杨子地台北缘中段中上元古界中金矿床成矿物理化学条件研究  

Studies on Ore-forming Physico-chemical Condition of Gold Deposits in Middle-Upper Proterozoic Suberathem in the Middle section of the Northern Margin of yangtze Platform

作　　者：汪东波[1] 

机构地区：[1]中国有色金属工业总公司北京矿产地质研究所

出　　处：《河北地质学院学报》1992年第6期595-604,共10页

摘　　要：通过对区内产于中上元古界中三类主要金矿床的矿物学、同位素地球化学和流体包裹体地球化学研究,本文分别给出了各类金矿床成矿流体的温度(T)、压力(P)、酸碱度(pH)、氧逸度(fo_2)、硫逸度(fs_2)、盐度ws、压力、密度(ρ)和流体的化学组成类型及各种组份的浓度。热力学计算表明:在成矿流体中金主要以硫金络合物的形式迁移,温度、压力、氧逸度和配体浓度的降低及pH的改变是引起金沉淀的主要因素。Through studies on mineralogy, isotope geochemistry and fluid-inclusion geochemistry of three types of gold deposit in Middle-Upper proterozoic suberathem in the area, ore-forming temperature (T). Ore-forming pressure (P). pH. oxygen fugacity (fo_2), sulfurl fugacity (fs_2), salinity (Ws). density (p) and chemical components and cone(?)ntration of ore-forming fluid have been given in this paper. Thermodynamics caculation shows that thio-complex of gold probabely is cheif transport form in ore-formin fluid. Decrease in temperature, pressure, oxygen fugacity and concentration of coordinative species and variation of pH are main factors which result in deposition of gold in Ore-forming fluid.

关 键 词：金矿床 成矿 物理化学条件 

分 类 号：P618.510.5[天文地球—矿床学]