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Origin and implications of troilite-orthopyroxene intergrowths in the brecciated diogenite Northwest Africa 7183
Ai-Cheng Zhang;  Yi-Fan Bu;  Run-Lian Pang;  Naoya Sakamoto;  HisayoshiYurimoto;  Li-HuiChen;  Jian-Feng Gao;  De-Hong Du;  Xiao-Lei Wang;  Ru-Cheng Wang
2018
Source PublicationGeochimica et Cosmochimica Acta
Volume220Pages:125-145
Abstract

Troilite-orthopyroxene intergrowths are present as a common material in the brecciated diogenite Northwest Africa (NWA) 7183. In this study, we report on the petrographic, mineralogical, and rare earth element abundances of the troilite-orthopyroxene intergrowths to constrain their origin and assess their implications for the diverse petrogenesis of diogenites.

Two groups of troilite-orthopyroxene intergrowths with various grain sizes and mineral chemistry have been observed in NWA 7183. One group of intergrowths contains fine-grained (<5 μm) olivine and chromite as inclusions in orthopyroxene (10–20 μm in size). The other group, in which orthopyroxene is more fine-grained (<10 μm in size), is closely associated with coarse irregular olivine grains. The orthopyroxene grains in both groups of troilite-orthopyroxene intergrowths are depleted in Cr, Al, Ti, and Ca compared with diogenitic orthopyroxene. Based on the texture and mineral chemistry, we suggest that the two groups of troilite-orthopyroxene intergrowths formed via reactions between diogenitic olivine and S-rich vapors, probably at different temperatures. The fact that some of the intergrowths are included in diogenitic lithic clasts indicates that the formation of the host diogenite should postdate the formation of the majority of troilite-orthopyroxene intergrowths. This relationship further implies that not all of the diogenites are cumulates that directly crystallized from the Vestan magma ocean. Instead, they probably originated from partial melting and recrystallization of magma ocean cumulates. The replacement of olivine by troilite and orthopyroxene intergrowths can partly explain why the expected olivine-rich lithologies were not detected at the two south pole impact basins on Vesta.

KeywordOlivine Troilite-orthopyroxene Intergrowth S-rich Vapor Northwest Africa 7183 Diogenite Vesta
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8007
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China
2.Lunar and Planetary Science Institute, Nanjing University, Nanjing 210046, China
3.Isotope Imaging Laboratory, Creative Research Institution Sousei, Hokkaido University, Sapporo 001-0021, Japan
4.Department of Natural History Sciences, Hokkaido University, Sapporo 060-0810, Japan
5.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Recommended Citation
GB/T 7714
Ai-Cheng Zhang;Yi-Fan Bu;Run-Lian Pang;Naoya Sakamoto;HisayoshiYurimoto;Li-HuiChen;Jian-Feng Gao;De-Hong Du;Xiao-Lei Wang;Ru-Cheng Wang. Origin and implications of troilite-orthopyroxene intergrowths in the brecciated diogenite Northwest Africa 7183[J]. Geochimica et Cosmochimica Acta,2018,220:125-145.
APA Ai-Cheng Zhang;Yi-Fan Bu;Run-Lian Pang;Naoya Sakamoto;HisayoshiYurimoto;Li-HuiChen;Jian-Feng Gao;De-Hong Du;Xiao-Lei Wang;Ru-Cheng Wang.(2018).Origin and implications of troilite-orthopyroxene intergrowths in the brecciated diogenite Northwest Africa 7183.Geochimica et Cosmochimica Acta,220,125-145.
MLA Ai-Cheng Zhang;Yi-Fan Bu;Run-Lian Pang;Naoya Sakamoto;HisayoshiYurimoto;Li-HuiChen;Jian-Feng Gao;De-Hong Du;Xiao-Lei Wang;Ru-Cheng Wang."Origin and implications of troilite-orthopyroxene intergrowths in the brecciated diogenite Northwest Africa 7183".Geochimica et Cosmochimica Acta 220(2018):125-145.
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