E&PS_WU_logo.jpg

 

Lunar Meteorite

Sayh al Uhaymir 169

Oman

 

Sayh al Uhaymir 169 in the desert

(photo credit: Beda Hofmann)

 

Sawn face of SaU 169. The lighter, bottom portion is the impact-melt lithology, the top is the regolith breccia lithology.

(photo credit: Natural History Museum Bern/Beda Hofmann)

 

Close-up of regolith breccia lithology on another sawn face.

(photo credit: Natural History Museum Bern/Peter Vollenweider)


Interface of impact-melt-breccia lithology (left) and regolith-breccia lithology (right). Millimeter ticks in background at bottom.

(photo credit: Randy Korotev)

 

from The Meteoritical Bulletin, No. 87, Meteoritics & Planetary Science 38, A189–A248 (2003)

Sayh al Uhaymir 169

Oman
Found: 2002 January 16
Mass: 206.45 g  

Lunar meteorite (KREEP-rich mafic impact melt breccia and adhering regolith) 

A complete, light grey-greenish rounded stone (70 x 43 x 40 mm) weighing 206.45 g was found in the Sayh al Uhaymir region of Oman.

Finders, mineralogy and classification: E. Gnos, B. A. Hofmann and A. Al-Kathiri (UniBern): Dark brown fusion crust is only locally preserved. The impact melt breccia (87 vol% of the stone, based on 8 X-ray tomographic sections) contains 25-40 vol% of strongly shocked magmatic rocks and crystal clasts (up to 17 mm) derived from norites, evolved magmatites, and granulites set in a fine-grained (<0.1 mm) crystalline matrix. Most crystal fragments are shocked plagioclases, locally associated with enstatite. In addition to plagioclase metallic iron, spinel, olivine, and orthopyroxene clasts are present. The fine-grained impact melt matrix consists mainly of short prismatic low-Ca pyroxene (En61-64,Wo2-4), interstitial plagioclase (An75-81) intergrown with potassium feldspar. The remaining minerals are poikilitic ilmenite, whitlockite, olivine (Fo58- 59), zircon, and traces of troilite, kamacite and tridymite. The regolith (13 vol.%) present one one side of the meteorite comprises crystalline and glassy volcanic rocks, magmatic lithic fragments, breccia fragments, fragments of mafic granulites, and crystal fragments. The impact melt breccia contains 32 ppm Th and 8.5 ppm U, 0.47% K (K/U= 553), indicating a lunar origin. This is further confirmed by fusion-crust Fe/Mn of 75.1 (microprobe, n=14) and impact melt bulk Fe/Mn of 79. Oxygen isotope composition (I. A. Franchi, OU) are also consistent with a lunar origin (Δ17O = 0.001 ± 0.032‰). This impact melt breccia is the most strongly KREEP enriched lithology among all known lunar rocks. Weathering: W1 (Fe metal shows only little oxidation).

Specimens: All in NMB.

 

Randy Says…

The meteorite is unique.

The impact-melt lithology has the greatest concentrations of geochemically incompatible elements (K, P, Zr, REE, Th, U, etc.) of any lunar meteorite or any other kind of meteorite. Concentrations of incompatible elements are very high even compared to Apollo samples.

It is the first meteorite for which the concentrations of naturally occurring thorium and uranium are so high that the radioactivity of the rock can be detected on a laboratory radiation survey meter ("Geiger counter"). [So as not to be too sensational, the radioactivity of most terrestrial granites and some other kinds of Earth rocks can also be detected with a radiation survey meter. Meteorites in general have less radioactivity than most Earth rocks.]

It is an unusual dilithologic meteorite (two main rock types in one rock).

It's the first lunar meteorite that must originate from the nearside feature known as the Procellarum KREEP Terrane.

 

More Information

Meteoritical Bulletin Database

Sayh al Uhaymir 169

Map

Schematic Map of the Find Locations of the Dhofar Lunar Meteorites

References

Al-Kathiri A., Hofmann B. A., Jull A. J. T., and Gnos E. (2005) Weathering of meteorites from Oman: Correlation of chemical and mineralogical weathering proxies with 14C terrestrial ages and the influence of soil chemistry. Meteoritics & Planetary Science 40, 1215–1239.

Al-Kathiri A., Gnos E. and Hofmann B. A. (2006) The regolith portion of the lunar meteorite Sayh al Uhaymir 169 (abstract). 69th Annual Meeting of the Meteoritical Society, abstract no. 5098.

Al-Kathiri A., Gnos E. and Hofmann B. A. (2007) The regolith portion of the lunar meteorite Sayh al Uhaymir 169. Meteoritics & Planetary Science 42, 2137-2152.

Cohen B. A. (2005) More impact-melt clasts in feldspathic lunar meteorites (abstract). 68th Annual Meeting of the Meteoritical Society, number 5314.

Cohen B. A. (2008) Lunar meteorite impact melt clasts and lessons learned for lunar surface sampling (abstract). In Lunar and Planetary Science XXXIX, abstract no. 2532, 39th Lunar and Planetary Science Conference.

Gnos E., Hofmann B. A., Al-Kathiri A., Lorenzetti S., Villa I., Eugster O., Jull A. J. T., Eikenberg J., Spettel B., Krähenbühl U., Franchi I. A., and Greenwood G. C. (2003) Lunar meteorite SaU 169; An extremely KREEP-rich rock, 66th Annual Meteoritical Society Meeting, no. 5066 (abstr.).

Gnos E., Hofmann B. A., Al-Kathiri A., Lorenzetti S., Eugster O., Whitehouse M. J., Villa I., Jull A. J. T., Eikenberg J., Spettel B., Krähenbühl U., Franchi I. A., and Greenwood G. C. (2004) Pinpointing the source of a lunar meteorite: Implications for the evolution of the Moon. Science 305, 657–659.

Gnos E., Hofmann B. A., Al-Kathiri A., and Whitehouse M. J. (2006) The KREEP-rich Imbrium impact melt breccia of the lunar meteorite Sayh al Uhaymir 169 (abstract). 69th Annual Meeting of the Meteoritical Society, abstract no. 5111.

Korotev R. L. (2004) A unique chunk of the Moon. Science 305, 622–623.

Korotev R. L. (2005) Lunar geochemistry as told by lunar meteorites. Chemie der Erde 65, 297–346.

Korotev R. L. (2011) Lunar meteorites from Antarctica and Oman (abstract). 74th Annual Meeting of the Meteoritical Society, abstract no. 5073.

Korotev R. L. (2012) Lunar meteorites from Oman. Meteoritics & Planetary Science 47, 1365–1402. doi: 10.1111/j.1945-5100.2012.01393.x

Korotev R. L. and Zeigler R. A. (2007) Keeping up with the lunar meteorites (abstract). In Lunar and Planetary Science XXXVIII, abstract no. 1340.

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.

Kramers J. D., Gnos E., Hofmann B. A., and al-Kathiri A. (2007) A ~4.3 Ga U-Pb age from lunar meteorite SaU169 and the chondritic Sm/Nd of the Moon (abstract). Goldschmidt Conference Abstracts 2007, A520.

Kuehner S. M., Irving A. J., Korotev R. L., Hupé G. M., and Ralew S. (2007) Zircon-baddeleyite-bearing silica+K-feldspar granophyric clasts in KREEPrich lunar breccias Northwest Africa 4472 and 4485 (abstract). In Lunar and Planetary Science XXXVIII, abstract no. 1516, 38th Lunar and Planetary Science Conference.

Lin Y., Shen W., Liu Y., Xu L., Hofmann B. A., Mao Q., Tang G., Wu F., and Li X. (2010) Very high-K KREEP-rich clasts in the impact melt breccia of the lunar meteorite SaU 169 — Possible pristine urKREEP sample (abstract). 73th Annual Meeting of the Meteoritical Society, abstract no. 5114.

Lin Y., Shen W., Liu Y., Xu L., Hofmann B. A., Mao Q., Tang G. Q., Wu F., and Li X. H. (2012) Very high-K KREEP-rich clasts in the impact melt breccia of the lunar meteorite SaU 169: New constraints on the last residue of the Lunar Magma Ocean. Geochimica et Cosmochimica Acta 85, 19-40.

Liu D., Wan Y., Zhang Y., Dong C., Jolliff B. L., Zeigler R. A., and Korotev R. L. (2009) Age of zircons in the impact-melt breccia in SaU 169 lunar meteorite: Beijing SHRIMP II study (abstract). In Lunar and Planetary Science XL, abstract no. 2499, 40th Lunar and Planetary Science Conference.

Liu D., Jolliff B. L., Zeigler R. A., Wan Y., Zhang Y., Dong C., and Korotev R. L. (2010) A 3.91 billion year age for Apollo 12 high-thorium impact-melt breccias: Products of Imbrium, or an older impact basin in the Procellarum KREEP terrane? (abstract). In Lunar and Planetary Science XLI, abstract no. 2477, 41st Lunar and Planetary Science Conference.

Liu D., Jolliff B. L., Zeigler R. A., Korotev R. L., Wan Y., Xie H., Zhang Y., Dong C., and Wang W. (2012) Comparative zircon U-Pb geochronology of impact melt breccias from Apollo 12 and lunar meteorite SaU 169, and the age of the Imbrium impact. Earth and Planetary Science Letters, 319-320, 277–286.

Lorenzetti S., Eugster O., Gnos E., Hofmann B. A., Al-Kathiri A., Villa I. and Jull A. J. T. (2003) Cosmic ray exposure history of the new Omani lunar meteorite Sayh al Uhaymir, 66th Annual Meteoritical Society Meeting, no. 5037 (abstr.).

Lorenzetti S., Busemann H., and Eugster O. (2005) Regolith history of lunar meteorites. Meteoritics & Planetary Science 40, 315-327.

Rankenburg K., Brandon A. D., and Neal C. R. (2006) Formation interval of the lunar mantle from high-precision Nd-isotope measurements of six lunar basalts (abstract). 69th Annual Meeting of the Meteoritical Society, abstract no. 5036. Lunar and Planetary Institute.

Rankenburg K., Brandon A. D., and Neal C. R. (2006) Neodymium isotope evidence for a chondritic composition of the Moon. Science 312, 1369-1372.

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 (abstract). 77th Annual Meeting of the Meteoritical Society, abstract no. 5085.

Xu L., Lin Y. T., Hofmann B. A., Gnos E., and Ouyang Z. Y. (2012) The origin of metal particles in lunar meteorites (abstract). 75th Annual Meeting of the Meteoritical Society, abstract no. 5247.

Zeigler R. A., Korotev R. L., and Jolliff B. L. (2006) Geochemistry and petrography of high-Th, mafic impact-melt breccia from Apollo 12 and Sayh al Uhaymir 169 (abstract). Lunar and Planetary Science XXVII, abstract no. 2366.

Zeigler R. A., Jolliff B. L., Korotev R. L., and Carpenter P. K. (2008) Determination of Sr concentrations in lunar plagioclase by electron microprobe analysis. Goldschmidt Conference Abstracts 2008, Geochimica et Cosmochimica Acta 72, 12S, p. 1072.

Zhou Q., Zeigler R. A., Yin Q.-Z., Korotev R. L., Joliff B. L., Amelin Y., Marti K., Wu F. Y., Li X. H., Li Q. L., Lin Y. T., Liu Y., and Tang G. Q. (2012) U-Pb dating of zircons and phosphates in lunar meteorites, acapulcoites and angrites (abstract). In Lunar and Planetary Science XLIII, abstract no. 1554, 43rd Lunar and Planetary Science Conference.

 

 

Back to: Lunar Meteorites | List of Lunar Meteorites | Top of Page

 


Prepared by
: Randy L. Korotev
 
Department of Earth and Planetary Sciences
Washington University in St. Louis

Please don't contact me about the meteorite you think you've found until you read this and this.


e-mail
korotev@wustl.edu

Last revised: 12-Oct-2015