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桂西北丹池成矿带花岗岩地球化学特征及其构造环境

, PP. 306-313

Keywords: 花岗岩,地球化学,构造环境,丹池成矿带,桂西北

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Abstract:

丹池成矿带是我国重要的锡多金属矿业基地和著名的大厂超大型锡矿产出地。本文根据野外地质观察,结合同位素测年资料厘定了丹池成矿带内岩浆侵入期次。在研究不同岩石类型花岗岩地球化学特征的基础上,运用Al2O3―SiO2、TFeO/(TFeO+MgO)―SiO2、AFM、ACF图解以及Rb―Yb+Ta、Rb―Y+Nb、Ta―Yb和Nb―Y判别图,结合区域地质背景分析,对成矿带内花岗岩成岩构造环境进行了综合判别,进而对区内大规模成矿作用的构造环境和动力学背景进行了探讨。研究表明,区内燕山晚期花岗岩主体属后造山花岗岩类(POG型),最晚期的白岗岩为RRG+CEUG型,带内岩浆岩形成于后造山向板内环境的转化阶段,主体构造环境则为较稳定的区域拉张,岩体侵位时代代表了区内构造环境的转折时期,这种区域构造体制的转换是大规模成矿的有利动力学条件。

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