Deep origin of Cenozoic volcanoes in Northeast China revealed by 3-D electrical structure

作     者：Shiwen LI Aihua WENG Jianping LI Xuanlong SHAN Jiangtao HAN Yu TANG Yanhui ZHANG Xueqiu WANG Shiwen LI;Aihua WENG;Jianping LI;Xuanlong SHAN;Jiangtao HAN;Yu TANG;Yanhui ZHANG;Xueqiu WANG

作者机构：College of Geo-exploration Sciences&TechnologyJilin UniversityChangchun 130026China Guangzhou Marine Geological SurveyChina Geological SurveyGuangzhou 510760China College of Earth SciencesJilin UniversityChangchun 130026China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2020年第63卷第4期

页      面：533-547页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 070801[理学-固体地球物理学] 0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 

基　　金：supported by the National Project for the Development of Major Scientific Instruments(Grant No.2011YQ05006010) 

主　　题：Northeast China Cenozoic volcanoes Three-dimensional magnetotelluric inversion Partial melting Upper mantle 

摘      要：The three-dimensional(3-D)electrical structure of the upper-mantle was used to examine the deep origins of and relationship among the Cenozoic volcanoes located in Northeast China(NEC).High-quality,long-period magnetotelluric(LMT)full-impedance tensor data were collected in NEC and subjected to 3-D Gauss-Newton inversion in order to construct a resistivity *** resulting model reveals the presence of multiple localized low-resistivity anomalies(LRAs)within the high resistivity lithosphere beneath *** LRAs partially coincide with Cenozoic volcanoes on the *** LRAs that form a larger,annular LRA were observed in the deep upper mantle beneath the Songliao Basin,whereas vein-like LRAs were found in the asthenosphere that connect the lithosphere and deep upper *** analyses suggest that the LRAs may have been caused by fluid-induced *** on our electrical model,we propose that,following dehydration of the subducted Western Pacific slab into the mantle transition zone(MTZ)beneath NEC,the released water migrated upward and caused partial melting at the top of the MTZ beneath the Songliao *** the effect of buoyancy,the melted mantle formed a thermal upwelling that caused melting of asthenosphere before diapiring at the base of the dry *** magma then penetrated structural boundaries(such as thinner,weaker,or activated suture zones)and finally reached the Earth s *** melting and upwelling of hot mantle materials may have resulted in large-scale volcanism in the region throughout the Cenozoic,including the eruption of Changbai Mountain and Halaha *** results suggest that the Cenozoic NEC volcanoes may all share a similar mode of genesis,and probably originated from the annular LRA in the deep upper mantle.