Damingshan is an important area of tungsten metal resources in southern China. The Datningshan tungsten deposit was tied up with the Yanshanian magmatism activity. Samples of tungsten veins and muscovite were determined by 40Ar/39Ar fast neutron activation techniques. The plateau age of muscovite is 97.10 ±0.86 Ma, with normal and inverse isochron ages being 96.6±1.7Ma and 96.5±1.1 Ma. The age of the sample is reliable. According to the results of the 40Ar/39Ar dating, the time limit of tungsten mineralization should be 97Ma, which indicates that the ore-forming epoch of the Damingshan ore deposit is late Yanshanian. The large-scale mineralization in the Damingshan metallogenic belt of Guangxi might be attributed to the Mesozoic lithospheric extension in southern China.%大明山钨矿床是一个与岩浆活动有关的多金属矿床.为确定钨矿床的成矿时代,对钨矿床中的白云母进行40Ar/39Ar快中子活化测年,获得白云母坪年龄为(97.10±0.86)Ma,相应的等时线年龄和反等时线年龄分别为(96.6±1.7)Ma和(96.5±1.1 )Ma.结果表明,钨矿矿化年龄为97Ma,为燕山晚期本区成岩成矿活动的产物.该成果为进一步认识大明山钨矿的成因机制和成矿动力学背景提供了新的年代学证据.
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