成都理工大学学报（自然科学版）2016，Vol.43Issue(6)：727-736,10.DOI:10.3969/j.issn.1671-9727.2016.06.11
川西须家河组火山岩夹层时代及其地质意义
Chronology of the pyroclastic layer from Xujiahe Formaton in the western Sichuan Basin and its geological significance
摘要
Abstract
Dating by LA-ICP-MS is carried out on the newly found interbed of pyroclastic rocks in the Upper Triassic Xujiahe Formation in the western Sichuan Basin.The U-Pb isotope measurement yields (214.7±1.6 )Ma age,indicating that the pyroclastic rock belongs to Norian age of the late Triassic.This age represents the volcanic eruptions during the Xujiahe Formation accumulation and indicates that the deposition might have stopped before the Rhaetian.The dated age of pyroclastic rocks not only provide important evidence for stratigraphic classification and correlation of the Xujiahe Formation in the western Sichuan Basin,but also provide evidence and age constraints for the evolution of the western Sichuan foreland basin and the closure of the paleo-Tethys ocean.The correlation of volcanic activity between the Sichuan Basin and its periphery indicates that there was one intense volcanic eruption in the western China in the Norian age (210 ~ 220 Ma)from the Qiangtang terrane to east Kunlun terrane.关键词
锆石 U-Pb 年龄/凝灰岩/须家河组/晚三叠世/四川盆地Key words
U-Pb chronology of zircon/tuff/Xujiahe Formation/Triassic/Sichuan Basin分类
天文与地球科学引用本文复制引用
冉波,刘树根,李智武,董军,王自剑,叶玥豪,田庆,黄瑞,何鲤..川西须家河组火山岩夹层时代及其地质意义[J].成都理工大学学报（自然科学版）,2016,43(6):727-736,10.基金项目
国家自然科学重点基金项目（41230313）；国家自然科学基金青年基金项目（41102064）。 （）
