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地质论评  2012 

广东河台右旋韧性剪切带及其对金矿的控制

Keywords: 广东河台金矿,韧性剪切带,早侏罗世,糜棱岩化,右旋走滑

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Abstract:

广东河台金矿位于广东西部的广宁杂岩体之中,为典型的韧性剪切类型矿床。几何学、运动学分析表明,河台韧性剪切带具有右旋性质,陡倾(>60°),走向N60°~80°E,与含金矿脉产状近于一致,与区域性N45°E走向韧性剪切带明显不同,为两个N45°E走向的右旋走滑断裂带间派生的右旋伸展走滑构造带。糜棱岩中石英包裹体和多硅白云母温度压力分析表明,韧性变形发生于中等温度压力(300~500℃、0?3~0?6GPa)的绿片岩相条件下,适宜金矿成矿。糜棱岩中提取的多硅白云母获得了187~192Ma的40Ar/39Ar坪年龄,表明韧性剪切导致的糜棱岩化及金矿化可能发生于早侏罗世。区域构造对比分析显示,河台金矿右旋韧性剪切带可能是太平洋构造域早侏罗世开始阶段诱导的远程斜向应力场的产物。

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