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An Intra-Oceanic Subduction System Influenced by Ridge Subduction in the diyanmiao Subduction Accretionary Complex of the Xar Moron Area,Eastern Margin of the Central Asian Orogenic Belt

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Journal of Earth Science 2021年第1期32卷 253-266页

作者： Yang Cheng Qinghui Xiao Tingdong Li Liquan Xu Yuxu Fan Yan Li Lingjun Guo Jinli Pang Weiming Yuan Institute of Mineral Resources Research China Metallurgical Geology BureauBeijing 101300China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-Prospecting Hohhot 010020China General Prospecting Institute China National Administration of Coal GeologyBeijing 100039China

This study focuses on the geology,geochemistry,Sr-Nd isotopes and their tectonic settings of three types of basalts in diyanmiao ophiolite in the Xar Moron area located on the eastern margin of the Central Asian Orogenic *** I basalts are oceanic tholeiites with a depleted light rare earth element(LREE)pattern,which are similar to the typical N-mid-oceanic ridge basalt(MORB)and suggests that they were formed at a mid-oceanic *** initial 87Sr/86Sr ratios of Type I basalts range from 0.703966 to 0.705276 and theεNd(t)values are from 16.49 to 17.15,indicating that they were derived from a depleted mantle *** II basalts belong to the medium-potassium calc-akaline series and have the geochem-ical characteristics of Nb-enriched basalt(NEB)with high Nb content(14.5 ppm)and strong enrichment in LREEs,implying that they were created by the partial melting of mantle wedge peridotite that previously metasomatized by slab *** III basalts are high-Al basalt(HAB)with high-Al contents(Al_(2)0_(3)=16.75 wt.%-18.00 wt.%),distinct Nb depletion and high Th/Yb *** they were likely gen-erated in a normal island-arc ***,the association of MORB,NEB,and HAB in the study area may be due to the subduction of a mid-oceanic ridge,and the diyanmiao ophiolite is proposed to be formed in the forearc setting of a mid-oceanic ridge subduction system.

关键词： mid-oceanic ridge basalt Nb-enriched basalt high-Al basalt ridge subduction diyanmiao ophiolite Inner Mongolia

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