Exposure history, petrology, and shock-induced sulfidization reaction of Alatage Mountain 001 strewn field samples,Meteoritics and Planetary Science

当前位置： X-MOL 学术 › Meteorit. Planet. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Exposure history, petrology, and shock-induced sulfidization reaction of Alatage Mountain 001 strewn field samples
Meteoritics and Planetary Science ( IF 2.2 ) Pub Date : 2021-07-22 , DOI: 10.1111/maps.13710
Shijie Li _{1,

2} , Ingo Leya ₃ , Shijie Wang ₄ , Thomas Smith _{3,

5} , Huiming Bao _{6,

7} , Yan Fan _{1,

8} , Bing Mo _{1,

2} , Marc Caffee

Affiliation

Several hundred meteorites with a total mass of over 100 kg were collected as the Alatage Mountain (AM) strewn field located in the Kumtag desert, Xinjiang Province, China. Twelve AM meteorites were studied in this work. Petrography, mineralogy, bulk chemistry, bulk oxygen isotopic compositions, and light noble gas concentrations and isotopic compositions were determined for all or for a selection of the meteorites. The studied meteorites are L-chondrites that suffered a very strong impact; impact melt veins and melt pockets are widely distributed. More than 50% of the troilite exists in the form of blebs and veins in olivine and pyroxene. Some of these meteorites are impact melt recrystallized rocks (e.g., AM 037). The strong impact caused the decomposition of troilite, which led in AM 034 to the sulfidization reaction of olivine. The metal in most meteorites is almost completely altered, and the troilite has been significantly oxidized. Weathering resulted in the depletion of Mg, Fe, Co, and Ni, and the enrichment of Sr, Ba, Pb, and U in these meteorites. The cosmic ray exposure (CRE) ages measured for these specimens range between 6.2 ± 1.9 Ma and 9.0 ± 2.7 Ma, depending on the cosmogenic nuclide used. The average CRE age is 7.6 ± 1.3 Ma. Both ⁴He and ⁴⁰Ar gas retention ages indicate that the strong impact which caused the shock effects occurred about 320 Ma ago.

更新日期：2021-07-29

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南

全部期刊列表>>