矿床地质2018，Vol.37Issue(2)：225-245,21.DOI:10.16111/j.0258-7106.2018.02.002
内蒙古道伦达坝铜钨锡矿床LA-ICP-MS锆石和锡石U-Pb年龄及其地质意义
LA-ICP-MS zircon and cassiterite U-Pb ages of Daolundaba copper-tungstentin deposit in Inner Mongolia and their geological significance
摘要
Abstract
The Daolundaba deposit,located in the southern Da Hinggan Mountains,is a medium-sized copper-tungstentin deposit.The orebodies in the deposit occur as veins in fractured zones mainly in the Permian sandy slate and subordinately in the Variscan biotite granite.Two cassiterite samples from the quartz-fluorite-muscovite-tourmaline-cassiterite-woframite stage of the Daolundaba deposit were selected for LA-ICP-MS cassiterite U-Pb dating,which yielded 207Pb/206Pb-238U/206Pb concordia ages of (134.7 ± 6.6) Ma (MSWD =1.4) and (136.8 ± 7.4) Ma (MSWD =1.7) as well as 206Pb/207Pb-238U/207Pb isochron ages of (132 ± 12) Ma (MSWD =0.76) and (135 ± 13) Ma (MSWD =0.9),respectively,indicating that the mineralization of the Daoluntangba Cu-W-Sn deposit took place in the Early Cretaceous.A zircon sample from the Zhangjiayingzi porphyritic fine-grained granite outside the mining area was selected for LA-ICP-MS zircon U-Pb dating,which yielded a weighted mean 206Pb/238U age of (135 ± 1) Ma (MSWD =1.3),indicating that the crystallization age of this granite is consistent with the metallogenic age of the Daolundaba deposit within the error.The dating results in this study show that the Daolundaba deposit was formed in the Early Cretaceous and was closely related to the granitic magmatism in the same period.The Daolundaba deposit belongs to the magmatic hydrothermal vein type deposit related to granite.关键词
地球化学/LA-ICP-MS锡石U-Pb定年/LA-ICP-MS锆石U-Pb定年/道伦达坝铜钨锡矿床/内蒙古/大兴安岭南段Key words
geochemistry/LA-ICP-MS cassiterite U-Pb dating/LA-ICP-MS zircon U-Pb dating/Daolundaba copper-tungsten-tin deposit/Inner Mongolia/southern Da Hinggan Mountains分类
天文与地球科学引用本文复制引用
陈公正,武广,李铁刚,刘瑞麟,武利文,章培春,张彤,陈毓川..内蒙古道伦达坝铜钨锡矿床LA-ICP-MS锆石和锡石U-Pb年龄及其地质意义[J].矿床地质,2018,37(2):225-245,21.基金项目
本文得到国家自然科学基金项目(编号:41772086)、内蒙古自治区地质勘查基金项目(编号:2015-01-YS01)和中国地质调查局中国矿产地质与成矿规律综合集成和服务(矿产地质志)项目(编号:DD20160346)资助 （编号:41772086）
