湘南黄沙寺铷多金属矿区花岗斑岩锆石U-Pb定年、Hf同位素组成及其找矿指示意义  

Zircon LA-ICP-MS U-Pb dating,Lu-Hf isotopes composition and its prospecting significance of the granite porphyry from the Huangshasi rubidium deposit,southern Hunan Province

作　　者：周念峰 张遵遵 卢友月[2,3] 夏杰 杨奇荻[2,3] 付建明 ZHOU Nianfeng;ZHANG Zunzun;LU Youyue;XIA Jie;YANG Qidi;FU Jianming(Mineral Resources Investigation Institute of Hunan Province,Chenzhou 423000,Hunan,China;Wuhan Centre of China Geological Survey(Central South China Innovation Center for Geosciences),Wuhan 430205,Hubei,China;Institute of Granitic Diagenesis and Metallogeny,China Geological Survey,Wuhan 430205,Hubei,China)

机构地区：[1]湖南省矿产资源调查所,湖南郴州423000 [2]中国地质调查局武汉地质调查中心(中南地质科技创新中心),湖北武汉430205 [3]中国地质调查局花岗岩成岩成矿地质研究中心,湖北武汉430205

出　　处：《矿产勘查》2025年第1期82-91,共10页Mineral Exploration

基　　金：中国地质调查局地质矿产调查评价专项项目(DD20230342、DD20190154)联合资助。

摘　　要：湘南黄沙寺铷矿床位于南岭成矿带中段北缘,铷矿体主要赋存于花岗斑岩中。花岗斑岩锆石LA-ICP-MS U-Pb测年结果为(87.7±0.7)Ma(95%置信度,MSWD=4.6),显示其为华南燕山晚期构造-岩浆活动产物;锆石Hf同位素分析显示:ε_(Hf)(t)值为-3.7~-7.0,两阶段模式年龄为1408~1223 Ma,暗示花岗斑岩岩浆可能主要来源于中元古界下地壳物质重熔。近年来研究表明,湘南地区上堡、拖碧塘、界牌岭等燕山晚期小岩体均与锂铷多金属成矿密切相关,加强它们之间成岩成矿作用关系研究,对进一步认识区域燕山晚期成岩成矿地质背景,开展区域锂铷等战略性矿产勘查具有指导意义。The Huangshasi rubidium deposit is located in the north margin of Nanling metallogenic belt,south⁃ern Hunan Province.The rubidium ore bodies mainly occur in the granite porphyry.The results show that the age of granite porphyry is(87.7±0.7)Ma(95%confidence,MSWD=4.6),which was the product of the Late Yanshanian tec⁃tonic magmatic activity in South China;The ε_(Hf)(t)values and two stage Hf model ages of the Huangshasi mineralized granite porphyry are-3.7~-7.0 and 1408-1223 Ma,respectively.Suggesting that granite porphyry magma derived mainly from the remelting of Proterozoic crust.In recent years,research has shown that small rock bodies in the Late Yanshan period,such as Shangbao,Tuobitang,and Jiepailing in southern Hunan,are closely related to lithium rubidium polymetallic mineralization.Strengthening the study of their diagenetic and ore-forming relationships has guiding significance for further understanding the geological background of the late Yanshan diagenesis and miner⁃alization in the region and conducting strategic mineral exploration of lithium rubidium and other minerals in the re⁃gion.

关 键 词：锆石LA-ICP-MS U-Pb年龄 LU-HF同位素 花岗斑岩 铷矿 黄沙寺 湘南 

分 类 号：P597.3[天文地球—地球化学] P618.2[天文地球—地质学]