中文摘要：

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。

英文摘要：

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.