甘肃大水金矿Au-As共生分异机理研究  被引量:1

Au-As Paragenesis and Separation Mechanism in Dashui Gold Deposit in Gansu Province

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作  者:杨斌[1,2] 彭秀红[1,2] 钟炎良[1,2] 

机构地区:[1]成都理工大学核技术与自动化工程学院 [2]四川省地学核技术重点实验室

出  处:《现代矿业》2014年第6期47-49,共3页Modern Mining

基  金:国家自然科学基金(编号:41103025);成都理工大学中青年骨干教师培养计划(编号:2012)

摘  要:从分布特征、迁移形式以及沉淀机制3个方面研究了大水金矿Au-As共生分异机理。结果表明:Au、As含量早期为共消长,后期为不消长关系,并且二者在空间上为不套合关系;Au、As的晶体化学和地球化学性质的相似性以及温度、压力、pH,决定了二者可以形成[AuAs]2-、[Au(AsS2)]0和[Au(AsS3)]2-络合物进行迁移;在主成矿期,成矿热液富砷贫硫以及后期物理化学条件的改变,Au、As在地壳中各自分异沉淀形成矿物;Au、As在成矿前期,主成矿期以及成矿晚期分别经历了共生、分离和富集3个阶段,在一定程度上解释了大水金矿的成因,为寻找新型砷矿床提供了思路。Abstract Au-As paragenesis and separation mechanism is analyzed from the perspective of distributing characteristic, migration forms and precipitation mechanism. The research results show that, the content of Au and As grows and declines simultaneously in early stage while grows and declines respectively in later stage. Besides that, they are not overlap in space. Temperature, pressure, pH as well as the similarity of crystal chemistry and geochemistry properties decide that Au and As are able to form clathrate of [ AuAs ] 2- [ Au ( AsS2 ) ] 0, [ Au ( AsS3 ) ] 2 - to migrate. In the main metallogenie period, due to the abun- dant selenium and scarce sulfur in ore-forming hydrothermal and the change of physical and chemical con- ditions, Au and As mineralize in earth crust by separating and precipitating. Au and As experience three stages of symbiosis separation and concentration in early stage ~ main stage and later stage of mineraliza- tion, which explains the origin of DaShui gold ore to some extent, puts forward the possibility mechanism of lacking sulfur from the angle of As and provides new idea for exploring similar ore deposit and finding new As ore deposit.

关 键 词:Au-As共生分异 分布特征 迁移方式 沉淀机制 

分 类 号:P618.51[天文地球—矿床学]

 

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