云南泸水钨锡矿床微量钾矿物^（40）Ar－^（39）Ar马鞍形年龄谱的含义  

THE IMPLICATIONS OF 40_ Ar-39_Ar SADDLE-SHAPED AGE SPECTRA OF TRACE K MINERALS FROM THE LUSHUI TUNGSTEN-TIN DEPOSIT,YUNNAN PROVINCE

作　　者：邱华宁[1] 戴 谟 蒲志平[1] 

机构地区：[1]中国科学院广州地球化学研究所

出　　处：《矿床地质》1995年第3期273-280,共8页Mineral Deposits

基　　金：国家自然科学基金

摘　　要：采用４０＿Ａｒ－３９＿Ａｒ计时方法测定滇西沪水钨锡矿床的白云母、石英、电气石和绿柱石等矿物的年龄，其中微量Ｋ矿物（石英、电气石和绿柱石）均形成含过剩４０＿Ａｒ的马鞍形年龄谱。研究表明鞍形谱最小年龄的含义比较复杂，有些样品的最小年龄接近于成矿年龄，而有些样品的最小年龄大于甚至远大于成矿年龄。Ages of such minerals as muscovite quartz,tourmaline and beryl from the Lushui tungsten-tin deposit in western Yunnan were determined by40_ Ar-39_Ar method. The trace K minerals(quartz,tourmaline and beryl ) all form saddle-shaped age spectra of excess 40_Ar. Studies showthat implications of minimum ages of saddle-shaped spectra are rather complicated,with minimumages of some samples close to metallogenic ages whereas those of other samples older than or evenmuch older than metallogenic ages.

关 键 词：氩同位素 矿床年龄 钨矿床 钾矿物 

分 类 号：P618.670.4[天文地球—矿床学]