桂东北水岩坝钨锡矿田白云母^(40)Ar-^(39)Ar年代学研究及其地质意义  

^(40)Ar-^(39)Ar Age of Muscovite in the Shuiyanba Tungsen-tin Ore Field in Northeast Guangxi and Its Geological Significance

作　　者：康志强[1,2] 冯佐海[2] 李晓峰[1] 廖家飞[2] 余勇[2] 潘会彬[2] 

机构地区：[1]中国科学院地球化学研究所,矿床地球化学国家重点实验室,贵阳550002 [2]桂林理工大学地球科学学院,广西隐伏金属矿产勘查重点实验室,桂林541004

出　　处：《矿物岩石地球化学通报》2012年第6期606-611,共6页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目(40772126;41003018);广西自然科学基金重点资助项目(2010GXNSFD013001);广西自然科学基金资助项目(2012GXNSFBA053132);广西教育厅资助项目(201010LX170)

摘　　要：水岩坝钨锡矿田位于桂东北姑婆山花岗岩体西南边缘,其成矿作用与姑婆山花岗岩体密切相关。为精确厘定其成矿年代,本文首次对烂头山矿床含钨石英脉中的白云母进行了40 Ar-39 Ar测年,获得白云母坪年龄为162.5±1.2 Ma,相应的等时线年龄为162.0±1.9Ma。表明其成矿年龄为162Ma左右,与姑婆山花岗岩体主体年龄一致,为燕山早期岩浆作用的产物。该成果为深入认识桂东北钨锡成矿年代学格架及成矿动力学背景提供了新的年代学证据。The Shuiyanba tungsen-tin ore field,which is closely connected with the Guposhan granites,locates in the southwest edge of the Guposhan granite intrusions,northeast Guangxi.This paper measured the 40Ar-39Ar age of muscovite in the tungsten bearing quartz veins of the Lantoushan ore deposit,and the results show a plateau age of 162.5±1.2 Ma and an isochron age of 162.0±1.9 Ma.The mineralization time（~162 Ma） is coeval with the age of Guposhan granites demonstrates that the mineralization is genetically associated with the Guposhan magmatic activities in the late Yanshanian.This study provides the new evidence for thoroughly understanding the chronology framework and kinetics background of Tungsen-tin ore deposits in northeast Guangxi.

关 键 词：白云母 40Ar-39Ar测年 钨锡矿田 烂头山 水岩坝 桂东北 

分 类 号：P597.3[天文地球—地球化学] P618.44[天文地球—地质学]