Paleocene–early Eocene post-subduction magmatism in Sikhote-Alin (Far East Russia): New constraints for the tectonic history of the Izanagi-Pacific ridge and the East Asian continental margin

作     者：Andrei V.Grebennikov Igor V.Kemkin Alexander I.Khanchuk Andrei V.Grebennikov;Igor V.Kemkin;Alexander I.Khanchuk

作者机构：Far East Geological InstituteFar Eastern BranchRussian Academy of Sciencespr.100-letiya Vladivostok 159Vladivostok 690022Russia Institute of Geology of Ore DepositsPetrographyMineralogy and Geochemistry(IGEM)Russian Academy of Sciences35 Staromonetny Per.Moscow 109017Russia 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2021年第12卷第4期

页      面：71-85页

核心收录：

学科分类：070904[理学-构造地质学] 070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 0704[理学-天文学] 

基　　金：by the Russian Foundation for Basic Research and the National Natural Science Foundation of China for scientific project No.19-55-53008 by the partial financial support of the Russian Foundation for Basic Research(No.19-05-00100) 

主　　题：Post-subduction magmatism Slab tear Sikhote-Alin Paleocene A-type rocks Izanagi-Pacific ridge 

摘      要：New isotopic,geochemical and geochronological data justify the widespread occurrence of middle Paleocene to early Eocene(60–53 Ma)post-subduction felsic magmatism across the entire Sikhote-Alin territory(southeastern Russia),conform with previous observations in Northeast China,the southern Korean Peninsula,and the Inner Zone of *** igneous activity in East Asia coincided with the reactivation(after tectonic quiescence between~93–60Ma)of left-lateral strike-slip displacements along the Tan-Lu and Central Sikhote-Alin faults and with the post-60 Ma cessation of subduction/accretion recorded in the Shimanto belt of SW *** Sikhote-Alin post-subduction igneous A-type rocks present diverse mineralogical and geochemical features that suggest interactions of the subducting plate with anhydrous mantle upwelling through slab tears in the continental *** middle Paleocene–early Eocene magmatismis not related to subduction but is synchronous with strikeslip tectonics and the termination of accretionary prism development,suggesting a shift in tectonic regime from oceanic plate subduction at a convergent margin to parallel sliding and initiation of a transformcontinental *** new observations are inconsistent with the current tectonic model of 60–50 Ma Izanagi-Pacific ridge subduction beneath East Asian continental margin.