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金滩和白马山印支期花岗岩体LA-ICPMS锆石U-Pb定年及其成岩启示

, PP. 282-290

Keywords: LA-ICPMS锆石U?Pb年代学,印支期花岗岩,金滩,白马山

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Abstract:

对江西金滩和湖南白马山印支期花岗岩体高精度的LA?ICPMS锆石U?Pb年代学研究表明:金滩黑云母二长花岗岩体给出了(222.1±1.6)Ma的谐和年龄,属印支中晚期,而不是以往所认为的形成于海西期;白马山印支期的黑云母二长花岗岩和黑云母花岗闪长岩分别给出了(223.3±1.4)Ma、(204.5±2.2)Ma的谐和年龄。融合其他年代学数据,湖南白马山印支期花岗质岩浆可能经历了三期侵入活动:其中第一次侵入在印支早期(240Ma左右),其后又经历了220Ma左右和204Ma的另外两幕侵入活动。结合其他相关研究资料进一步表明220Ma左右华南内陆地区可能存在一次广泛的构造-岩浆活动。

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