甘肃寨上金矿带成矿动力环境分析与成矿作用探讨  

Discussion on the Metallogenic Dynamic Environment and Mineralization for Zhaishang Gold Belt in Gansu Province

作　　者：王伟峰[1] 刘新会[1] 赵淑芳[2] 向红林 刘爽[1] 

机构地区：[1]武警黄金第五支队,陕西西安710100 [2]西北有色地质研究院,陕西西安710054

出　　处：《黄金科学技术》2014年第5期18-24,共7页Gold Science and Technology

基　　金：中央基金项目"甘肃省岷县寨上金矿岩金普查"(编号:HJ20130201)资助

摘　　要：寨上金矿床为西秦岭岷礼盆地西部大型卡林—类卡林型金矿床。寨上金矿赋存在国营牛场背斜及斜切背斜的断裂中,赋矿地层为中—上泥盆统和下二叠统。南矿带矿脉主要受断裂控制,北矿带矿脉主要受层间剪切破碎带控制。矿（化）体沿砂岩、砂质板岩与碳质板岩的接触界面发育。矿区内发育少量石英闪长玢岩脉,且岩脉与金矿化关系密切。成矿流体具有中低温、低盐度和低密度特点。成矿主要集中在晚三叠—早侏罗世（220-170 Ma）、早白垩世（130-100 Ma）和早第三纪（60 Ma）3个地质时期,在喜山中晚期,可能叠加了新一期构造热液成矿作用。寨上金矿的形成具备3个条件,首先是浅源和深源成矿物质丰富,其次是物质迁移具有强动力来源,再次是物理化学条件的变化及容矿空间充裕是成矿的重要保证。因此,寨上金矿的形成是诸多成矿要素在相对局限的有利成矿构造域内,经过多期次叠加耦合的结果。Zhaishang gold deposit is a large Carlin and Carlin-like type gold deposit in the western part of the Min-Li basin,west Qinling Mountain.The gold deposit hosted in the Guoyingniuchang anticline and the fracture oblique anticline,the ore bearing strata are middle-upper Devonian and Lower Permain.The south ore belt is mainly controlled by faults,and the ore vein of north belt is mainly controlled by the interlayer shear zone.Mineralized bodies developed along the contact interface of sandstone,sandy slate and carbonaceous slate.We found a small amount of quartz diorite porphyrite veins in the mine,and the veins are closely associated with gold mineralization.The ore-forming fluid has the characteristics of low temperature,low salinity,low density.Mineralization is mainly concentrated in the Late Triassic-Early Jurassic（220-170 Ma）,Early Cretaceous（130-100 Ma）and PaleogenePeriod（60Ma）,inthe midlate Himalayan period,presumablysuperpositionofthe new tectonic hydrothermal mineralization.Zhaishang gold deposit have three metallogenic conditions,first enrichment of shallow and deep metallogenic material,followed by material migration has the power source strong,again is the change of the physical chemical conditions and ore containing sufficient space is an important guarantee for ore formation.Therefore,the formation of Zhaishang gold deposit is the result of multiphase superposition of many ore-forming factors in the relatively limited favorable metallogenic tectonic realm.

关 键 词：卡林型金矿 成矿动力环境 成矿条件 控矿因素 甘肃省 

分 类 号：P618.51[天文地球—矿床学]