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地质论评  2006 

广西大厂锡矿田侵入岩SHRIMP锆石U-Pb年龄及其意义

Keywords: SHRIMP锆石U-Pb年龄岩浆岩大厂锡多金属矿广西

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Abstract:

应用高精度SHRIMP锆石U-Pb方法对广西大厂锡矿田不同类型中―酸性侵入岩进行了系统的定年研究,获得龙箱盖含斑黑云母花岗岩的成岩年龄为93±1Ma,斑状花岗岩91±1Ma,石英闪长玢岩脉(西岩墙)91±1Ma,花岗斑岩脉(东岩墙)91±1Ma,四者在测试误差范围内基本一致,微量元素特征及稀土配分模式相近,为同期不同阶段岩浆活动的产物。区内成岩与锡多金属成矿的时代相一致,均形成于板内伸展剪切的构造环境,应同属燕山晚期构造―热事件的产物。

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