典型文献
Cretaceous Meteorite Impact-Induced Initial Subduction:Records of highly Siderophile Element Abundances and Re-Os Isotopes in Ophiolites
文献摘要：
Compiled global ophiolite data reveal that Cretaceous ophiolites exhibit broaden varia-tions in 187Re/188Os and 187Os/188Os values, increases in Re concentrations and thus Re/Os ratios in all pe-ridotites 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 187Os/188Os values, Re and Re/Os ratios, whereas the undifferentiated meteorite accounted for the increases in the PPGE/IPGE and decreased 187Os/188Os 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 ophi-olites. The remaining meteoritic and lithospheric fragments most likely sank deeper and were distribut-ed widely in the convecting mantle to produce the observed global compositional heterogeneities.
文献关键词：
中图分类号：
作者姓名：
Benxun Su
作者机构：
Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;University of Chinese Academy of Sciences,Beijing 100049,China
文献出处：
引用格式：
[1]Benxun Su-.Cretaceous Meteorite Impact-Induced Initial Subduction:Records of highly Siderophile Element Abundances and Re-Os Isotopes in Ophiolites)[J].地球科学学刊（英文版）,2022(06):1526-1534
A类：
Meteorite,Siderophile,Ophiolites,Compiled,ridotites,chromitites,ophi,meteoritic,distribut,convecting
B类：
Cretaceous,Impact,Induced,Initial,Subduction,Records,highly,Element,Abundances,Isotopes,global,data,reveal,that,ophiolites,exhibit,broaden,varia,187Re,188Os,187Os,values,increases,concentrations,thus,ratios,additional,increased,PPGE,IPGE,Pd,subgroup,platinum,element,Ir,dunites,relative,These,compositional,changes,which,mostly,formed,subduction,initiation,settings,cannot,be,attributed,solely,involvement,subducting,previously,subducted,crustal,materials,Here,author,proposes,model,induced,disruption,oceanic,lithosphere,asthenosphere,upwelling,edges,laterally,spreading,anomalies,High,pressure,temperature,conditions,during,impacts,caused,melting,meteorites,ambient,mantle,rocks,producing,hybrid,melts,containing,partially,melted,fragments,Crustal,contributed,elevated,whereas,undifferentiated,accounted,decreased,Shock,super,reduced,phases,were,likely,generated,by,this,process,subsequently,transported,into,newly,peridotites,future,remaining,lithospheric,sank,deeper,widely,produce,observed,heterogeneities
AB值：
0.539001
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