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Eclogites in the interior of the Tibetan Plateau and their geodynamic implications

Chinese Science Bulletin 2009年第15期54卷 2556-2567页

作者： zhang kaijun1,2 & tang xianchun2,3.1 department of earth sciences, nanjing university, {4. 210093. China 2 Guangzhou Institute of Geochemistry, Chinese Academy of sciences, Guangzhou 51064., China 3 Graduate university of Chinese Academy of sciences, Beijing 10004., China department of earth sciences Nanjing University Nanjing 210093 China Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Graduate university of Chinese Academy of sciences Beijing 100049 China

Eclogites have been recently reported in the interior of the Tibetan Plateau, including in the central Qiangtang metamorphic belt, in the Basu metamorphic massif of the eastern Bangong-Nujiang suture zone, and at Songdo and Pengco in the eastern Lhasa terrane. Some typical ultrahigh-pressure (UHP) metamorphic phenomena, e.g., garnet exsolution from clinopyroxene, were documented in the Basu and Pengco eclogites. The UHP metamorphism in the interior of the Tibetan Plateau marked by these eclogites generally took place in the Early Mesozoic. Along with exhumation of these eclogites, (post-) collision-related magmatism extensively occurred around the central Qiangtang belt, the eastern Ban-gong-Nujiang suture zone, and the eastern Lhasa terrane. The occurrence of these Early Mesozoic ec-logites manifests an out-of-sequence evolution of the Tethys, and they could be a product of diachro-nous collision between the eastern Qiangtang terrane and the irregular continental margin of the united western Qiangtang-Lhasa plate, along the linked eastern Bangong-Nujiang-central Qiangtang zone. The collision-related magmatic rocks could have been originated from lithospheric thickening, melting, or detachment due to the collision. The presence of UHP metamorphic rocks in central Qiangtang and Basu implies likely continental deep-subduction, and the denudation of these two metamorphic zones could have served as the source of the Triassic turbidites in the Songpan-Garzê complex and the Ju-rassic turbidites in the western Bangong-Nujiang zone, respectively. However, studies of the eclogites in the interior of the Tibetan Plateau just began, and many principal aspects still remain to be explored, such as their distributions, typical lithologies and minerals, temperature-pressure conditions, timing of formation and exhumation, protoliths and tectonic setting, and relationship with the evolution of the Tethys and large-scale basins in Tibet.

关键词：地球动力学意义青藏高原榴辉岩

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Zircon SHRIMP U-Pb geochronology and petrogenesis of the plagiogranites from the Lagkor Lake ophiolite,Gerze,Tibet,China

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Chinese Science Bulletin 2007年第5期52卷 651-659页

作者： zhang YuXiu1,2, zhang kaijun1,3, LI Bing1,2, WANG Yang1,2, WEI QingGuo1,2 & tang {3.1,2 1 Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of {4., Guangzhou 51064., China 2 Graduate university, Chinese Academy of {4., Beijing 100039, China 3 department of earth {4., nanjing university, nanjing 210093. China Key Laboratory of Marginal Sea Geology Guangzhou Institute of GeochemistryChinese Academy of Sciences Guangzhou 510640 China

地关系与 petrographical 一起， petrological ，和 geochemicalcharacteristics ，和锆石人口，显示从在 Bangong-Nujiang 缝术地区的 Lagkor Lakeophiolite 的 plagiogranites (～ Gerze 县的 20 km 南方，中央西藏，中国)，由在海洋的外壳的运输期间的可锻的砍源于含水的斑粝岩的 anatexis 。因此，这种 plagiogranite 比传播海洋的外壳晚对或很少同时代。锆石虾 166 ±使 2.5 妈变老因为 plagiogranites 显示海洋的盆在中间的侏罗记在 Bangong-Nujiang 地区的西方的部分存在。

关键词：西藏改则县拉果错湖泊蛇绿岩斜长花岗岩锆SHRIMP U-Pb地质年代岩石成因

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4.Ar-39Ar Geochronology and Tectonic Implications of the Blueschist from Northwestern Qiangtang, Northern Tibet, Western China

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Acta Geologica Sinica(English Edition) 2012年第6期86卷 1471-1478页

作者： tang xianchun zhang kaijun Guangzhou Institute of Geochemistry Chinese Academy of Sciences Graduate university of Chinese Academy of sciences Research Institute of Petroleum Exploration and Development East China CompanySINOPEC Asian Tectonics Research Group Department of Earth SciencesNanjing University

Blueschist exposed in the northwestern Qiangtang terrane, northern Tibet, western China （84.30＇ E, 34.24. N）, provides new constraints on the tectonic evolution of Qiangtang as well as northern Tibet. The blueschist represented by lawsonite- and glaucophane-bearing assemblages equilibrated at 375-4.0 C and 11 kbar. 4.r-39Ar analysis on mineral separate from one blueschist sample yielded a well-defined plateau age of 24. Ma. Geochemical studies show the blueschist is metamorphosed within-plate basalts. The high pressure-low temperature blueschist indicates a Triassic event of lithosphere subduction, and clearly represents an extension of the central Qiangtang metamorphic belt, and defines an in situ suture between eastern and western Qiangtang.

关键词： blueschist high-pressure metamorphism 4.Ar-39Ar geochronology Qiangtang Tibet

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