矿床地质2013，Vol.32Issue(4)：823-842,20.
金矿床中金与黄铁矿和毒砂的关系
Hydrothermal evolution of gold-bearing pyrite and arsenopyrite from different types of gold deposits
摘要
Abstract
This study investigates the microstructures,geochemistry,and hydrothermal evolution of gold-bearing pyrite and arsenopyrite from Carlin type (both in the USA and China),turbidite hosted gold deposits of China,intrusion related gold deposits,epithermal gold deposits and six orogenic gold deposits in the Archean Eastern Goldfields Province,Western Australia.Scanning electron microscope (SEM),EPMA,and LA-ICP-MS analyses show that the gold-bearing pyrite and arsenopyrite possess a number of similar textural features,including the occurrence of invisible gold within initial phases of growth,and later-stage visible gold associated with alteration rims.The alteration rims are characterized by a higher-than-average atomic mass (mainly owing to arsenic enrichment) and are preferentially located along fractures and grain boundaries in the pyrite and arsenopyrite.These observations suggest that visible gold formation is associated with hydrothermal alteration of preexisting pyrite and arsenopyrite.Textural observations and LA-ICP-MS data suggest that some invisible gold was remobilized from early-formed pyrite and arsenopyrite to form visible gold during the development of these alteration rims and fractures.Based on sulfide stability relations,the authors hold that the development of arsenopyrite alteration rims associated with late-stage visible gold formation was related to an increase in temperature (maximum increase from 310℃ to 415℃) and up to six orders of magnitude increase in sulfur fugacity.It is suggested that the transform from invisible to visible gold depends on the fluid conditions and chemistry.关键词
地球化学/不可见金/可见金/黄铁矿/毒砂/热液/蚀变环带Key words
geochemistry, invisible gold, visible gold, pyrite, asenopyrite, hydrothermal fluid, alteration rim分类
天文与地球科学引用本文复制引用
卢焕章,朱笑青,单强,王中刚..金矿床中金与黄铁矿和毒砂的关系[J].矿床地质,2013,32(4):823-842,20.基金项目
本文得到国土资源部公益性行业科研专项经费项目(编号:201011046)资助 （编号:201011046）
