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矿床地质  2009 

青海大场金矿床地质特征及成因探讨

Keywords: 地质学,造山型金矿,中成金矿化,浅成锑矿化,成矿模式,大场,青海

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Abstract:

青海大场金矿床位于北巴颜喀拉造山带的中段,为区域印支造山过程晚期Au-Sb成矿作用的产物。该矿床为具有层控性和受断裂构造、隐伏岩浆活动控制的金矿床。矿体主要呈脉状、似脉状和透镜状赋存于三叠系巴颜喀拉群砂岩板岩互层组内,并严格受断裂破碎带的控制。大场金矿床先后经历了金、锑2期矿化,矿化平均成矿深度分别为5.9km和6.9km,锑矿化深度略浅于金矿化。成矿流体总体属中温、较低盐度、低密度的CO2-H2O-N2-H2S-CH4±CO±有机碳氢化合物体系。该矿床与造山型金矿具有相似的地质地球化学特征,其金矿化属造山型金矿的中成矿化,其锑矿化为造山型金矿的浅成矿化。

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