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《Chinese Journal of Geophysics》 2009-10
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The electrical structure of Bangong-Nujiang suture:results from magnetotelluric sounding detection

JIN Sheng~1, WEI Wen-Bo~1, YE Gao-Feng~1, DENG Ming~1, TAN Han-Dong~1, Martyn Unsworth~21 Key Laboratory of Geo-detection (China University of Geosciences , Beijing, China),Ministry of Education ,School of Geophysics and In formation Technology,China University of Geosciences,Beijing 100083,China2 University of Alberta,Edmonton, Canada  
This paper discussed the features of electrical structure of Bangong-Nujiang tectonic belt and its adjacent zones based on three magnetotelluric sounding profiles which crossed Bangong-Nujiang suture. The results of MT detection show that discontinuous resistive bodies are widely distributed in the upper crust along the suture, which may indicate the features of magmatite distribution and the different magmatic activities in the northern and southern part of Bangong-Nujiang tectonic belt. High conductive bodies were detected in the middle and lower crust in Gangdisi and Qiangtang terrane. High conductive layer found in Gangdisi area to the south of Bangong-Nujiang tectonic belt may be the result of the Indian plate collision and underthrust;while the high resistive bodies underneath the high conductive bodies may be interpreted as the cold and rigid India continental crust that underthrusted northward. The electrical structure mode in Qiangtang terrane to the north of Bangong-Nujiang tectonic belt can be divided into two parts: the northern part and the southern part. The high conductive layer in the southern Qiangtang terrane crust is related with the Bangong-Nujiang tectonic belt resisting the India plate underthrust. Whereas the high conductive layer in the northern crust is connected with Asian continent s resistance against the northward underthrust of India plate and the southward underthrusting of Asian continent. The northward underthrusting of the India plate may not cross the Bangong-Nujiang tectonic belt. The underthrusting of the India plate is stopped by Bangong-Nujiang tectonic belt and Asian plate, and turns down into the asthenosphere, which resulted in mantle substance flowing up, hence a channel for heat exchange between crust and mantle near the suture is formed and high conductive bodies stretching to upper mantle in large scale exist. The electrical structure of Bangong-Nujiang tectonic belt suggests that the suture is a group of high angle, super deep fault in large scale.
【Fund】: 国家自然科学基金项目(4040406 40674045)资助
【CateGory Index】: P631.325
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