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Lunar Meteorite

Dhofar 1428

Oman

 

Dhofar 1428 in the desert

(photo credit: Michael Farmer)

 

Sawn slice of Dhofar 1428

(photo credit: Michael Farmer)

 

Chips of Dhofar 1428

(photo credit: Randy Korotev)

 

from The Meteoritical Bulletin, No. 91, Meteoritics & Planetary Science 42, A413–A466 (2007)

Dhofar 1428

Oman 
Find: March 2006

Achondrite (Lunar anorthositic breccia)

 

Physical characteristics: A 213 g dark gray stone with little remaining fusion crust found within the desert of the Dhofar regions of Oman.

Petrography
: (T. Bunch and J. Wittke, NAU) Clast-rich impact melt breccia (mingled) that consists mostly of light to dark gray clasts of previously formed, plagioclase-rich breccias and white lithic and mineral clasts of anorthositic rocks and plagioclase. Minor amounts of norites, anorthositic gabbros, troctolites, and ophitic/subophitic basalts were also observed. Groundmass is composed of quench-textured silicate melt (plagioclase, pyroxenes, opaque minerals and glass) and isolated pockets of vesicular glassy melt.

Geochemistry
: Anorthositic clast plagioclase (An93.8-98); Norite olivine (Fa36, FeO/MnO = 104), plagioclase (An96.4), orthopyroxene (Fs28.4Wo4.1, FeO/MnO = 51); Troctolite plagioclase (An95.5), olivine (Fa25.8, FeO/MnO = 89); Subophitic basalts that contain highly zoned pyroxenes (Fs14.9Wo5.1 to rims of Fs41.2Wo15.2).

Classification
: Achondrite (Lunar anorthositic breccia); Components shock levels range from moderate to completely melted and the degree of interior weathering is very low.

Specimens
: A 20.7 g type sample is on repository at NAU. Mr. R. Ward holds the main mass.

 

Randy Says…

Compositionally, Dhofar 1428 is a typical feldspathic lunar meteorite.

 

More Information

Meteoritical Bulletin Database

Dhofar 1428

Map

Schematic Map of the Find Locations of the Dhofar Lunar Meteorites

References

Bunch T. E., Wittke J. H., and Korotev R. L. (2006) Petrology and composition of lunar feldspathic breccias NWA 2995, Dhofar 1180 and Dhofar 1428 (abstract). 69th Annual Meeting of the Meteoritical Society, abstract no. 5254.

Hidaka Y., Yamaguchi A., and Ebihara M. (2009) Geochemistry and petrology of lunar meteorite Dhofar 1428 (abstract). 72th Annual Meeting of the Meteoritical Society, number 5329.

Hidaka Y., Yamaguchi A., and Ebihara M. (2010) Chemical compositions of lunar meteorite Dhofar 1428 (abstract). The 33rd Symposium on Antarctic Meteorites, Tokyo, 19-20.

Hidaka Y., Yamaguchi A., and Ebihara M. (2014) Lunar meteorite, Dhofar 1428: Feldspathic breccia containing KREEP and meteoritic components. Meteoritics & Planetary Science 49, 921-928. DOI: 10.1111/maps.12290

Hidaka Y., Yamaguchi A., and Ebihara M. (2010). Trace element characteristics of a lunar meteorite Dhofar 1428 (abstract 5308). Meteoritics and Planetary Science Supplement 45:A81.

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.

Liu Y. Zhang A. Taylor L. A. (2009) Fragments of asteroids in lunar rocks (abstract). 72th Annual Meeting of the Meteoritical Society, number 5434.

Miura Y.N., Okazaki R. and Yamaguchi A. (2012) Noble gas isotopic compositions of lunar meteorite, Dho 1428 (abstract). Fall meeting of The Japanese Society for Planetary Sciences, 2012. (in Japanese)

Xue Z, Xiao L., and Xu Y. (2017) Magnesian feldspathic crust and geochronology of evolved mare basalt in feldspathic lunar breccia meteorite Dhofar 1428. 48th Lunar and Planetary Science Conference, abstract no. 1952.

Zhang A. C., Hsu W. B., Liu Y., and Taylor L. A. (2009) Petrography and mineralogy of Dhofar 1428 lunar highland regolith breccia (abstract). 72th Annual Meeting of the Meteoritical Society, number 5096.

 

 

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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: 5-February-2017