: (C.
Agee, UNM) Microprobe examination
of a polished mount shows igneous-zoned pigeonite and augite, plagioclase,
olivine, fayalite, hedenbergite, pyroxferroite, Fe-sulfide, ilmenite,
chromite, Ti-magnetite, apatite, silica, and symplectites.
Geochemistry: C.
Agee and S. Spilde, UNM) Olivine
Fa38.1±21.2, Fe/Mn=95±8, n=31; pigeonite Fs45.9±12.2Wo17.8±5.5,
Fe/Mn=63±10, n=29; augite Fs41.2±16.9Wo30.8±3.9, Fe/Mn=63±11,
n=18; pyroxferroite Fs84.2±1.4Wo14.8±1.4, Fe/Mn=63±2,
n=3; plagioclase An89.5±3.4Ab9.8±3.1Or0.7±0.6,
n=27; shock melt (proxy for bulk composition) SiO2=48.0±2.6, TiO2=1.2±0.7,
Al2O3=11.3±6.0, Cr2O3=0.4±0.2,
MgO=11.6±4.3, FeO=16.5±2.7, MnO=0.24±0.05, CaO=10.9±3.0, Na2O=0.28±0.17,
K2O=0.17±0.11 (all wt%), n=10.
Classification:
Lunar gabbro
Specimens:
20.2 g including a probe mount on deposit at UNM, Jay Piatek holds the main mass.
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from
The
Meteoritical Bulletin, No. 107
Northwest
Africa 11616
(Northwest
Africa)
Purchased: 2017 March
Mass: 2550.8 g
Classification:
Lunar meteorite (gabbro)
History:
Purchased by DPitt
in March 2017 from a Mauritanian dealer.
Physical
characteristics: A single very fresh specimen (2550.8 g)
containing separate olivine gabbro and olivine-free basaltic clasts in a
fragmental matrix.
Petrography: (A.
Irving and S. Kuehner, UWS; S.
Valencia and P. Carpenter, WUSL) Polymict
breccia with two different clast types. Olivine gabbro clasts (mean
grainsize 1.1 mm) consist of equant grains of olivine, zoned clinopyroxene
(pigeonite, ferroan pigeonite, subcalcic augite) and maskelynite with
accessory chromite, ilmenite, troilite, fayalite, taenite and baddeleyite.
A basalt clast has porphyritic texture and is composed mainly of larger
prismatic grains (up to 2.5 mm long) of zoned clinopyroxene and smaller
lath-like grains of maskelynite with accessory ilmenite, chromite, troilite,
silica polymorph, rare baddeleyite, rare K-feldspar and rare Ni-poor
kamacite. The remainder of the breccia consists of related crystalline
debris.
Geochemistry:
Olivine gabbro clasts: olivine (Fa34.6-59.8, FeO/MnO = 83-108, N = 9),
pigeonite (Fs26.4-39.4Wo9.7-11.7, FeO/MnO = 51-70, N = 6), ferroan
pigeonite (Fs43.4-71.4Wo15.4-25.0, FeO/MnO = 57-94, N =3), subcalcic augite
(Fs17.6-28.4Wo27.2-35.6, FeO/MnO = 51-59, N = 5), maskelynite
(85.2-95.6Or2.2-0.1, N = 10). Basalt clast: pigeonite (Fs26.2-26.3Wo6.4-6.5;
Fs29.1Wo11.7; Fs49.8Wo19.1; FeO/MnO = 55-73; N = 4), augite
(Fs21.9-25.6Wo34.7-35.2, FeO/MnO = 49-50, N = 2), ferropigeonite rims
(Fs78.0-78.2Wo18.9-20.3, FeO/MnO = 83-86, N = 2), maskelynite
(An84.4-86.2Or3.6-2.0, N = 2). Bulk composition (R. Korotev, WUSL) INAA of
breccia subsamples gave (in wt.%) FeO 19.1, Na2O 0.25 (in ppm) Sc 42.0, Cr
3230, La 13.6, Nd 22.9, Sm 6.73, Eu 0.578, Tb 1.37, Yb 1.37, Lu 0.66, Hf
5.1, Th 2.0.
Classification: Lunar
meteorite (polymict breccia with olivine gabbro and basalt clasts). The
olivine gabbro lithology is paired with other magnesian gabbro material
present in breccia stones such as NWA 773, NWA 2727 and NWA 3333 and also as discrete meteorites such as NWA 2977, NWA 6950 and NWA 8127. The olivine-free basalt lithology differs from
the olivine-phyric basalt lithology represented by NWA 3160, and is a new member of the complex NWA 773 clan
of lunar meteorites.
Specimens:
20.9 g including a polished thin section and polished endcut at UWB; remainder with DPitt.
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|
from
The
Meteoritical Bulletin, No. 107
Northwest
Africa 11703
(Northwest
Africa)
Purchased: 2015 April
Mass: 5309.1 g
Classification:
Lunar meteorite (gabbro)
History: Purchased
by Darryl Pitt in April 2015 from a dealer in Erfoud,
Morocco.
Physical
characteristics: A single pale greenish stone (5309.1 g)
with thin cross-cutting shock veinlets.
Petrography: (A.
Irving and S. Kuehner, UWS)
Medium grained (grainsize up to 1.4 mm) with cumulate texture. Major
minerals are olivine, pigeonite, subcalcic augite and calcic plagioclase
(predominantly converted to maskelynite with minor birefringent domains);
accessory phases include ilmenite, taenite, troilite, Mg-merrillite and baddeleyite.
Shock veinlets contain dark glass.
Geochemistry:
Olivine (Fa32.1-32.4, FeO/MnO = 91-97, N = 3), pigeonite (Fs26.0Wo9.7;
Fs27.7Wo5.7; FeO/MnO = 47-60; N = 2), subcalcic
augite (Fs16.4-17.5Wo34.9-32.3, FeO/MnO = 46-52, N =
2), plagioclase (An89.7-91.2Or0.8-1.1, N = 2).
Classification:
Lunar (gabbro). This specimen is texturally and mineralogically identical
to NWA 2977, NWA 6950, NWA 8127, and to the olivine gabbro clasts in NWA
773, NWA 2700, NWA 2727 and NWA 3333, and evidently is paired with those
lithologies.
Specimens:
20.1 g including one polished thin section at UWB; remainder held by DPitt.
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|
from
The
Meteoritical Bulletin, No. 107
Northwest
Africa 11767
(Northwest
Africa)
Purchased: 2012
Mass: 15 g
Classification:
Lunar meteorite
History: The
meteorite was purchased from a local meteorite dealer in Erfoud, Morocco.
Physical
characteristics: Many small light greenish fragments
lacking any fusion crust.
Petrography: (A.
Greshake, MNB) Monomict olivine-rich
gabbroic breccia predominantly composed of up to 4 mm sized Fe-rich
olivine, pigeonite, augite and calcic plagioclase. Minor phases include
chromite, troilite and K-feldspar. The meteorite contains abundant shock
melt veins along which some olivine has been transformed into ringwoodite.
Geochemistry:
olivine: Fa31.6±0.2 (Fa31.3-32.0, n=13,
FeO/MnO=85-105); pigeonite: Fs25.6±1.1Wo10.7±2.8 (Fs23.3-27.7Wo5.9-16.4,
n=12, FeO/MnO=46-63); augite: Fs16.1±1.0Wo35.7±2.1
(Fs14.8-17.8Wo32.1-39.0, n=12, FeO/MnO=41-52); calcic
plagioclase: An93.1±0.8 (An91.1-93.9, n=10).
Classification: Lunar
Olivine-Gabbros. The meteorite might be paired with NWA 773 and paired
stones.
|
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Randy
Says…
This
is one of the most unusual of lunar meteorites. It’s unlike any rock in the Apollo
collection. It contains at least 5 different igneous lithologies. The total
mass of these stones is 11.87 kg. I have not analyzed NWA 11767 but assume
it to be part of the pair group on the basis of the description.
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|
Modal Mineralogy of Northwest Africa
773 Cumulate Portion
(values in percent)
|
|
|
Met.Bull.
|
Fagan et al.
|
Jolliff et al.
|
Bridges et al.
|
|
olivine
|
55
|
55.5
|
48
|
66
|
|
augite
|
5
|
8.7
|
12
|
26
|
|
pigeonite
|
24
|
18.9
|
28
|
|
hypersthene
|
|
|
2
|
|
plagioclase
|
15
|
14.2
|
10
|
8
|
|
alkali feldspar
|
minor
|
1.6
|
trace
|
|
|
ilmenite, chromite, alkali feldspar, phosphates,
troilite, FeNi metal
|
<1
|
<1.5
|
<1
|
<1
|
|
The cumulate is coarse grained and the thin sections are small,
so the modal mineral proportions obtained from different sections do not
agree well. Because augite and pigeonite, both clinopyroxenes,
dominate over orthopyroxene, which is at most "minor" (Korotev et
al., 2002), the cumulate is a gabbro, not a norite. Specifically, it
is an olivine gabbro because olivine exceeds 10%. If plagioclase is
actually <10%, then it's a peridotite.
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|
After Stöffler et al.
(1980)
|
|
More
Information
Meteoritical
Bulletin Database
Anoual
| NWA 773 | NWA
2700 | NWA 2727 | NWA
2977 | NWA 3160 | NWA
3170 | NWA 3333 | NWA
6950 | NWA 7007 | NWA 8127 |
NWA 10656
| NWA
10985 | NWA 11616
| NWA
11703 | NWA
11767
References
Borg L. E., Shearer C. K., Asmerom Y., and Papike J. J.
(2004) Prolonged
KREEP magmatism on the Moon indicated by the youngest dated lunar igneous
rock. Nature 432, 209-211.
Borg L. E., Shearer C. K., Asmerom Y., and Papike J. J.
(2005) Geochemical and isotopic systematics of the youngest dated
lunar igneous rock, Northwest Africa 773. Lunar and Planetary Science XXXVI, abstract no. 1026.
Borg L. E., Gaffney A. M.,
Shearer C. K., DePaolo D. J., Hutcheon I. D., Owens T. L., Ramon E., and Brennecka G. (2009) Mechanisms for incompatible-element enrichment on the Moon
deduced from the lunar basaltic meteorite Northwest Africa 032. Geochimica et Cosmochimica Acta 73, 3963-3980.
Bridges J. C., Jeffries T.
E., and Grady M. M. (2002) Trace element signatures of trapped KREEP in olivine- rich
clasts within lunar meteorite NWA773. 65th Meteoritical Society
Meeting, abstract no. 5137.
Bunch T. E., Wittke J. H., Korotev R. L., and Irving A. J. (2006) Lunar meteorites NWA 2700, NWA 2727 and NWA 2977: Mare
basalt/gabbro breccias with affinities to NWA 773. Lunar and Planetary Science XXXVII, abstract no. 1375.
Burgess R., Fernandes V. A.,
Irving A. J., and Bunch T. E. (2007) Ar-Ar ages of NWA 2977 and NWA
3160 - lunar meteorites paired with NWA 773. Lunar and Planetary Science XXXVIII, abstract no. 1603.
Calzada-Diaz A., Joy K. H., Crawford I. A., and Nordheim
T. A. (2015) Constraining the source regions of lunar
meteorites using orbital geochemical data. Meteoritics &
Planetary Science 50, 214-228.
Chen
J., Jolliff B. L., Korotev R. L., Wang K., Wang A., Carpenter P. K., Chen
H., and Ling Z. (2019) Northwest Africa 10985: A new lunar gabbro? 50th Lunar and Planetary Science Conference, abstract no. 2463.
Fagan T. J. (2006) A record
of extreme FeO/(MgO+FeO) enrichment during
igneous crystallization on the Moon preserved in lunar meteorite Northwest
Africa 773. Antarctic
Meteorites XXX, 9-10.
Fagan T. J. (2007) Formation of symplectite-like inclusions by direct
quenching from igneous liquid in lunar meteorite NWA 773. 70th Annual
Meeting of the Meteoritical Society, abstract no. 5204.
Fagan T. (2007) Formation of
symplectite inclusions by direct quenching of a high-FeO/(FeO+MgO) silicate liquid on the Moon. Antarctic Meteorites XXXI, 15-16.
Fagan T. J. (2014) Effect of titanium abundance on silica vs. iron enrichment
in lunar basalts: Modeling and comparisons with Northwest Africa 773.
45th Lunar and Planetary Science Conference, abstract no. 1599.
Fagan T. J. and Nagaoka H.
(2017) Northwest Africa
773 clan olivine cumulate gabbros: Crystallization trends compared with a
gabbroic sill from Murotomisaki, Japan.
80th Meteoritical Society Meeting, abstract no. 6082.
Fagan T. J., Keil K., Taylor
G. J., Hicks T. L., Killgore M., Bunch T. E., Wittke J. H., Eugster O.,
Lorenzetti S., Mittlefehldt D.W., Clayton R.N.,
and Mayeda T. (2001) New lunar meteorite Northwest Africa 773: Dual origin by
cumulate crystallization and impact brecciation. 64th Meteoritical
Society Meeting, abstract no. 5149.
Fagan T. J., Keil K., Taylor
G. J., Hicks T. L., Killgore M., Bunch T. E., Wittke J. H., Eugster O.,
Lorenzetti S., Mittlefehldt D.W., Clayton R.N.,
and Mayeda T. (2001) New lunar meteorite Northwest Africa 773: Dual origin by
cumulate crystallization and impact brecciation. 64th Meteoritical
Society Meeting, abstract no. 5149.
Fagan T. J., Suginohara A., and Kashima D. (2010) Effect of initial
Ti-abundance on Si-enrichment during magmatic evolution of lunar basalts:
Initial modeling results. 33rd
Symposium on Antarctic Meteorites.
Fagan T. J., Wakabayashi Y., Suginohara A., and Kashima D. (2012) Do high Ti abundances in lunar basalts lead to
silica-enrichment? Yes and no. 75th
Annual Meeting of the Meteoritical Society, abstract no. 5110.
Fagan T. J., Wakabayashi Y., Suginohara A., and Kashima D. (2013) Controls and constraints on tholeiite-like and
calc-alkaline-like igneous trends on the Moon from Northwest Africa 773 and
Apollo 15405. 44th Lunar and Planetary
Science Conference, abstract no. 1812.
Fagan T. J., Kashima D.,
Wakabayashi Y., and Suginohara A. (2014) Case study of
magmatic differentiation trends on the Moon based on lunar meteorite
Northwest Africa 773 and comparison with Apollo 15 quartz monzodiorite. Geochimica
et Cosmochimica Acta 133,
97-127.
Fernandes V. A., Burgess R.
and Turner G. (2002) North West Africa 773 (NWA773): Ar-Ar
studies of breccia and cumulate lithologies. The Moon Beyond 2002:
Next Steps in Lunar Science and Exploration, abstract no. 3033.
Fernandes V. A., Burgess R.
and Turner G. (2003) 40Ar-39Ar chronology of lunar meteorites Northwest
Africa 032 and 773. Meteoritics & Planetary Science 38, 555-564.
Fernandes V.A., Burgess R.,
Bischoff A., Sokol A. K., and Haloda J. (2007) Kalahari 009 and North East Africa 003: Young
(<2.5 ga) lunar mare basalts. Lunar and Planetary Science
XXXVIII, abstract no. 1611.
Fernandes V. A. S. M., Fritz
J. P., Wünnemann K., and Hornemann U. (2010) K-Ar ages and shock effects in lunar meteorites. EPSC
Abstracts, Vol. 5, EPSC2010-237.
Fritz J. (2012) Impact
ejection of lunar meteorites and the age of Giordano Bruno. Icarus 221, 1183-1186.
Gaffney A. and Borg L. (2008)
What we are learning about the Moon from lunar meteorites.
Geochimica et Cosmochimica Acta 72, 12S, A287.
Gibson K. E., Jolliff B. L.,
Zeigler R. A., and Korotev R. L. (2010) Testing petrogenetic relationships of the lunar nwa773
meteorite clan with nickel & cobalt in olivine?. 41st
Lunar and Planetary Science Conference, abstract no. 2593.
Hallis L. H. Joy K. H. Anand M.,
and Russell S. S. (2007) Compositional analysis of the very-low-Ti mare basalt
component of NWA 773 and comparison with low-Ti basalts, LAP 03632 &
02436. Lunar and
Planetary Science XXXVIII, abstract no. 1703.
Jolliff B. L., Korotev R. L.,
Zeigler R. A., Floss C., and Haskin L. A. (2003) Northwest Africa 773: Lunar mare breccia with a
shallow-formed olivine-cumulate component, very-low-Ti heritage, and a
KREEP connection. Lunar and Planetary Science XXXIV, abstract no.1935.
Jolliff B. L., Korotev R. L.,
Zeigler R. A., Floss C., and Haskin L. A. (2003) Northwest Africa 773: Lunar mare breccia with a shallow-formed
olivine-cumulate component, very-low-Ti (VLT) heritage, and a KREEP
connection. Geochimica
et Cosmochimica Acta 67, 4857-4879.
Jolliff B. L., Zeigler R. A.,
and Korotev R. L. (2007) Compositional characteristics and petrogenetic
relationships among the NWA 773 clan of lunar meteorites. Lunar and Planetary Science XXXVIII, abstract no. 1489.
Kayama M., Tomioka N., Seto Y., Ohtani E., H
Nagaoka., Fagan T. J., Ozawa Sekine S., T.,
Miyahara M., Miyake A., and Tomeoka K. (2016) Formation process
of high-pressure silica polymorphs in lunar meteorites of the NWA 773 clan.
79th Annual Meeting of the Meteoritical Society, abstract no. 6102.
Kayama M., Nakashima S.,
Tomioka N., Ohtani E., Seto
Y., Nagaoka H., Ozawa S., Sekine T., Miyahara M.,
Miyake A., Götze J., and Tomeoka K. (2016) Water in olivine,
clinopyroxene, and plagioclase of lunar meteorites of the NWA 773 clan by
IR micro-spectroscopy. 79th Annual Meeting of the Meteoritical
Society, abstract no. 6127.
Korotev R. L. (2005) Lunar geochemistry as told by lunar meteorites. Chemie
der Erde 65, 297-346.
Korotev R. L. and Irving A.
J. (2013) Keeping up with the lunar meteorites - 2013. 44th Lunar and Planetary
Science Conference, abstract no. 1216.
Korotev R. L. and Irving A.
J. (2014) Keeping up with the lunar meteorites - 2014. 45th Lunar and
Planetary Science Conference, abstract no. 1405.
Korotev R. L. and Irving A.
J. (2017) Still not keeping
up with the lunar meteorites – 2017. Lunar
and Planetary Science XLVIII, abstract no. 1498.
Korotev R. L. and Zeigler R.
A. (2007) Keeping up with
the lunar meteorites. Lunar and Planetary Science XXXVIII, abstract no. 1340.
Korotev
R. L., Zeigler R. A., Jolliff B. L., and Haskin L. A. (2002) Northwest
Africa 773 - An unusual rock from the lunar maria, 65th Annual
Meteoritical Society Meeting, abstract no. 5259.
Korotev R. L., Irving A. J.,
and Bunch T. E. (2012) Keeping Up With the Lunar Meteorites - 2012. 43rd Lunar and Planetary
Science Conference, abstract no. 1152.
Kuehner S. M., Irving A. J.,
and Korotev R. L. (2012) Petrology and composition of lunar mare ferroan gabbro
breccia Northwest Africa 7007: New insights into the complex petrogenesis of
Northwest Africa 773 and siblings. 43rd
Lunar and Planetary Science Conference, abstract no. 1519.
Lorenzetti S., Busemann H., and Eugster O.
(2005) Regolith history of lunar meteorites. Meteoritics & Planetary Science 40, 315-327.
Macke R. J., Kiefer W. S.,
Britt D. T., and Consolmagno G. J. (2010) Density, porosity and magnetic susceptibility of lunar
rocks. 41st Lunar and Planetary Science Conference, abstract no. 1252.
Macke R. J., Kiefer W. S.,
Britt D. T., Irving A. J., and Consolmagno G. J.
(2011) Densities, porosities and magnetic susceptibilities of
meteoritic lunar samples: Early results. 42nd
Lunar and Planetary Science Conference, abstract no. 1986.
Macke R. J., Britt D. T., and
Consolmagno G. J. (2011) Density, porosity and magnetic
susceptibility of achondritic meteorites.
Meteoritics & Planetary Science 46, 311-326.
Masahiro M., Tomioka N., Ohtani E., Seto Y., Nagaoka
H, Götze J, Miyake A., Ozawa S., Sekine T.,
Miyahara M., Tomeoka K., Matsumoto M., Shoda N., Hirao N., and
Kobayashi T. (2018) Discovery of
moganite in a lunar meteorite as a trace of H2O ice in the Moon’s regolith. Science Advances, 4, eaar4378
McCubbin F. M., Steele A., Hauri E. H., Nekvasil H.,
Yamashita S., and Hemley R. J. (2010) Nominally hydrous magmatism on the Moon. Proceedings of the National Academy of Sciences 107, 11,223-11228.
Nagaoka H. Karouji Y., Takeda H, Ebihara
M., and Hasebe N. (2010) Chemical signatures in bulk element composition for
Northwest Africa 2977. 73rd Annual Meeting of the Meteoritical Society,
abstract no. 5182.
Nagaoka H., Takeda H., Karouji Y., Ohtake M.,
Yamaguchi A., Yoneda S., and Hasebe
N. (2012) Implications
for the origins of pure anorthosites found in the feldspathic lunar
meteorites, Dhofar 489 group. Earth, Planets and Space 66, 115.
Nagaoka H., Fagan T. J., Kayama M., Karouji Y., Hasebe N., and Ebihara M. (2019) Mineralogic and petrologic characterization of a new
silicic clast in lunar brecciated meteorite, Northwest Africa 2727. 50th Lunar and Planetary Science Conference, abstract no. 2270.
Nishiizumi K. and Caffee M.
W. (2006) Constraining the number of lunar and martian meteorite
falls. 69th Annual Meeting of the Meteoritical Society, abstract no.
5368.
Nishiizumi K., Hillegonds D. J., McHargue L.
R., and Jull A. J. T. (2004) Exposure and terrestrial histories of new lunar and martian
meteorites, In Lunar
and Planetary Science XXXV, abstract no. 1130.
North S. N., Jolliff B. L.,
and Korotev R. L. (2013) Pyroxene composition in lunar meteorite NWA 2727 and
comparison to NWA 7007. 44th Lunar and Planetary
Science Conference, abstract no. 3013.
North-Valencia S. N., Jolliff
B. L., and Korotev R. L. (2014) Ferroan gabbro and leucogabbro lithologies in NWA 3170,
possible petrogenetic link and comparison to NWA 2727. 45th Lunar and
Planetary Science Conference, abstract no. 2858.
Nyquist L. E., Shih C.-Y.,
Reese Y. D., and Irving A. J. (2009) Sm-Nd and Rb-Sr ages for Northwest Africa 2977, a young
lunar gabbro from the PKT. 72nd Annual Meeting of the Meteoritical
Society, abstract no. 5347.
Rochette P., Gattacceca J., Ivanov A. V., Nazarov M. A., and Bezaeva N.
S. (2010) Magnetic
properties of lunar materials: Meteorites, Luna and Apollo returned samples. Earth and Planetary Science Letters 292, 383-391.
Seddio
S. M. and Valencia S. N. (2015) Comparing WDS
analyses of minerals in lunar meteorite NWA 2727 Acquired using an electron
microprobe and a scanning electron microscope. 46th Lunar and Planetary
Science Conference, abstract no. 2992.
Shaulis B. J., Righter M., Lapen T. J., and Irving A. J. (2013) 3.1 Ga crystallization age of magnesian and ferroan gabbro
lithologies in lunar meteorites Northwest Africa 773, 3170, 6950 and 7007
and evidence for 3.95 Ga components in NWA 773 polymict breccia. 44th
Lunar and Planetary Science Conference, abstract no. 1781.
Shaulis B. J., Righter M., Lapen T. J., Jolliff B. J., and Irving A. J. (2017) 3.1 Ga
crystallization age for magnesian and ferroan gabbro lithologies in the
Northwest Africa 773 clan of lunar meteorites. Geochimica et Cosmochimica Acta 213,
435-456.
Shearer C. K., Borg L. E.,
and Papike J. J. (2005) A view of KREEP-rich lunar basaltic magmatism through the
eyes of NWA 773. Lunar
and Planetary Science XXXVI, abstract no. 1191.
Stöffler D., Knöll H.-D., Marvin U. B., Simonds C. H., and Warren P.
H. (1980) Recommended classification and nomenclature of lunar
highlands rocks-a committee report. In Proceedings Conf. Lunar
Highlands Crust (eds. J. J. Papike and R. B.
Merrill), 51-70, Pergamon Press.
Tartese R., Anand M., Joy K. H., Franchi I. A. (2014) H and Cl isotope characteristics of apatite in
brecciated lunar meteorites NWA 4472, NWA 773, SaU 169 and Kalahari 009. 77th Annual Meeting of the
Meteoritical Society, abstract no. 5085.
Valencia S. N., R. L.
Korotev, B. L. Jolliff, and Irving A. J. (2017) Petrography and
chemistry of lunar diabasic meteorite Northwest
Africa NWA 10656. Lunar and Planetary Science XLVIII, abstract
no. 2483.
Wakabayashi Y., Fagan T. J.,
Hayakawa S., Sasamoto A. (2011) Evolution of
trapped vs. main liquids during crystallization of Northwest Africa 773
olivine cumulate. Thirty-Fourth
Symposium on Antarctic Meteorites, 85-86.
Wang Y., Guan Y., Hsu W., and
Eiler J. M. (2012) Water content, chlorine and hydrogen isotope compositions
of lunar apatite. 75th Annual Meeting of the Meteoritical
Society, abstract no. 5170.
Webb S., Neal C. R., Gawronska
A., and Day J. M. D. (2019) Crystal size distribution patterns for lunar meteorites
Northwest Africa 12008, 4898, 8632, 3136 and three LaPaz Icefield lunar
meteorites. 50th Lunar and Planetary
Science Conference, abstract no. 2686.
Yokoi N., Takenouchi
A., and Mikouchi T. (2018) Iron valence states of plagioclase in some lunar meteorites.
49th Lunar and Planetary Science Conference, abstract no. 2227.
Zeigler R. A., Korotev R. L.,
Irving A. J., Jolliff B. L., Kuehner S. M., and Hupé
A. C. (2006) Petrography and composition of lunar basaltic meteorite NWA
3160. Lunar and
Planetary Science XXVII, abstract no. 1804.
Zeigler R. A., Korotev R. L.,
Jolliff B. L., Bunch T. E., and Irving A. J. (2006) Pairing relationships
among Northwest African basaltic lunar meteorites based on compositional
and petrographic characteristics. Antarctic Meteorites XXX, 125-126.
Zeigler R. A., Korotev R. L.,
Jolliff B. L., Bunch T. E., and Irving A. J. (2006) Pairing and petrogenetic relationships among basaltic lunar
meteorites from northwest Africa. 69th
Annual Meeting of the Meteoritical Society, abstract no. 5235.
Zeigler R. A., Korotev R. L.,
and Jolliff B. L. (2007) Petrography, geochemistry, and pairing relationships of
basaltic lunar meteorite stones NWA 773, NWA 2700, NWA 2727, NWA 2977, and
NWA 3160. Lunar and
Planetary Science XXXVIII, abstract no. 2109.
Zhang A. and Hsu W. (2008) Mineralogical and Raman spectroscopic studies of
Northwestern Africa 2977 lunar meteorite. 71st Annual Meeting of the
Meteoritical Society, abstract no. 5122.
Zhang A. C., Taylor L. A.,
Hsu W. B., Floss C., Li X. H., and Liu Y. (2010) Petrogenesis of lunar meteorite Northwestern Africa 2977:
Rare earth element geochemistry and baddeleyite Pb/Pb dating. 41st
Lunar and Planetary Science Conference, abstract no. 1052.
Zhang A.-C., Hsu W.-B., Floss
C., Li X.-H., Qiu-Li Li, Liu Y. and Taylor L. A.
(2010) Petrogenesis of lunar meteorite
Northwest Africa 2977: Constraints from in situ microprobe results.
Meteoritics and Planetary Science 45, 1929-1947.
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