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Magnetotelluric data reveals subduction polarity and reactivation of the Mudanjiang suture zone,Northeast China

Science China Earth Sciences 2023年第6期66卷 1309-1320页

作者： Zhonghua XIN Hesheng HOU Jiangtao HAN Lijia LIU Cai LIU Tianqi WANG College of Geoexploration Science and Technology Jilin UniversityChangchun 130026China Chinese Academy of Geological Science Beijing 100089China Key Laboratory of Applied Geophysics of Ministry of Natural Resources Changchun 130026China Changbai Mountain Volcano Comprehensive Geophysics Field Science Observation and Research Station of Ministry of Education Changchun 130026China

The Jiamusi and Songnen blocks converged in the easternmost segment of the Central Asian Orogenic Belt as a result of the subduction and subsequent closure of the Mudanjiang oceanic plate during the *** Mudanjiang suture zone was later directly affected by subductions of the Paleo-Pacific plate and Pacific plate and is therefore an ideal place to study the subduction polarity and later transformation of a paleo-suture *** three-dimensional inversion of magnetotelluric data collected along a 160-km-long profile across the Mudanjiang suture zone,we established a resistivity model of the suture zone and adjacent *** results reveal the subduction polarity and subduction trace of the Mudanjiang oceanic plate and provide geoelectrical evidence for reactivation of the Mudanjiang suture zone induced by the(Paleo-)Pacific plate *** suture zone shows a complex conductive *** west-dipping crustal-scale conductor beneath the Songnen-Jiamusi collision zone represents the fossil subduction zone and indicates the westward subduction polarity of the Mudanjiang oceanic ***,the Mudanjiang fault identified by surface geology does not fully represent the deep structure of the Mudanjiang suture *** definition of the suture zone should be extended to the whole conductive region with a lateral extent of~70 *** conductive minerals beneath the arc in front of the subduction zone were exhumated up from deep to the upper ***“chimney”-shaped conductor connected with the mantle represents the intrusive pathways of mantle-derived materials,suggesting that the Mudanjiang suture zone was reactivated by subductions of the Paleo-Pacific plate and Pacific plate,leading to remelting of the cooled and crystallized materials in the ***,subduction of the(Paleo-)Pacific plate destroyed the lithospheric structure of the paleo collision zone in the eastern segment of the Central Asian orogenic belt,and the large-s

关键词： Westward subduction of the Mudanjiang oceanic plate Reactivation of the Mudanjiang suture zone Subduction of the(Paleo-)Pacific plate Magnetotelluric method 3d electrical model

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