地质通报2016，Vol.35Issue(6)：879-886,8.
松潘-甘孜褶皱带复理石火山岩夹层时代及其地质意义
Chronology of the volcanic rock intercalations within the flysch of the Songpan-Ganzi folded belt and its geological significance
摘要
Abstract
Several intercalations of volcanic and pyroclastic rocks were firstly discovered within the flysch of the Songpan-Ganzi folded belt. Samples were taken in northwestern Songpan of Sichuan and southwestern Hezuo of Gansu. Using U-Pb isotope mea⁃surement of LA-ICP-MS, the authors conducted dating of four samples and obtained ages of 205.9±1.6Ma, 208.9±1.8Ma, 210.4± 1.6Ma and 212.3 ± 1.5Ma separately, precisely showing the late Norian-early Rhaetian age of the Late Triassic. These are the age representatives of volcanic eruptions during the flysch accumulation and indicate that the deposition might have not stopped until the early Rhaetian. The discovery of the dated volcanic rocks would benefit the stratigraphic classification and correlation of the Up⁃per Triassic flysch within the Songpan-Ganzi folded belt, and can provide evidence and age constraints for the collision and oroge⁃ny between blocks of South and North China.关键词
锆石U-Pb年龄/安山岩/凝灰岩/复理石/晚三叠世/松潘-甘孜褶皱带Key words
U-Pb chronology of zircon/andesite/tuff/flysch/Late Triassic/Songpan-Ganzi folded belt分类
天文与地球科学引用本文复制引用
李祥辉,王成善,刘树根,冉波,徐文礼,周勇..松潘-甘孜褶皱带复理石火山岩夹层时代及其地质意义[J].地质通报,2016,35(6):879-886,8.基金项目
国家自然科学基金项目（批准号41072075）和中石化科技项目 （）
