from The Meteoritical Bulletin, No. 111
Grove Mountains 150357 (GRV 150357)
Lunar meteorite (polymict breccia)
History: During 2015/2016 field season, this sample ([one among] 665 [meteorites] in total) was collected by the 32nd CHINARE in Grove Mountains, East Antarctica.
Physical Characteristics: A single stone. The fresh interior exhibits some lighter colored clasts within a dominant black matrix.
Petrography: Petrology (Z. Xia, B. Miao, GUT [College of Earth Sciences, Guilin University of Technology, China]): The polished thin section of this meteorite shows a distinct breccia texture, with many lithic clasts and mineral fragments embedded in the heterogeneous glassy matrix contaning fine-grained minerals. The lithic clasts includes crystalline impact melt, basalt, anorthosite, troctolite, norite/gabbro, symplectite (hedenbergite+fayalite+quartz), etc. Dominant mineral fragments are plagioclase, olivine and pyroxene. The pyroxene fragments with exsolution is common. Accessory phases are ilmenite, chromite, spinel, troilite and quartz.
Geochemistry: (Z. Xia, B. Miao, GUT): Heterogeneous glassy matrix: Al2O3: 12.5-28.77 wt% (avg. 22.4 wt%), MgO: 7.82-16.39 wt% (avg. 12.1 wt%), FeO:3.79-22.54 wt% (avg.14.3 wt%) (n=15). Plagioclase in basaltic clast: An92.5-94.3 (n=3). Plagioclase in anorthositic clast, An95.2-97.3 (n=7). Olivine fragments: Fo41.4-53.5 (Fe/Mn=77-94, n=13). Low-Ca pyroxene Fs32.7-48.9Wo1.9-14.9 (Fe/Mn=50-64, n=13) with exsolution lamellae of high-Ca?pyroxene Fs19.5-36.6Wo20.6-41.9 (Fe/Mn=45-59, n=9). Symplectite: hedenbergite Fs44.2Wo41.0; fayalite Fs89.1.
Classification: Lunar (polymict breccia).
Specimens: The main mass and one polished thin section are on deposited at Polar Research Institute of China.
This is the first lunar meteorite to be recognized among the Chinese collection from the Grove Mountains, Antarctica.
Meteoritical Bulletin DatabaseGrove Mountains 150357