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Lunar
Meteorite
Sayh al
Uhaymir 449
Oman
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A slice of Sayh al Uhaymir
449 in the lab. Milliimeter ticks for scale.
Click on image for enlargement.
(photo
credit: Randy
Korotev)
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Our sample of Dhofar 925,
above, is compositionally indistinguishable from SaU 449.
(photo
credit: Randy Korotev)
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from
The
Meteoritical Bulletin, No. 93, Meteoritics
& Planetary Science 43,
571–632 (2007)
Sayh
al Uhaymir 449
Sultanate
of Oman
Find: 2006 March 19
Mass: 16.5 g
Lunar
(feldspathic impact melt breccia)
History: This
meteorite was found on a limestone plateau in the Dhofar desert of
Sultanate of Oman, far from any other known lunar meteorites.
Physical
characteristics: A single brownish to dark green stone
weighing 16.5 g, with no fusion crust.
Petrography:
(Ivanova M.A. and Nazarov M.A., Vernad)
The meteorite is a clast-rich impact melt breccia containing numerous
mineral fragments and lithic clasts embedded in a fine-grained impact-melt
matrix. The lithic clast population is dominated by impact-melt breccias of
anorthositic, gabbroic, and noritic compositions. The size range of the
clasts is 0.01-10 mm, and the main minerals are pyroxene, feldspar, and
minor olivine, silica, chromite, ilmenite, Ca-phosphate, troilite and FeNi
metal.
Mineral
compositions and geochemistry: (Ivanova M.A. and Kononkova N.N., Vernad.)
Feldspar (An93.4-97.4Ab2.5-9.2), clinopyroxene (En6.5-71.1Wo5.1-44.1;
Fe/Mn = 61), orthopyroxene (En53.2-79.5Wo3.3-4.7;
Fe/Mn = 59); olivine (Fo50.5-76.7; Fe/Mn = 96), ilmenite (MgO =
3.6 wt%). Average glassy matrix composition: SiO2 = 46.2, TiO2
= 0.33, Al2O3 = 25.6, FeO = 5.80, MgO = 4.85, CaO =
15.33, Na2O = 0.38 [all in wt.%].
Classification:
Lunar (feldspathic impact melt breccia); minor weathering, Fe hydroxides
are present.
Specimen:
A type specimen of 3.6 g and one thin section are on deposit at Vernad.
An anonymous finder holds the main mass of the meteorite.
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Randy
Says…
Compositionally
and texturally, it's just like Dhofar 925,
allegedly collected ~210 km to the south. That's probably too far apart for
the stones to be paired, unless the stones have or have been moved since
they fell.
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More
Information
Meteoritical
Bulletin Database
Sayh al
Uhaymir 449
Map
Schematic Map of the Find Locations of the
Dhofar Lunar Meteorites
References
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.
Joy K. H., Nemchin A., Grange M., Lapen
T. J., Peslier A. H., Ross D. K., Zolensky M. E., and Kring D.
A. (2014) Petrography, geochronology and source
terrain characteristics of lunar meteorites Dhofar 925, 961 and Sayh al
Uhaymir 449. Geochimica et
Cosmochimica Acta 144, 299-325.
Korochantseva E. V., Buikin
A. I., Hopp J., Korochantsev
A. V., and Trieloff M. (2016) 40Ar-39Ar results
of lunar meteorites Dhofar 025, 280, 309, 730, 733, 1436, 1442, SaU 449,
NWA 6888. 79th Annual Meeting of the Meteoritical Society,
abstract no. 6317.
Korotev R. L. (2011) Lunar meteorites from Antarctica and Oman. 74th Annual Meeting of the
Meteoritical Society, abstract no. 5073.
Korotev R. L. (2012) Lunar
meteorites from Oman. Meteoritics & Planetary Science 47, 1365-1402.
Korotev R. L. (2017) Update
(2012–2017) on lunar meteorites from Oman. Meteoritics
& Planetary Science 52,
1251-1256.
All Korotev data on Omani lunar meteorites.
Korotev R. L., Zeigler R. A.,
Irving A. J., and Bunch T. E. (2009) Keeping up with the Lunar Meteorites - 2009. 40th
Lunar and Planetary Science Conference, abstract no. 1137.
Korotev R. L, Zeigler R. A.,
Jolliff B. L., Irving A. J., and Bunch T. E. (2009) Compositional and lithological diversity among
brecciated lunar meteorites of intermediate iron composition. Meteoritics
& Planetary Science 44, 1287-1322.
Korotev R. L., Zeigler R. A.,
and Jolliff B. L. (2010) New geochemical constraints on pairing of the Dhofar 961
clan of lunar meteorites. 41st Lunar and Planetary
Science Conference, abstract no. 2126.
Nazarov M. A., Aranovich Ya.,
Demidova S. I., Ntaflos
T., and Brandstätter F. (2011) Aluminous enstatites of lunar meteorites
and deep-seated lunar rocks. Petrology 19, 13-25.
Zeigler R. A., Jolliff B. L.,
and Korotev R. L. (2010) Petrography and pairing relationships of lunar meteorites
Sayh al Uhaymir 449 and Dhofar 925, 960, and 961. 41st
Lunar and Planetary Science Conference, abstract no. 1985.
Zeigler R. A., Jolliff B. L.,
and Korotev R. L. (2013) Lunar meteorites Sayh al Uhaymir 449 and Dhofar 925, 960,
and 961: Windows into South Pole Aitken Basin?. 44th
Lunar and Planetary Science Conference, abstract no. 2437.
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