云南泸水钨锡矿床微量钾矿物40Ar-39Ar马鞍形年龄谱的含义 |
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引用本文: | 邱华宁,戴撞谟,蒲志平. 云南泸水钨锡矿床微量钾矿物40Ar-39Ar马鞍形年龄谱的含义[J]. 矿床地质, 1995, 14(3): 273-280 |
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作者姓名: | 邱华宁 戴撞谟 蒲志平 |
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作者单位: | 中国科学院广州地球化学研究所 |
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基金项目: | 国家自然科学基金资助项目 |
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摘 要: | 采用40Ar-39Ar计时方法测定滇西泸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40Ar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。
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关 键 词: | 氩同位素 矿床年龄 钨矿床 钾矿物 |
The implications of 40Ar-39Ar saddle-shaped age spectra of trace K minerals from the Lushui tungsten-tin deposit, Yunnan Province |
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Abstract: | Ages of such minerals as muscovite, quartz, tourmaline and beryl from the Lushui tungsten-tin deposit in western Yunnan were determined by 40Ar-39Ar method. The trace K minerals (quartz, tourmaline and beryl) all form saddle-shaped age spectra of excess 40Ar. Studies show that implications of minimum ages of saddle-shaped spectra are rather complicated, with minimum ages of some samples close to metallogenic ages whereas those of other samples older than or even much older than metallogenic ages. |
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Keywords: | 40Ar-39Ar merhod saddle-shaped age spectrum age of ore deposit Yunnan |
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