胶东石家金矿床成矿流体特征及矿床成因  

Characteristics of ore-forming fluids and genesis of Shijia Gold Deposit in Jiaodong

作　　者：刘晓敏 于森 李金涛 李丽 丁文彪 薄军委 Liu Xiaomin;Yu Sen;Li Jintao;Li Li;Ding Wenbiao;Bo Junwei(No.3 Exploration Institute of Geology and Mineral Resources of Shandong Province;Shandong Province Engineering Research Center for Deep Gold Mine Detection Big Data Application Development)

机构地区：[1]山东省第三地质矿产勘查院 [2]深部金矿探测大数据应用开发山东省工程研究中心

出　　处：《黄金》2024年第9期74-80,共7页Gold

基　　金：国家自然科学基金项目(41973048);深部金矿探测大数据应用开发山东省工程研究中心开放课题(SDK202207)。

摘　　要：石家金矿床是位于栖蓬福成矿带北段的一个石英脉型金矿床,其成矿过程大致可以分为石英-黄铁矿阶段(Ⅰ)、金-石英-黄铁矿阶段(Ⅱ)、金-石英-多金属硫化物阶段(Ⅲ)、石英-碳酸盐阶段(Ⅳ)。成矿流体盐度为1.83%~10.74%,密度为0.61~0.90 g/cm^(3),属于低盐度、低密度流体;成矿温度275℃~325℃,成矿流体压力50~92 MPa,成矿深度1.67~3.07 km。综合特征揭示,该矿床为受花岗岩体穹隆上部的陡倾伸展断裂控制,幔源流体、岩浆流体和大气降水共同参与成矿的中温热液脉型金矿床。Shijia Gold Deposit is a quartz vein-type gold deposit located in the northern part of the Qixia-Penglai-Fushan Metallogenic Belt.The mineralization process can be broadly divided into 4 stages:quartz-pyrite stage(Ⅰ),gold-quartz-pyrite stage(Ⅱ),gold-quartz-polymetallic sulfide stage(Ⅲ),and quartz-carbonate stage(Ⅳ).The salinity of the ore-forming fluid ranges from 1.83%to 10.74%,with a density of 0.61-0.90 g/cm^(3),indicating low salinity and low-density fluids.The mineralization temperature is between 275℃and 325℃,with fluid pressures ranging from 50 MPa to 92 MPa,and a mineralization depth of 1.67-3.07 km.The comprehensive characteristics reveal that this deposit is a medium-temperature hydrothermal vein-type gold deposit controlled by steeply dipping extensional faults in the upper part of a granite dome,with mantle-derived fluids,magmatic fluids,and meteoric water jointly contributing to the mineralization.

关 键 词：矿床成因 成矿温度 成矿深度 流体包裹体 石家金矿床 胶东 

分 类 号：TD11[矿业工程—矿山地质测量] P618.51[天文地球—矿床学]