caa a22 4500 445301066 CHVBK 20180317142558.0 cr unu---uuuuu 170323e20100201xx s 000 0 eng 10.1007/s11430-010-0001-7 doi (NATIONALLICENCE)springer-10.1007/s11430-010-0001-7 Conductivity structure and rheological property of lithosphere in Southern Tibet inferred from super-broadband magnetotelluric sounding [Elektronische Daten] [WenBo Wei, Sheng Jin, GaoFeng Ye, Ming Deng, JianEn Jing, Martyn Unsworth, Alan Jones] To understand deep lithosphere structure beneath the Qinghai-Tibet Plateau more comprehensively and objectively and to explore important scientific issues, such as characteristics of plateau lithospheric deformation, state of strain, thermal structure, plate (or terrane) movement, and crust-mantle rheology, it is necessary to research the variation of crust-mantle electrical structure in the east-west direction in every geological unit. For this purpose, six super-broadband magnetotelluric (MT) sounding profiles have been completed by INDEPTH-MT Project in the Himalayas-Southern Tibet. Based on the imaging results from the six profiles, three-dimensional electrical conductivity structure of the crust and upper mantle has been analyzed for the research area. The result shows that the high-conductivity layers in the middle and lower crust exist widely in Southern Tibet, which extend discontinuously for more than 1000 km in the east-west direction and become thinner, shallower and more resistive toward the big turning of the Yarlung Zangbo River. The discussion on the rheology of lithosphere in Southern Tibet suggests that the mid-lower crust there is of high electrical conductivity, implying the existence of "partial-melt” and "hot fluid” in the thick crust of Tibet, which make the medium hot, soft, and plastic, or even able to flow. Combining the experimental result of petrophysics and the MT data, we estimate the melting percentage of the crustal material to be up to 5%-14%, which would reduce the viscosity of aplite in the crust to meet the flow condition; but for granite, it is likely not enough to cause such a change in rheology. Science in China Press and Springer Berlin Heidelberg, 2010 Southern Tibet nationallicence super-broadband magnetotelluric sounding nationallicence crust nationallicence electrical conductivity nationallicence rheological property nationallicence Wei WenBo Key Laboratory of Geo-detection of Ministry of Education, 100083, Beijing, China aut Jin Sheng Key Laboratory of Geo-detection of Ministry of Education, 100083, Beijing, China aut Ye GaoFeng Key Laboratory of Geo-detection of Ministry of Education, 100083, Beijing, China aut Deng Ming Key Laboratory of Geo-detection of Ministry of Education, 100083, Beijing, China aut Jing JianEn Key Laboratory of Geo-detection of Ministry of Education, 100083, Beijing, China aut Unsworth Martyn Department of Physical, University of Alberta, T6G, 2J1, Edmonton, Alberta, Canada aut Jones Alan School of Cosmic Physics, Dublin Institute of Advanced Studies, 5 Merrion Square, Dublin 2, Ireland aut Science China Earth Sciences SP Science in China Press 53/2(2010-02-01), 189-202 1674-7313 53:2<189 2010 53 11430 https://doi.org/10.1007/s11430-010-0001-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11430-010-0001-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wei WenBo Key Laboratory of Geo-detection of Ministry of Education, 100083, Beijing, China aut NATIONALLICENCE 700 1- Jin Sheng Key Laboratory of Geo-detection of Ministry of Education, 100083, Beijing, China aut NATIONALLICENCE 700 1- Ye GaoFeng Key Laboratory of Geo-detection of Ministry of Education, 100083, Beijing, China aut NATIONALLICENCE 700 1- Deng Ming Key Laboratory of Geo-detection of Ministry of Education, 100083, Beijing, China aut NATIONALLICENCE 700 1- Jing JianEn Key Laboratory of Geo-detection of Ministry of Education, 100083, Beijing, China aut NATIONALLICENCE 700 1- Unsworth Martyn Department of Physical, University of Alberta, T6G, 2J1, Edmonton, Alberta, Canada aut NATIONALLICENCE 700 1- Jones Alan School of Cosmic Physics, Dublin Institute of Advanced Studies, 5 Merrion Square, Dublin 2, Ireland aut NATIONALLICENCE 773 0- Science China Earth Sciences SP Science in China Press 53/2(2010-02-01), 189-202 1674-7313 53:2<189 2010 53 11430 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer