Proterozoic tectonothermal processes imaged with magnetotellurics and seismic reflection in southern Australia

作     者：Tom Wise Stephan Thiel Tom Wise;Stephan Thiel

作者机构：Geological Survey of South AustraliaDepartment for Energy and MiningAdelaideSA5005Australia School of Earth and Environmental SciencesUniversity of AdelaideAdelaideSA5005Australia 

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

年 卷 期：2020年第11卷第3期

页      面：885-893页

核心收录：

学科分类：070904[理学-构造地质学] 081801[工学-矿产普查与勘探] 081802[工学-地球探测与信息技术] 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] 08[工学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 0704[理学-天文学] 

基　　金：Eucla Gawler MT data Geological Survey of South Australia 

主　　题：Magnetotellurics Seismic reflection Resistivity 

摘      要：Over the last two decades,co-located seismic and magnetotelluric(MT) profiles provided fundamental geophysical data sets to image the Australian *** their complimentary nature,the data are processed and often interpreted separately without common processes in *** here qualitatively compare 2 D resistivity inversion models derived from MT and seismic reflection profiles across a region of Archean-Proterozoic Australia to address the causes of variations in seismic response and anomalous conductivity in the *** find that there exists a spatial association between regions of low reflectivity in seismic sections and low resistivity in co-located2 D MT modelled *** relationships elucidate possible signatures of past magmatic and fluid-related *** on their diffuse or discrete character,we hypothesize these signatures signify fossil melting of the crust due to mafic underplating,magma movement or hydrothermal fluid flow through the *** approach discussed herein is a process-oriented approach to interpretation of geophysical images and a significant extension to traditional geophysical methods which are primarily sensitive to a singular bulk rock property or state.