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Petrogenesis of Early Carboniferous Alkaline Basalt from the Wusun Mountain:Implications for Tectonic Evolution of the Western yining block,NW China

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Acta Geologica Sinica(English Edition) 2021年第4期95卷 1128-1138页

作者： WANG Zuopeng LV Yan LI Hai LI Yongjun ZHOU Yanlong LI Ganyu YANG Gaoxue School of Geological Engineering and Geomatics Chang'an UniversityXi'an 710054China School of Earth Science and Engineering Xi'an Shiyou UniversityXi'an 710054China School of Earth Science and Resources Chang'an UniversityXi'an 710054China Hebei GEO University Shijiazhuang 050031China

Late Paleozoic volcanic rocks are well exposed in the yining block,NW China,and are predominately composed of andesites,rhyolites and volcaniclastics as well as minor *** of the petrology,whole-rock geochemistry and zircon U-Pb dating for the Early Carboniferous alkaline basalts from Wusun Mountain,western yining block,constrains their petrogenesis and tectonic *** alkaline basalts consist mainly of plagioclases,mostly albite and labradorite,as well as clinopyroxenes and olivines;zircon U-Pb dating indicates their formation at ca.350 ***,the basaltic samples have low SiO_(2)contents,and high TiO_(2),Al_(2)O_(3)and alkaline contents,coupled with high Na_(2)O/K_(2)O ratios,displaying an alkaline basalt *** show remarkable LILE enrichment and HFSE ***,these samples have relatively high TFe_(2)O_(3),MgO,and Mg#values as well as Ni and Cr,relatively high Sm/Yb and U/Th,suggesting origination from a mantle source metasomatized by slab *** formed in a transitional tectonic setting from arc to intraplate,showing a typical affinity of back-arc basin *** alkaline basalts were likely generated in a nascent back-arc extension setting resulting from slab rollback of the southern Tianshan oceanic lithosphere.A bidirectional subduction model seems more reasonable for the evolution of the southern Tianshan *** new data will provide a new tectonic model for Late Paleozoic tectonic evolution of the western yining block.

关键词： petrology geochemistry isotopic dating alkaline basalt slab rollback yining block CAOB

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