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Three-dimensional electrical resistivity structure beneath the Cuonadong dome in the Northern Himalayas revealed by magnetotelluric data and its implication

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Science China Earth Sciences 2022年第8期65卷 1538-1553页

作者： Shuai XUE Zhanwu LU Wenhui LI Hongda LIANG Guangwen WANG Haiyan WANG Hongqiang LI Xin LI Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Institute of GeologyChinese Academy of Geological SciencesBeijing100037China Institute of Geophysical and Geochemical Exploration Chinese Academy of Geological SciencesLangfang065000China Chinese Academy of Geological Sciences Beijing100037China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China

The North Himalayan gneiss domes(NHGD),as one of the extensional structures widely distributed across the southern Tibetan Plateau,are an important window for studying post-collisional diastrophism and magmation as well as polymetallic ***,the deep mechanism for the formation of NHGD remains *** magnetotelluric(MT)method was adopted to study the deep structure of the Cuonadong dome in the Northern *** characteristics of the dome were explored by using the MT sounding curves and phase ***-dimensional(3D)MT inversion was performed to determine the electrical resistivity structure beneath the Cuonadong *** preferred 3D electrical resistivity model shows that an obvious low-resistivity anomaly develops beneath the Cuonadong dome which is overlaid by a high-resistivity body and surrounded by an apparent subcircular zone of low-resistivity *** integrated conductivity(longitudinal conductance)from depths of 1-20 km indicates that the average longitudinal conductance at the core of the Cuonadong dome is about 10,000 *** high-conductivity anomaly at the core is found to be analogous to that of lava,mainly resulting from the crustal partial melting,and the estimated melt content is 11.0-17.3%.The high conductance surrounding the dome reaches 20,000 S on average,which is mainly attributed to saline *** results in this study support that the Cuonadong dome experienced magmatic *** together with previous geological and geochemical studies,we suggest that under the east-west(E-W)extensional tectonic setting in southern Tibet,deep crustal partial melting constantly accumulated beneath the dome,and therefore the magmatic diapirism resulted in the formation of the Cuonadong *** addition,the MT results also indicate that the development of the Cuonadong dome provides abundant mineralizing fluids and the space for migration of metallogenic fluids for(rare-metal)polymetallic mineralization.

关键词： Cuonadong dome Magnetotelluric method North Himalayan gneiss domes magmatic diapirism Partial melting Extension

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