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《Seismology and Geology》 2013-04
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ISOSTATIC GRAVITY ANOMALY AND DENSITY STRUCTURE BENEATH POTASSIC VOLCANIC REGION IN NORTHERN TIBET

LIU Guo-cheng;QIN Zun-li;HE Ri-zhengInstitute of Geology,Chinese Academy of Geological Sciences;WU Yan-gang;College of Geo-Exploration Science and Technology,Jilin University;Institute of Geology,Chinese Academy of Geological Sciences;College of Information Engineering,Jilin Teachers' Institute of Engineering and Technology;HydroChina Beijing Engineering Corporation;  
This paper uses two techniques of isostatic correction and two-dimensional density fitting to analyze Bouguer gravity anomaly in Tibet,and obtains the regional and residual isostatic gravity anomaly in Tibet and two-dimensional density structure along 88. 5°E. The results show that the crust and upper mantle beneath northern Tibet are in a deficit state with a lower density than other regions in Tibet. Based on the existing data of regional geology,tectonics,geophysics and geochemical characteristics of magmatic rocks in the northern Tibet,those great eruptions of potassic volcanoes in northern Tibet are the result of break-off of the front of lithosphere mantle of Asia under on-going northward subduction of the Indian lithosphere mantle since ~ 65Ma.
【Fund】: 国土资源部公益行业基金(201011042 201011044);; 国家自然科学基金(40974060 40774051);; 中国地质科学院地质研究所基本科研基金(J1216)共同资助
【CateGory Index】: P312.4
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