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

查看全文 作　　者：Yang [1,2]Cheng;Qinghui [2]Xiao;Tingdong [2]Li;Liquan [3]Xu;Yuxu [4]Fan;Yan [1]Li;Lingjun [3]Guo;Jinli [3]Pang;Weiming [3]Yuan

机构地区：[1]Institute of Mineral Resources Research,China Metallurgical Geology Bureau,Beijing 101300,China;[2]Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China;[3]Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-Prospecting,Hohhot 010020,China;[4]General Prospecting Institute,China National Administration of Coal Geology,Beijing 100039,China

出　　处：《Journal of Earth Science》索引2021年第32卷第1期,共14页

基　　金：This study was financially supported by Inner Mongolia Autonomous Region Geological and Mineral Exploration Fund(Nos.2017-YS01 and 2020-YS01);the Project of the Institute of Mineral Resources,China Metallurgical Geology Bureau(No.CMGB202002). 摘　　要：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 Belt.Type 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 ridge.The 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 source.Type 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 melts.Type 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 ratios.Thus they were likely gen-erated in a normal island-arc setting.Therefore,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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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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