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| Grove Mountains 050212 | |||||||||||||||||
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| Basic information | Name: Grove Mountains 050212 This is an OFFICIAL meteorite name. Abbreviation: GRV 050212 Observed fall: No Year found: 2006 Country: Antarctica [Collected by Chinese Antarctic Research Expedition (CARE)] Mass:  12.3 g | ||||||||||||||||
| Classification history: |
This is 1 of 233 approved meteorites classified as Mesosiderite. [show all] Search for other: Mesosiderites, Metal-rich meteorites | ||||||||||||||||
| Comments: |
Approved 4 Mar 2008 Revised 4 Aug 2008: final writeup | ||||||||||||||||
| Writeup |
Writeup from MB 93:
Grove Mountains 050212 72°57'11''S, 75°13'58''E Grove Mountains, Antarctica Find: 8 January 2006 Mesosiderite History and Physical characteristics: The meteorite was found in a large moraine west to the middle segment of the Gale Escarpment in Grove Mountains by Y. Ju. It has a round shape with a small fraction of black fusion crust remaining. The meteorite weighs 0.96 g. Petrography: (Y. Lin, S. Hu, and L. Feng, IGGCAS) It contains 12.3 vol% of metallic Fe-Ni and is significantly weathered. The silicate part consists of various large fragments of pyroxenes, plagioclase and silica mineral, eucritic lithologies, and fine-grained matrix. All fragments of pigeonite and augite show exsolutions, while those of orthopyroxene rarely contain lamellae of Ca-rich pyroxene, but highly heterogeneous among grains and zoned with bright rims. The fine-grained matrix shows ophitic texture, consisting mainly of pigeonite and plagioclase with less abundant augite, silica and chromite. Minor phosphates occur mainly close to metals. Mineral compositions and Geochemistry: (Y. Lin, S. Hu, L. Xu, and L. Feng, IGGCAS). Plagioclase is rather homogeneous, with An95-99. The fragments of orthopyroxene are highly heterogeneous, with Fs contents of the cores varying from 18 mol% to 60 mol%. The FeO/MnO (in weight) = 29 ± 3. Low-Ca lamellae (Fs41-60Wo2-6) high-Ca lamellae (Fs21-28Wo40-42). Minor olivine (Fa67). Kamacite (Ni = 4.71-6.31 wt%; Cr = 0.65-0.75 wt%); taenite (Ni = 39.9-41.8 wt%); troilite has no detectable Cr by EPMA. Classification: Mesosiderite, significantly weathered. Type specimens: PRIC holds the main mass and a polished section. | ||||||||||||||||
| Data from: MB93 Table 6 Line 443: |
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| Institutions and collections |
PRIC: Polar Research Institute of China, 451 Jinqiao Road, Shanghai 200129, China; Website (institutional address; updated 9 Apr 2013) IGGCAS: Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China (institutional address; updated 16 Oct 2011) |
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| References: | Published in Meteoritical Bulletin, no. 93, MAPS 43, 571-632 (2008)
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Geography:
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Statistics: This is 1 of 43352 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||
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