胶东新城金矿床流体—构造与成矿关系研究  

Fluid-structure and Mineralization of Xincheng Gold Deposit in Jiaodong Area

作　　者：夏锐[1,2] 郭春影[1,2] 郭晓东[1] 

机构地区：[1]武警黄金地质研究所,河北廊坊065000 [2]中国地质大学(北京)地质过程与矿产资源国家重点实验室,北京100083

出　　处：《黄金科学技术》2012年第3期23-30,共8页Gold Science and Technology

摘　　要：通过对新城金矿床2种矿化类型矿体矿石的成矿流体特征进行对比研究,认为细脉浸染型Ⅰ号矿体矿石形成于中—低温(均一温度为376～124℃)、低盐度(5.0%～10.5%)和低密度(0.787～0.985 g/cm3)环境中,成矿深度为0.03～12.86 km;细脉或网脉型V号矿体矿石形成于中温(均一温度为332～191℃)、低盐度(4.0%～8.5%)和低密度(0.814～1.013 g/cm3)环境中,成矿深度为1.33～11.42 km。Ⅰ号和Ⅴ号矿体矿化类型属于同一岩浆和流体成矿系统在不同物理化学条件下的产物,表现出随流体成矿作用的进行,矿化由深部的陡倾角断裂带向浅部缓倾角断裂带推进,围岩地层的影响逐渐增强,矿体类型由网脉型向浸染型演化。由此建立了新城金矿的成矿模式,即流体—构造与成矿系统在时空结构的统一下(即不同的位置上含矿流体在运移和物质卸载方式不同),含矿流体运移途径中发生不同性质的成矿作用,并形成一系列不同的矿化类型及矿床。Xincheng gold deposits mainly develop the orebodies of the altered rock type （No. I orebody） and quartz vein type（No. V orebody）.As the genesis research in gold deposit of Jiaodong peninsula advance further,investigation for the metallogenic process and resource potential in the Xincheng gold deposit is more and more significant.The results showed that the ore-forming fluid of altered rock type orebodies is mainly middle-low temperature with homogenization temperature from 376 ℃ to 124 ℃,low salinity （NaC1 eqv.） from 5.0% to 10.5%, low density with density from 0.787 g/cm^3to 0.985 g/cm^3,metallogenic depeth from 0.03 km to 12.86 km. The ore-form- ing fluids of quartz vein type orebodies mainly in middle temperature with homogenization temperature from 332 ~C to 191 ~C,low salinity （NaC1 eqv.） from 4.0% to 8.5%,1ow density from 0.814 g/cm3 to 1.013 g/cm3, metallogenic depth from 1.33 km to 11.42 km.The identical magma and fluid metallogenic system generated the mineralizing types of No. I and No. V orebodies under different physicochemical conditions,displaying that with the process of mineralization, ore-forming took place from the fault, through the contact between steep-angle fault in deep and low-angle fault in shallow,to the distal wallrock outward,and the effect of wallrock intensified gradually and the evolution of mineralizing type formed quautz vein type at first,then quartz vein type-quartz mixed,finally,altered rock type dominantly.Metallogenic model of the Xincheng gold deposit is built up,showing that the deposit consists different kinds of mineralizing types and metallogenic models.

关 键 词：流体包裹体 流体—构造 胶东 新城金矿 

分 类 号：P618.51[天文地球—矿床学]