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.
出处
《矿床地质》
CAS
CSCD
北大核心
1995年第3期273-280,共8页
Mineral Deposits
基金
国家自然科学基金
关键词
氩同位素
矿床年龄
钨矿床
钾矿物
Ar-39_Ar method,saddle-shaped age spectrum,age of ore deposit,Yunnan
