岩石矿物学杂志2017，Vol.36Issue(2)：187-195,9.
内蒙古东乌旗泥盆纪塔尔巴格特组凝灰岩锆石U-Pb年龄及其地质意义
Zircon U-Pb age of the tuff from Devonian Tarbaget Formation in Dong Ujimqin Banner, Inner Mongolia, and its geological implication
摘要
Abstract
Dong Ujimqin Banner in Inner Mongolia is one of the most developed Devonian strata areas along the orogenic belt in northern China.Previous researchers determined the relative age of strata by fossils;however,there is no accurate isotopic age.In this paper,using LA-ICP-MS dating method,the authors determined zircon U-Pb ages of tuff interlayers in the upper part of Devonian Tarbaget Formation and acquired 206Pb/238U weighted average age of 380.8 ± 1.6 Ma(MSWD =2.7),indicating an early Late Devonian age.This provides accurate geochronological data for Devonian strata in this area.Combined with the data of the fossil assemblage,the authors determined the age of Tarbaget Formation,which is middle Devonian Givetian period-late Devonian Frasnian period.关键词
东乌珠穆沁旗/塔尔巴格特组/凝灰岩/锆石U-Pb年龄/晚泥盆世Key words
Dong Ujimqin Banner/Tarbaget Formation/tuff/zircon U-Pb dating/Late Devonian分类
天文与地球科学引用本文复制引用
李艳锋,牛文超,张天福,程银行,李敏,段连峰,王树庆..内蒙古东乌旗泥盆纪塔尔巴格特组凝灰岩锆石U-Pb年龄及其地质意义[J].岩石矿物学杂志,2017,36(2):187-195,9.基金项目
中国地质调查项目(1212011220446,121201006000150013)Project of China Geological Survey(1212011220446,121201006000150013) （1212011220446,121201006000150013）
