地质论评2018，Vol.64Issue(1)：203-212,10.DOI:10.16509/j.georeview.2018.01.015
阴山东部卓资地区白垩系白女羊盘组火山岩锆石LA-ICP-MS U-Pb年龄及其地质意义
LA-ICP-MS U-Pb Ages of the Zircons from the Volcanic Rocks in the Cretaceous Bainüyangpan Formation in Zhuozi Area, Eastern Yinshan Mountains, and Their Geological Significance
摘要
Abstract
A amount of volcanic rocks named Bainüyangpan Formation have been discovered in the Yinshan Mountains of the Inner Mongolian Plateau in the northern North China Craton.However,their formation age is ambiguous and debated,especially these in Zhuozi county,eastern Yinshan Mountains,have not even been reported before.The age of these volcanic rocks play a key role in establishing the stratigraphic sequence and understanding the stratigraphic correlation in Yinshan Mountains and Yanshan Mountains areas.We did detailed fieldwork on the volcanic rocks of the Bainüyangpan Formation in Zhuozi county,which are charactered by typical bimodal volcanic rocks association.And Zircons from the rhyolitic tuff are dated by LA-ICP-MS U-Pb method,which gave a weighted mean age of 136.9±0.8 Ma,representing the deposition age of the Bainüyangpan Formation.Compared with the previous data form published articles,we found that the age of the Bainüyangpan Formation volcanic rocks have evidently varied in both temporal and spatial,which should be two main period production of volcanic activities (approximately 137Ma and l l5Ma,respectively).And those volcanic strata did not show the regularity that their age were older in the west Yinshan Mountains and became younger in the east Yinshan Mountains which previously supposed.Besides,this paper compared the age of the Early Cretaceous volcanic strata distributed in the Yinshan Mountains and Yanshan Mountains regions.The Bainüyangpan Formation in the Zhuozi county and the Wulatezhongqi county correspond closely in age to the Zhangjiakou Formation in Yanshan Mountains,and the Bainüyangpan Formation in the Wuchuan county and the Guyang county was correlated to the Jiufotang Formation in the Yan-Liao area(Yanshan Mountains—Western Liaoning area).关键词
阴山地区/白女羊盘组/早白垩世/LA-ICP-MS/锆石U-Pb定年Key words
Yinshan Mountains/Bainnüangpan Formation, Cretaceous, Mesozoic/LA-ICP-MS/zircon U-Pb date引用本文复制引用
常泽光,李明泽,周瑞,刘燕海,聂鑫..阴山东部卓资地区白垩系白女羊盘组火山岩锆石LA-ICP-MS U-Pb年龄及其地质意义[J].地质论评,2018,64(1):203-212,10.基金项目
本文为内蒙古自治区地质勘查基金资助项目(编号:NMKD2015-27)的成果.We would like to express our thanks to Professor LIU Yongqing from China Academic of Geological Sciences and the anonymous reviewer for examining the manuscripts.We also indebted to manager HU Xiaoqun from Inner Mongolia nonferrous Geological Prospecting Bureau and HOU Haifeng from the Beijing Haonian Linghang Technology Co.,Ltd.for helping. （编号:NMKD2015-27）
