地质通报Issue(11)：1715-1727,13.
藏北羌塘中部日湾茶卡组物源--LA-ICP-MS锆石U-Pb年龄及稀土元素特征
Riwanchaka Group in central Qiangtang Basin, the Tibetan Plateau:Evidence from detrital zircons. Geological Bulletin of China
摘要
Abstract
The Riwanchaka Formation (C1r), a set of carbonate and clastic early Carboniferous strata rich in warm-water fossils, is spread in the Gangmar Co-Riwanchaka area along the central Lungmu Co-Shuanghu-Lancang River suture zone nearly in east-west direction. An analysis of 120 age data of sandstone samples from the Riwanchaka Formation indicates that detrital zircon has six age ranges, which are 325~400Ma, 400~500Ma, 500~600Ma, 950~1100Ma, 1400~1800Ma and>1800Ma, and that the youngest detrital zircon age is 325Ma, which confirms its age of Early Carboniferous. Among these ages, peak ages of 362Ma and 454Ma are the most obvious. They reflect the tectonic magmatic events of the initial arc reduction stage in the Lungmu Co-Shuanghu-Lancang River Ocean and the Caledonian orogeny, implying that the provenance of the clastic rocks was probably the Yangtze Continent. In combination with the information of fossils, the authors hold that the Riwanchaka Formation (C 1r) should be Carboniferous sedimentary strata of Eurasia Yangtze type, belonging to the shallow water deposition in an island arc envir onment.关键词
青藏高原/羌塘/扬子型沉积/碎屑锆石/LA-ICP-MS锆石U-Pb年龄/加里东期运动Key words
Tibetan Plateau/Qiangtang/Yangtze type deposition/LA-ICP-MS zircon U-Pb dating/Caledonian movement分类
天文与地球科学引用本文复制引用
彭虎,李才,解超明,王明,江庆源,陈景文..藏北羌塘中部日湾茶卡组物源--LA-ICP-MS锆石U-Pb年龄及稀土元素特征[J].地质通报,2014,(11):1715-1727,13.基金项目
国家自然科学基金项目（批准号41272240、41072166）和中国地质调查局项目 （）
