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Lunar Meteorite: Dhofar 1180Oman |
Closeup of sawn face
of Dhofar 1180. (Photo courtesy of Michael
Farmer) |
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| Transmitted light photograph
of a thin section from Dhofar 1180 (Photo courtesy of Ted Bunch and Tony Irving) |
from The
Meteoritical Bulletin, 91, MAPS 42, 413-466 (2007)
Dhofar 118018°54'52'''N, 54°20'42''EDhofar, Oman Find: January 2005 Achondrite (lunar) History: M. Farmer recovered a specimen in the Dhofar region of Oman. Physical characteristics: The 115.2 g meteorite has an odd external shape akin to a thick-bladed talon. Petrography: (T. Bunch and J. Wittke, NAU) The sample is a feldspathic fragmental breccia that contains a variety of lithologies set in matrix of similar materials with a preferred orientation of fragments and clasts. Mostly ferroan anorthosites with clasts of gabbroic anorthosites, anorthositic gabbros and norites, troctolites, olivine gabbros, microporphyritic and fine-grained impact-melt breccias, and rare, ophitic/subophitic basalts and symplectites of unknown provenance. Mineral compositions and geochemistry: Anorthositic plagioclase (An94.5–98; FeO = 0.28–0.78 wt%); olivines (FeO/ MnO = 82–110), ferroan anorthosite (Fa38), norite (Fa18), olivine gabbro (Fa36.8); orthopyroxenes (FeO/MnO = 50–73), ferroan anorthosite (Fs38.6Wo2.1), olivine gabbro (Fs33.4Wo4.3), ophitic basalt core (Fs40Wo11.8) and rim (Fs69.1Wo15.8). Classification: Achondrite (lunar, feldspathic fragmental breccia). Minimal weathering. Type specimen: A 20.6 g sample is on deposit at NAU. Farmer and Strope hold the main mass. |
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