地质通报2016，Vol.35Issue(11)：1845-1854,10.
藏东类乌齐地区辉长岩：冈瓦纳大陆北缘晚古生代裂解的记录
The gabbros from the Leiwuqi area, eastern Tibet:Records of the Late Paleozoic break-up of the northern Gondwana
摘要
Abstract
The Tibetan Plateau, which is located in the transitional zone of the Gondwana and Laurasia, plays a key role in studying the supercontinental convergence and cracking of Gondwana. As a result of the opening of the Tethys Oceans, the northern Gondwa⁃na started to rift during Late Paleozoic. Continental intraplate basaltic magmatism is typically considered to have been linked with con⁃tinental break-up. Permian continental intraplate basaltic rocks have been recognized in the Tibetan Plateau and are considered as re⁃cording the Late Paleozoic rift of the northern Gondwana. However, these rocks mainly occur in the Qiangtang and Panjal Traps of western Tibetan Plateau, but no coeval basaltic rocks have been reported in eastern Tibetan Plateau. In this paper the authors present the results of the study of the Early Permian gabbros in the Leiwuqi area of eastern Tibetan Plateau. LA-ICP-MS zircon U–Pb dat⁃ing reveals that the gabbros formed at 280±2Ma. The geochemical features of these gabbros are comparable with those of continental intraplate basalts (WPB). They exhibit positive values of zirconεHf(t) (5.1~11.5), suggesting a depleted mantle origin. Taking into ac⁃count previous data, the authors hold that these gabbros were related to the Early Permian Qiangtang-Panjal mantle plume. There⁃fore, Early Permian continental intraplate basaltic rocks developed in both western and eastern Tibetan Plateau and they were linked with the continental break-up of northern Gondwana and the opening of the Bangong Co-Nujiang Tethys ocean.关键词
藏东/辉长岩/锆石LA-ICP-MS定年/地球化学/大陆裂解Key words
eastern Tibet/gabbro/zircon LA-ICP-MS dating/geochemistry/continental break-up分类
天文与地球科学引用本文复制引用
胡培远,李才,翟庆国,王明,解超明,吴彦旺..藏东类乌齐地区辉长岩：冈瓦纳大陆北缘晚古生代裂解的记录[J].地质通报,2016,35(11):1845-1854,10.基金项目
国家自然科学基金项目（批准号41502216）、中国地质调查局项目（编号12120113093900）和中国地质科学院地质研究所基本科研业务费项目 （）
