湘南桂汝地区青石岭和大岭背钨矿成矿时代及其找矿指示意义  

Minerallization ages and prospecting significance for Qingshiling and Dalingbei tungsten deposits in Guidong-Rucheng area,Southern Hunan

作　　者：卢友月[1,2] 付建明[1,2] 黎传标 程顺波[1,2] 陈希清[1,2] 马丽艳[1,2] LU You-yue;FU Jian-ming;LI Chuan-biao;CHENG Shun-bo;CHEN Xi-qing;MA Li-yan(Wuhan Centre of China Geological Survey,Wuhan 430205,China;Research Center of Granitic Diagenesis and Mineralization,China Geological Survey,Wuhan 430205,China;South Hunan Institute of Geological Survey,Chenzhou 423000,China)

机构地区：[1]中国地质调查局武汉地质调查中心,武汉430205 [2]中国地质调查局花岗岩成岩成矿地质研究中心,武汉430205 [3]湖南省湘南地质勘察院,湖南郴州423000

出　　处：《桂林理工大学学报》2018年第1期14-23,共10页Journal of Guilin University of Technology

基　　金：中国地质调查局地质矿产调查评价专项(121201009000150002;12120114084501);国家重点研发计划"深地资源勘查开采"重点专项(2016YFC0600205)

摘　　要：湘南桂汝地区沿诸广山复式花岗岩体西部及九峰岩体北部分布着大量钨多金属矿床(点),主要矿床类型有石英脉型、矽卡岩型、云英岩-石英脉型和破碎带蚀变岩型。采用石英流体包裹体Rb-Sr法和云母Ar-Ar法,分别获得青石岭钨矿含钨石英脉中石英矿物Rb-Sr同位素等时线年龄为157±7 Ma(MSWD=0.75),大岭背钨矿含钨云英岩-石英脉中铁锂云母40Ar-39Ar坪年龄为150±1 Ma,相应的等时线年龄为150±2 Ma(MSWD=0.71),反等时线年龄为150±2 Ma(MSWD=8.5)。它们同属于南岭成矿带燕山早期大规模成岩成矿作用高峰期的产物。A number of tungsten polymetallic ore deposits are located along the west of the Zhuguangshan composite pluton and the north of the Jiufeng pluton in Guidong-Rucheng area,Southern Hunan province.Four types of ore-body are found which are quartz vein type,skarn type,greisen-quartz vein type and fracture zone alteration rock type.In this study,Rb-Sr dating of quartz minerals from Qingshiling tungsten deposit yielded an isochron age of 157±7 Ma(MSWD=0.75),Ar-Ar dating of zinnwaldite from W bearing greisen-quartz vein in the Dalingbei tungsten deposit produced a plateau age of 150±1 Ma with an isochron age of 150±2 Ma(MSWD=0.71),and inverse isochron age of 150±2 Ma(MSWD=8.5).Our Rb-Sr and 40 Ar-39 Ar dating results show that Qingshiling and Dalingbei tungsten deposits were produced during the peak stage of large-scale rock-forming and ore-forming processes in the early Yanshanian in the Nanling Metallogenic belt.

关 键 词：钨矿床 Rb-Sr法 AR-AR法 青石岭 大岭背 桂东-汝城地区 湘南 

分 类 号：P618.67[天文地球—矿床学]