| 华南某些含钨花岗岩的K-Ar年龄 |
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| 引用本文： | 穆治国,黄福生,卢德揆.华南某些含钨花岗岩的K-Ar年龄[J].岩石矿物学杂志,1988,7(2):109-117. |
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| 作者姓名： | 穆治国 黄福生 卢德揆 |
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| 作者单位： | 北京大学地质学系
(穆治国，黄福生)，江西省地矿局(卢德揆) |
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| 摘 要： | 测定了华南某些与钨矿床有关的花岗岩和钨矿脉样品的K—Ar年龄,共37件。这些花岗岩的表观年龄自183Ma至99.5Ma(年龄值为715Ma的岩体与钨矿无关),其中68％以上样品值域在150Ma左右。~(40)Ar/~(36)Ar—40K/~(36)Ar等时线图解给出的等时年龄为132.1Ma,说明这些花岗岩在形成时代上属中侏罗到早白垩世。我们发现在华南钨矿成矿域内,有一个从中心带向外年龄逐渐变青的趋势。用矿脉中和矿脉侧云英岩中云母类矿物所做的K—Ar定年得到的矿化作用的年龄,与各自相关的花岗岩的年龄非常接近,以至于很难用K—Ar定年法加以区别。即成矿作用和成岩作用有一种准同期性。等时线对应的~(40)Ar/~(36)Ar初始比高于现今大气Ar的比值,表明花岗岩在固结时有继承Ar存在。
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| 关 键 词： | 华南 含钨花岗石 K—Ar年龄 |
Potasslum-argon Ages of Some Tungsten-bearing Granites in South China |
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| Mu Zhiguo Huang Fusheng.Potasslum-argon Ages of Some Tungsten-bearing Granites in South China[J].Acta Petrologica Et Mineralogica,1988,7(2):109-117. |
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| Authors: | Mu Zhiguo Huang Fusheng |
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| Abstract: | Thirty-seven new K-Ar ages are reported for minerals from some veintype tungsten deposits and for igneous rocks in south China. The intrusion ages range from 183.1 Ma to 99.5 Ma(except one of 715.6 Ma), most of them about 150 Ma with isochron age of 132.1 Ma, placing them in early Jurassic to Cretaceous in age. The ages of the intrusions associated with tungsten mineralization are getting younger from the central part to the margines in the South China tungsten province. The mineralizations associated with these intrusions, dated by vein-mica, occurred so closely in time with the various intrusions, it cannot be meaningfully separated by K-At dating, although in most cases appears to be slightly younger. Mineralization is essentially penecontemporaneous with intrusion. As a result of that the initial ~(40)Ar/~(36)Ar ratio of intrusions is much higher than that ratio of present atmospheric argon, so it is suggested that there was excess of radiogenic argon in existence during the intrusions were formed. |
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| Keywords: | South China tungsten-bearing granite K-Ar age |
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