岩矿测试2024，Vol.43Issue(6)：880-891,12.DOI:10.15898/j.ykcs.202402290025
湖南永州老寨岭铜锡矿床锡石LA-MC-ICP-MS U-Pb定年研究
Cassiterite U-Pb Dating with LA-MC-ICP-MS of the Laozhailing Cu-Sn Deposit,Yongzhou City,Hunan Province
摘要
Abstract
Cassiterite is an important ore mineral in tin polymetallic deposits.Using cassiterite for dating tin polymetallic deposits has become one of the most direct methods to obtain the mineralization age of the deposits.However,due to the low uranium content and high common lead characteristics of cassiterite,the main problems and technical difficulties of the in situ U-Pb dating method for cassiterite lie in the development of ideal standards and the accuracy of common lead correction.The mineralization age of the Laozhailing Cu-Sn deposit in Yongzhou City,Hunan Province is constrained here by optimizing the technology.The Laozhailing Cu-Sn deposit is a vein-type tin polymetallic deposit,which is mainly composed of tin-quartz veins,cataclastic greisenized granite,and greisen.Three samples,16LZ01,16LZ02,and 16LZ03,were obtained with Tera-Wasserburg U-Pb lower intersection ages of 222.0±1.5Ma(MSWD=1.6,n=37),220.5±3.5Ma(MSWD=2.9,n=28),and 225.0±1.6Ma(MSWD=1.3,n=31),respectively.These results indicate mineralization in the late Indosinian period.The mineralization of the Laozhailing Cu-Sn deposit is closely related to the magmatic hydrothermal activity of the Yangmingshan complex granites.The results of this study provide important chronological evidence for the magmatic hydrothermal origin of the Laozhailing Cu-Sn deposit.关键词
铜锡矿床/锡石U-Pb定年/LA-MC-ICP-MS/老寨岭/湖南Key words
Cu-Sn deposit/cassiterite U-Pb dating/LA-MC-ICP-MS/Laozhailing/Hunan分类
天文与地球科学引用本文复制引用
崔玉荣,杨君,涂家润,肖志斌,周红英,喻光明,崔敏利,刘玖芬..湖南永州老寨岭铜锡矿床锡石LA-MC-ICP-MS U-Pb定年研究[J].岩矿测试,2024,43(6):880-891,12.基金项目
中国地质调查局地质调查项目(DD20230471,DD20242769) （DD20230471,DD20242769）
国家自然科学基金青年基金项目(42103025) （42103025）
国家自然科学基金项目(41873066,42073055) （41873066,42073055）
