成都理工大学学报（自然科学版）2025，Vol.52Issue(4)：253-269,17.DOI:10.12474/cdlgzrkx.2024011902
川西铜炉房造山型金矿床成因:基于矿物学、流体包裹体和热力学模拟的证据
Ore genesis of the Tonglufang orogenic gold deposit in western Sichuan:Constraints from mineralogy,fluid inclusions,and thermodynamic simulations
摘要
Abstract
The Tonglufang gold deposit is located in the southwestern part of the Songpan-Ganzi orogenic belt,in the Guza-Kongyu-Danba gold metallogenic province.Gold-bearing ores in the Tonglufang deposit are mainly found in pyrite-rich quartz veins,sulfide-rich quartz veins,and malachite/limonite-rich quartz veins.Based on a field investigation and microscope analysis,the gold mineralization is divided into two stages:(Ⅰ)a quartz-gold-pyrite stage and(Ⅱ)a quartz-gold-polymetallic sulfide stage.In this paper,the genetic types and mineralization characteristics of the Tonglufang gold deposit are analyzed by means of electron probe microanalysis(EPMA),fluid inclusion,laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS)mapping,and thermodynamic calculations.The microthermometric analysis of fluid inclusions reveals two homogenization temperature peaks(300～320℃and 360～380℃)and two salinity(NaCleqv)peaks(8％～10％and 12％～14％),indicating low to intermediate temperature and salinity in the ore-forming,H2O-NaCl-CO2-type fluid.The LA-ICP-MS mapping analysis shows that the contents of trace elements including As,Au,Ag,Cu,Pb,Zn,Co,Ni,Bi,and Sb are much higher in the pyrite at stage Ⅰ than those at stage Ⅱ,while the Au/Ag ratios are low in the pyrite in both stages.The characteristics of the ore-forming fluids and mineral assemblages may indicate the Tonglufang deposit is an orogenic gold deposit,while the range of gold fineness and trace element composition of pyrite may indicate a mantle-fluid origin.关键词
金成色值/流体包裹体/LA-ICP-MS/铜炉房金矿床/松潘—甘孜造山带Key words
gold fineness/fluid inclusion/LA-ICP-MS/Tonglufang gold deposit/Songpan-Ganzi orogenic belt分类
地质学引用本文复制引用
周春波,梁翼,葛行飞,屈尚伦,沈开红,徐勇,刘洋,黄皓南,角兴宇,裴秋明..川西铜炉房造山型金矿床成因:基于矿物学、流体包裹体和热力学模拟的证据[J].成都理工大学学报（自然科学版）,2025,52(4):253-269,17.基金项目
国家自然科学基金项目(41702077) （41702077）
中央高校基本科研业务费专项资金(2682016CX090). （2682016CX090）
