山东焦家金矿床的成因探讨  

THE GENESIS OF THE JIAOJIA GOLD DEPOSIT, SHANDONG

作　　者：王鹤年[1] 汪耀[1] 

机构地区：[1]南京大学地球科学系

出　　处：《地质论评》1991年第3期250-257,T001,共9页Geological Review

摘　　要：焦家金矿明显受断裂破碎带控制,围岩蚀变强烈,是我国特有的重要金矿类型。本文通过矿床地质特征、矿物中流体包裹体和稳定同位素研究确定焦家金矿成矿温度为310℃,压力800×10~5pa,fo_2为10^(-34)—10^(-36)。成矿溶液为富钾、氯的流体。金来自胶东群含金建造,成矿与尚庄花岗闪长岩有关,为中深,中温岩浆热液金矿床。The Jiaojia gold deposit, an important special type of gold deposit in China, occurs in a fracture zone. Tectonite has undergone intense alteration. Widespread potash feldspathization is considered to be the metallogenic indicator, but gold is concentrated in a pyrite-sercitized tectonite zone. Based on a study of the geological features of the deposit, features of tectonic altered rocks, trace elements in altered rocks and stable isotopes and mineral inclusions of the deposit, this paper discusses the genesis and ore-forming physico-chemieal conditions of the Jiaojia gold deposit. The ore-forming temperature is 310℃, the pressure is about 800×10~5Pa, oxygen fugacity fo_2=10^(-34) to 10^(-36), the ore-forming solutions are rich in K^(1+) and Cl^(1-) ions. It is suggested that the upper Archean—Lower Proterozoic Jiaodong Group is the Au-bearing formation, which served as it gold source. The formation of the Jiaojia gold deposit is related to the Yanshanian faulting and anatexis of the Shangzhuang granodiorite. The deposit is a mesothermal gold deposit.

关 键 词：金矿床 地质特征 成因 

分 类 号：P618.510.1[天文地球—矿床学]