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您的检索式：作者名="Alan G.JONES"
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| 1 | Conductivity structure and rheological property of lithosphere in Southern Tibet inferred from super-broadband magnetotelluric sounding显示文摘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. | Martyn UNSWORTH Alan G.JONES | 2010 | Science China Earth Sciences2010，53，2： | 11 |
| 2 | Lithospheric Electrical Structure across the Eastern Segment of the Altyn Tagh Fault on the Northern Margin of the Tibetan Plateau显示文摘Project INDEPTH(Inter National DEep Profiling of Tibet and the Himalaya) is an interdisciplinary program designed to develop a better understanding of deep structures and mechanics of the Tibetan Plateau. As a component of magnetotelluric(MT) work in the 4th phase of the project, MT data were collected along a profile that crosses the eastern segment of the Altyn Tagh fault on the northern margin of the plateau. Time series data processing used robust algorithms to give high quality responses. Dimensionality analysis showed that 2D approach is only valid for the northern section of the profile. Consequently, 2D inversions were only conducted for the northern section, and 3D inversions were conducted on MT data from the whole profile. From the 2D inversion model, the eastern segment of the Altyn Tagh fault only appears as a crustal structure, which suggests accommodation of strike slip motion along the Altyn Tagh fault by thrusting within the Qilian block. A large-scale off-profile conductor within the mid-lower crust of the Qilian block was revealed from the 3D inversion model, which is probably correlated with the North Qaidam thrust belt. Furthermore, the unconnected conductors from the 3D inversion model indicate that deformations in the study area are generally localized. | ZHANG Letian YE Gaofeng JIN Sheng WEI Wenbo Martyn UNSWORTH Alan G.JONES JING Jianen DONG Hao XIE Chengliang Florian LE PAPE Jan VOZAR | 2015 | Acta Geologica Sinica(English Edition)2015，89，1： | 1 |
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