Journal ArticleDOI
Implications of crustal property variations for models of Tibetan plateau evolution
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TLDR
In this paper, shear-coupled teleseismic P waves sampling the interior of the Tibetan plateau provide evidence of systematic variations in crustal structure, suggesting that the crust of the northern plateau is partially melted due to high temperatures.Abstract:
Shear-coupled teleseismic P waves sampling the interior of the Tibetan plateau provide evidence of systematic variations in crustal structure. The crust thins by up to 20 km from south to north with a concomitant increase in Poisson's ratio from normal values in the south to unusually high values in the north. This suggests that the crust of the northern plateau is partially melted due to high temperatures. These changes imply spatial and perhaps temporal variations in the way the elevation of the high plateau is created and maintained.read more
Citations
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Journal ArticleDOI
Geologic Evolution of the Himalayan-Tibetan Orogen
An Yin,T. Mark Harrison +1 more
TL;DR: A review of the geologic history of the Himalayan-Tibetan orogen suggests that at least 1400 km of north-south shortening has been absorbed by the orogen since the onset of the Indo-Asian collision at about 70 Ma as discussed by the authors.
Journal ArticleDOI
Oblique Stepwise Rise and Growth of the Tibet Plateau
Paul Tapponnier,Xu Zhiqin,Françoise Roger,Bertrand Meyer,N. Arnaud,Gérard Wittlinger,Yang Jingsui +6 more
TL;DR: Two end member models of how the high elevations in Tibet formed are (i) continuous thickening and widespread viscous flow of the crust and mantle of the entire plateau and (ii) time-dependent, localized shear between coherent lithospheric blocks.
Journal ArticleDOI
Himalayan tectonics explained by extrusion of a low-viscosity crustal channel coupled to focused surface denudation
TL;DR: C coupled thermal–mechanical numerical models are used to show that these two processes—channel flow and ductile extrusion—may be dynamically linked through the effects of surface denudation focused at the edge of a plateau that is underlain by low-viscosity material.
Journal ArticleDOI
Tibetan tectonic evolution inferred from spatial and temporal variations in post-collisional magmatism
Sun-Lin Chung,Mei Fei Chu,Yuquan Zhang,Yingwen Xie,Ching-Hua Lo,Tung Yi Lee,Ching Ying Lan,Xian-Hua Li,Qi Zhang,Yizhao Wang +9 more
TL;DR: In this article, a geodynamic evolution model was proposed to depict when and how the Indian continental lithospheric mantle started thrusting under Asia by involving rollback and breakoff of the subducted Neo-Tethyan slab followed by removal of the thickened Lhasa root.
Journal ArticleDOI
Adakites from continental collision zones: Melting of thickened lower crust beneath southern Tibet
Sun-Lin Chung,Dunyi Liu,Jianqing Ji,Mei Fei Chu,Hao-Yang Lee,Da Jen Wen,Ching-Hua Lo,Tung Yi Lee,Qing Qian,Qi Zhang +9 more
TL;DR: In this paper, the authors reported the first example of such magmas from southern Tibet in an active continental collision environment, and their overall geochemical characteristics suggest an origin by melting of eclogites and/or garnet amphibolites in the lower part of thickened Tibetan crust.
References
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Journal ArticleDOI
Poisson's ratio and crustal seismology
TL;DR: In this paper, the authors used compressional and shear wave velocities to calculate Poisson's ratios for 678 rocks and found a linear correlation of increasing Poisson ratio with decreasing SiO2 content for rocks with 55 to 75 wt % SiO 2.
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Partially Molten Middle Crust Beneath Southern Tibet: Synthesis of Project INDEPTH Results
K. D. Nelson,Wenjin Zhao,Lawrence D. Brown,J. Kuo,Jinkai Che,Xianwen Liu,Simon L. Klemperer,Yizhaq Makovsky,Rolf Meissner,James Mechie,Rainer Kind,Friedemann Wenzel,James Ni,J. Nabelek,Chen Le-shou,Handong Tan,Wenbo Wei,Alan G. Jones,John R. Booker,Martyn Unsworth,William S.F. Kidd,M. Hauck,Douglas Alsdorf,A. Ross,M. Cogan,Changde Wu,Eric Sandvol,M. A. Edwards +27 more
TL;DR: The results suggest that during Neogene time the underthrusting Indian crust has acted as a plunger, displacing the molten middle crust to the north while at the same time contributing to this layer by melting and ductile flow.
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Lattice preferred orientation of olivine aggregates deformed in simple shear
Shuqing Zhang,Shun-ichiro Karato +1 more
TL;DR: In this article, the results of simple-shear deformation experiments on olivine aggregates, conducted at high temperatures and pressures (~1,500 K and 300 MPa), were described.
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Deep seismic reflection evidence for continental underthrusting beneath southern Tibet
TL;DR: In this paper, the authors used deep seismic reflection profiling to image the structure of the crust of the Tethyan Himalaya and found that the Indian plate is underthrusting southern Tibet.