湖南省拖碧塘铷矿花岗斑岩锆石LA-ICP-MS U-Pb定年及其地质意义  

Zircon LA-ICP-MS U-Pb dating age of the granite porphyry inTuobitang rubidium deposit,Hunan Province and its geological implication

作　　者：夏九洲 马丽艳[2,3] 郭闯 罗华彪 卢友月[2,3] 程顺波[2,3] 张遵遵[2,3] 夏杰[2,3] XIA Jiuzhou;MA Liyan;GUO Chuang;LUO Huabiao;LU Youyue;CHENG Shunbo;ZHANG Zunzun;XIA Jie(Geological Team No.217 of Hunan Nonferrous Metals Geological Exploration Bureau,Hengyang 421009,Hunan,China;Wuhan Geological Survey Centre of China Geological Survey,Wuhan 430205,Hubei,China;Geological Research Institute of Granitic Diagenesis and Metallogeny,China Geological Survey,Wuhan 430205,Hubei,China)

机构地区：[1]湖南省有色地质勘查局二一七队,湖南衡阳421009 [2]中国地质调查局武汉地质调查中心,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：《矿产与地质》2020年第6期1104-1111,共8页Mineral Resources and Geology

基　　金：中国地质调查局地质矿产调查评价专项项目“南岭成矿带大义山—骑田岭锡矿地质调查”(DD20190154);国家自然科学基金“南岭西段西山含铁橄榄石长英质岩石的成因、演化及其地球动力学意义”(41902053)共同资助。

摘　　要：湖南省拖碧塘铷矿位于南岭成矿带中段北缘,铷矿主要赋存于花岗斑岩脉中,已圈定工业矿体5个,探获Rb2O资源量近5万吨,为超大型铷矿床。在详细的野外地质调查基础上,对与成矿关系密切的花岗斑岩开展锆石LA-ICP-MS U-Pb测年,获得其成岩年龄为(87.4±0.8)Ma(95%置信度,MSWD=0.14),为华南燕山晚期岩石圈大规模伸展作用的产物。加强对湘南地区拖碧塘、上堡、界牌岭等燕山晚期花岗岩及其相关矿床的对比研究,对进一步认识区域燕山晚期成岩成矿地质背景,指导下一步找矿具有重要意义。Tuobitang Rubidium deposit is located in the north margin of Nanling metallogenic belt,Hunan Province.The rubidium orebodies are mainly hosted in the granite porphyry,and five industrial ore bodies have been delineated,with mineral resources of 50000 t Rb2O.It is a super-large rubidium deposit.On the basis of the detailed field geological survey,zircon LA-ICP-MS U-Pb dating of the granite porphyry,which is closely related to mineralization,is carried out.The rock-forming age is(87.4±0.8)Ma(95%confidence,MSWD=0.14),which is the product of large-scale extension of late Yanshanian lithosphere in South China.It is of great significance to strengthen the comparative study of late Yanshanian granites and their related deposits in Tuobitang,Shangbao and Jiepailing areas in South Hunan Province to further understand the geological background of late Yanshanian diagenesis and mineralization and to guide the prospecting work in the future.

关 键 词：锆石LA-ICP-MS U-Pb年龄 花岗斑岩 铷矿 拖碧塘 湖南 

分 类 号：P597[天文地球—地球化学]