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Geochronology, geochemistry, and Sr-Nd isotopes of Early Carboniferous magmatism in southern West junggar, northwestern China: Implications for junggar oceanic plate subduction

引用

Journal of Arid Land 2021年第11期13卷 1163-1182页

作者： LIU Pengde LIU Xijun XIAO Wenjiao ZHANG Zhiguo SONG Yujia XIAO Yao LIU Lei HU Rongguo WANG Baohua Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration College of Earth SciencesGuilin University of TechnologyGuilin 541004China Xinjiang Research Center for Mineral Resources Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resource Guilin University of TechnologyGuilin 541004China

West junggar is a key area for understanding intra-oceanic plate subduction and the final closure of the junggar *** of the Carboniferous tectonic evolution of the junggar Ocean region is required for understanding the tectonic framework and accretionary processes in West junggar,Central Asian Orogenic Belt.A series of Early Carboniferous volcanic and intrusive rocks,namely,basaltic andesite,andesite,dacite,and diorite,occur in the Mayile area of southern West junggar,northwestern *** new LA-ICPMS zircon U-Pb geochronological data reveal that diorite intruded at 334(±1)Ma,and that basaltic andesite was erupted at 334(±4)*** intrusive and volcanic rocks are calc-alkaline,display moderate MgO(1.62%-4.18%)contents and Mg#values(40-59),and low Cr(14.5×10-6-47.2×10-6)and Ni(7.5×10-6-34.6×10-6)contents,and are characterized by enrichment in light rare-earth elements and large-ion lithophile elements and depletion in heavy rare-earth elements and high-field-strength elements,meaning that they belong to typical subduction-zone island-arc *** samples show low initial 87Sr/86Sr ratios(range of 0.703649-0.705008),positiveεNd(t)values(range of 4.8-6.2 and mean of 5.4),and young TDM Nd model ages ranging from 1016 to 616 Ma,indicating a magmatic origin from depleted mantle involving partial melting of 10%-25%garnet and spinel *** our results with those of previous studies,we suggest that these rocks were formed as a result of northwestward subduction of the junggar oceanic plate,which caused partial melting of sub-arc *** conclude that intra-oceanic arc magmatism was extensive in West junggar during the Early Carboniferous.

关键词： Early Carboniferous magmatism geochronology geochemistry junggar oceanic plate subdution West junggar Central Asian Orogenic Belt

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