Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1111/j.1945-5100.2000.tb01977.x |
Petrology and chemistry of the new shergottite Dar al Gani 476 | |
Zipfel, J; Scherer, P; Spettel, B; Dreibus, G; Schultz, L | |
通讯作者 | Zipfel, J |
来源期刊 | METEORITICS & PLANETARY SCIENCE
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ISSN | 0026-1114 |
出版年 | 2000 |
卷号 | 35期号:1页码:95-106 |
英文摘要 | In 1998, Dar al Gani (DaG) 476 was found in the Libyan desert. The meteorite is classified as a basaltic shergottite and is only the 13th martian meteorite known to date. It has a porphyritic texture consisting of a fine-grained groundmass and larger olivines. The groundmass consists of pyroxene and feldspathic glass. Minor phases are oxides and sulfides as well as phosphates. The presence of olivine, orthopyroxene, and chromite is a feature that DaG 476 has in common with lithology A of Elephant Moraine (EET) A79001. However, in Dac 476, these phases appear to be early phenocrysts rather than xenocrysts. Shock features, such as twinning, mosaicism, and impact-melt pockets, are ubiquitous. Terrestrial weathering was severe and led to formation of carbonate veins following grain boundaries and cracks. With a molar MSO/(MgO + FeO) of 0.68, DaG 476 is the most magnesian member among the basaltic shergottites. Compositions of augite and pigeonite and some of the bulk element concentrations are intermediate between those of Iherzolitic and basaltic shergottites. However, major elements, such as Fe and Ti. as well as LREE concentrations are considerably lower than in other shergottites. Noble gas concentrations are low and dominated by the mantle component previously found in Chassigny. A component, similar to that representing martian atmosphere, is virtually absent. The ejection age of 1.35 +/- 0.10 Ma is older than that of EETA79001 and could possibly mark a distinct ejection. |
类型 | Article |
语种 | 英语 |
国家 | Germany |
收录类别 | SCI-E |
WOS记录号 | WOS:000085160100014 |
WOS关键词 | ANTARCTIC SHERGOTTITE ; MARTIAN METEORITES ; NOBLE-GASES ; SNC METEORITES ; PETROGENESIS ; LEW88516 ; HISTORY ; ORIGIN ; MAGMA ; CRYSTALLIZATION |
WOS类目 | Geochemistry & Geophysics |
WOS研究方向 | Geochemistry & Geophysics |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/139601 |
作者单位 | (1)Max Planck Inst Chem, Abt Kosmochem, D-55020 Mainz, Germany |
推荐引用方式 GB/T 7714 | Zipfel, J,Scherer, P,Spettel, B,et al. Petrology and chemistry of the new shergottite Dar al Gani 476[J],2000,35(1):95-106. |
APA | Zipfel, J,Scherer, P,Spettel, B,Dreibus, G,&Schultz, L.(2000).Petrology and chemistry of the new shergottite Dar al Gani 476.METEORITICS & PLANETARY SCIENCE,35(1),95-106. |
MLA | Zipfel, J,et al."Petrology and chemistry of the new shergottite Dar al Gani 476".METEORITICS & PLANETARY SCIENCE 35.1(2000):95-106. |
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