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《Chinese Journal of Geophysics》 2015-08
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The study of gravity-magnetic anomaly and tectonic background in Sichuan west region

GAO Ling-Ju;ZHANG Jian;DONG Miao;Key Laboratory of Computational Geodynamics,Chinese Academy of Science;University of Chinese Academy of Science;  
The Western Sichuan Plateau,the eastern margin of the Tibetan Plateau,is the important part of the Sichuan-Yunnan rhombus block and the most intense tectonic deformation of the continental crust and high-seismicity region.The Batang earthquake zone,the Litang earthquake zone and the Kangding earthquake zone are related to the Jinsha River fault,the Litang fault and the Xianshui River fault respectively.Most of focal depth distributed in the upper crust of the Western Sichuan Plateau.The middle and deep crustal structure obviously related to the thermal abnormal process which revealed from the Curie isothermal surface undulation.The characteristics of gravity and magnetic anomalies,the Moho depth and the Curie isothermal depth in the Xianshui River fault,the Litang fault and the Jinsha River fault were studied.The analytical and inversion methods were used to the latest gravity and aeromagnetic data in the paper.The characteristic of Bouguer gravity anomalies of the Western Sichuan Plateau are higher in the southeast than in the northwest,showing a beads shaped.The band shaped magnetic field can be divided into three districts from west to east with Ganzi-Litang boundary:the strong changing district in Baiyu-Deqin,the quiet district in Ya River-Jiulong,the strongdistrict in Luding-Mianning.The Moho depth is shallower in the southeast and characterized with chair-step shape from the gravity inversion results.The crust thickness in the Western Sichuan Plateau varies from 43 to 63km and the average thickness is 55 km.The Curie isothermal surface depth ranges from 17 km to 23 km and with an average of 20 km.Xianshui River fault corresponding to the Moho surface gradient zone and the amplitude of the Curie isothermal surface trap.The Moho surface characterized with uplift and depression in the northern of Litang River fault,and uplift gradually in the southern.The Curie isothermal surface deepens from east to west.Along Jinsha River fault,the Curie isothermal surface shows local uplift,where the heat geothermal anomalies source maybe existing under this area.The two-dimensional inversion results of the Batang-Luding profile indicate the vertical crustal structure variant among different tectonic units.The Moho surface shows uplift and the minimum crust thickness is only 50 km in the 50 km to the east of Batang.The Moho depth below Litang is 60 km with a concave trend.The Curie isothermal surface shows weak variation and uplift gradually from west to east between22 km under Batang and 17 km under Luding.In general,the Curie isothermal surface in the Western Sichuan Plateau is in zoning distribution from north to south,which in accordance with the fault strike.The Curie isothermal surface shows ups and downs on either side of the fracture.The Moho depth gradually deepens from west to east,but the Curie isothermal surface above the Moho surface shows weak variation.We concluded that the Western Sichuan Plateau can be characterized with lower crust thickening,mid-crust thermal deforming and upper crust brittle deforming from comprehensive analytical approach.
【Fund】: 国家自然科学基金项目(41574074 41174085 41430319);; 中国科学院创新团队项目(KZZD-EW-TZ-19);; 中国科学院战略性先导科技专项(XDA1103010102)联合资助;; 中国地调局项目(12120113101400)资助
【CateGory Index】: P631
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