胶莱盆地东北缘郭城金矿床成矿流体特征及矿床成因  

Characteristics of ore-forming fluids and genesis of Guocheng Gold Depositin the northeast margin of Jiaolai Basin

作　　者：李志强 丁正江 薄军委 王志新 李勇 纪攀 李婷婷 Li Zhiqiang;Ding Zhengjiang;Bo Junwei;Wang Zhixin;Li Yong;Ji Pan;Li Tingting(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;State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences(Wuhan))

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 [3]中国地质大学(武汉)地质过程与矿产资源国家重点实验室

出　　处：《黄金》2024年第5期57-63,共7页Gold

基　　金：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);国家自然科学基金项目(41973048);中国地质大学(武汉)地质过程与矿产资源国家重点实验室开放课题(GPMR202203)。

摘　　要：郭城金矿床位于胶莱盆地东北缘,由土堆矿段、沙旺矿段、东刘家矿段、龙口矿段和后夼矿段等组成,受以郭城断裂为主的拆离构造体系控制。矿石中石英流体包裹体岩相学、显微测温等研究结果显示,流体包裹体分为气液两相包裹体、含CO_(2)三相包裹体和纯液相包裹体3种类型;成矿流体盐度为1.39%~16.53%,密度0.56~1.00 g/cm^(3),属于中低盐度、低密度流体;成矿温度为200℃~360℃,成矿流体压力60~125 MPa,成矿深度6.22~9.31 km。结合前人研究成果,认为郭城金矿床成因类型是受郭城断裂为主拆离构造体系控制、地幔流体参与成矿的中温热液脉型金矿床。Guocheng Gold Deposit is located on the northeast margin of Jiaolai Basin.It is composed of Tudui ore section,Shawang ore section,Dongliujia ore section,Longkou ore section,and Houkuang ore section.It is controlled by the detachment structural system dominated by Guocheng fault.The petrography and microscopic temperature measurement of quartz fluid inclusions in the ore show that the fluid inclusions in the deposit can be divided into 3 types:gas-liquid two-phase inclusions,CO_(2)-containing three-phase inclusions,and pure liquid phase inclusions.The salinity of ore-forming fluid is 1.39%-16.53%,and the density is 0.56-1.00 g/cm^(3).It belongs to medium-low salinity and low-density fluid.The ore-forming temperature is 200℃-360℃,and the pressure of ore-forming fluid is 60-125 MPa.The ore-forming depth is 6.22-9.31 km.Based on predecessors research achievements,it is considered that the genesis of Guocheng Gold Deposit is a mesothermal hydrothermal vein type deposit,of which the mineralization involves mantle fluid,controlled by the detachment structural system dominated by Guocheng fault.

关 键 词：流体包裹体 成矿温度 成矿深度 矿床成因 郭城金矿床 胶莱盆地东北缘 

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