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Cretaceous Meteorite Impact-Induced Initial Subduction: Records of highly Siderophile Element Abundances and Re-Os Isotopes in Ophiolites

文献类型：期刊论文

作者Su, Benxun1,2
刊名JOURNAL OF EARTH SCIENCE
出版日期2022-10-19
页码9
关键词Re-Os isotopes ophiolites PGE meteorites subduction initiation oceanic lithosphere
ISSN号1674-487X
DOI10.1007/s12583-022-1734-x
英文摘要Compiled global ophiolite data reveal that Cretaceous ophiolites exhibit broaden variations in Re-187/Os-188 and Os-187/Os-188 values, increases in Re concentrations and thus Re/Os ratios in all peridotites and chromitites, and additional increased PPGE/IPGE (Pd-subgroup platinum-group element (PGE)/Ir-subgroup PGE) ratios in chromitites and dunites relative to pre-Cretaceous ophiolites. These compositional changes in Cretaceous ophiolites, which mostly formed in subduction initiation settings, cannot be attributed solely to involvement of subducting or previously subducted crustal materials. Here, the author proposes a Cretaceous meteorite impact model that led to impact- induced disruption of oceanic lithosphere, asthenosphere upwelling, subduction initiation at edges of laterally spreading anomalies. High-pressure and high-temperature conditions during the impacts caused melting of the meteorites and the ambient crustal and mantle rocks, producing hybrid melts containing partially un-melted fragments. Crustal materials contributed to the elevated Os-187/Os-188 values, Re and Re/Os ratios, whereas the undifferentiated meteorite accounted for the increases in the PPGE/IPGE and decreased Os-187/Os-188 ratios. Shock pressure and super-reduced phases were likely generated by this process and were subsequently transported into the newly formed mantle peridotites and chromitites of future ophiolites. The remaining meteoritic and lithospheric fragments most likely sank deeper and were distributed widely in the convecting mantle to produce the observed global compositional heterogeneities.
WOS关键词OCEANIC UPPER-MANTLE ; PODIFORM CHROMITITES ; CARBONATE PLATFORM ; DIAMOND-BEARING ; HIGH-PRESSURES ; CONSTRAINTS ; PERIDOTITES ; SILICATE ; LUOBUSA ; ORIGIN
资助项目National Natural Science Foundation of China[91755205] ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution[SKL-K202202] ; Youth Innovation Promotion Association, Chinese Academy of Sciences
WOS研究方向Geology
语种英语
WOS记录号WOS:000870090700001
出版者CHINA UNIV GEOSCIENCES, WUHAN
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/107774]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Su, Benxun
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Su, Benxun. Cretaceous Meteorite Impact-Induced Initial Subduction: Records of highly Siderophile Element Abundances and Re-Os Isotopes in Ophiolites[J]. JOURNAL OF EARTH SCIENCE,2022:9.
APA Su, Benxun.(2022).Cretaceous Meteorite Impact-Induced Initial Subduction: Records of highly Siderophile Element Abundances and Re-Os Isotopes in Ophiolites.JOURNAL OF EARTH SCIENCE,9.
MLA Su, Benxun."Cretaceous Meteorite Impact-Induced Initial Subduction: Records of highly Siderophile Element Abundances and Re-Os Isotopes in Ophiolites".JOURNAL OF EARTH SCIENCE (2022):9.

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来源：地质与地球物理研究所

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