地质学报2018，Vol.92Issue(6)：1131-1148,18.
甘蒙北山地区海相二叠系时代及其区域对比
Chronostratigraphy and Regional Comparison of Marine Permian System in the Beishan Region, North China
摘要
Abstract
Marine Permian system in the Beishan Region,North China is one of the youngest sequences in the Central Asian Orogenic Belt.But its precision time has not been constrained due to lacking high-resolution isotopic age data.This study obtained four LA-ICP-MS zircon U-Pb ages for the volcanic rocks from the Shuangbutang Formation,285.7±2.9 Ma,280.9±2.8 Ma,279.2±4.8 Ma and 272.7±2.6 Ma.Isotopic and paleontological evidence indicates that the marine Permian in the Beishan region ranges from Artinskian to Capitanian (286～265Ma),with the Shuangbotang,J ushitan and Jinta formations occurring in Artinskian,Wordian and Capitanian,respectively.Regional comparison shows that the marine deposition in the northern Xinjiang region ceased before the Kungurian(＞288 Ma)of early Permian,while the marine deposition in the Beishan and ancient Inner Mongolian regions continued until the Capitanian (265 Ma).关键词
北山/海相二叠系/LA-ICP-MS锆石U-Pb年龄/生物地层/年代地层Key words
Beishan/marine Permian/LA-ICP-MS zircon U-Pb age/biostratigraphy/chronostratigraphy引用本文复制引用
牛亚卓,卢进才,刘池阳,宋博,史冀忠,许伟..甘蒙北山地区海相二叠系时代及其区域对比[J].地质学报,2018,92(6):1131-1148,18.基金项目
本文为国家自然科学基金项目(编号41402097和41402195)和中国地质调查局矿产资源调查评价专项(编号DD20160172)资助成果. （编号41402097和41402195）
