TYPOMORPHIC CHARACTERISTICS OF ARSENOPYRITE IN GOLD DEPOSIT AND OCCURRENCE OF GOLD: A case study of gold deposits in Hunan Province
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摘要: 湖南含砷金矿资源储量大，分布广，类型多.矿床中的砷矿物主要为毒砂，几乎所有金矿床中的毒砂都含Au（一般120×10-6~250×10-6），且比共生的黄铁矿含Au量高2~5倍，甚至1个数量级以上.毒砂中金的分布率高达64.3%~94.05%.毒砂的生成期有早、晚2期.化学成分为富S亏As型，并以富含微量元素Sb（Se）、Ni、Co而贫Mn及晶胞参数a0值增大等为标型特征.大多数含Au毒砂均含有相当数量的“不可见金”，即使利用电子探针也难以发现.初步认为毒砂中的“不可见金”多呈纳米级微细粒状存在.Abstract: As-bearing gold deposits in Hunan Province are broadly distributed, with large reserves and multiple types. The main As mineral is arsenopyrite, which in most of gold deposits contains Au (generally 120×10-6 to 250×10-6). The Au content in arsenopyrite is two to five times higher than that in the coexisting pyrite or more. The Au distribution rate in arsenopyrite is up to 64.3%-94.05%. The arsenopyrite was formed in two stages. It is chemically enriched in S and depleted in As, with rich Sb (Se), Ni and Co, poor Mn, and increased of unit cell parameter (a0). Most of the Au-bearing arsenopyrite contains invisible gold, which cannot be found even by electron microprobe. The invisible Au in arsenopyrite mostly occurs as nanometer fine grains.
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Key words:
- gold deposit /
- arsenopyrite /
- typomorphic characteristics /
- nanometet gold /
- Hunan Province
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