甘肃桦树沟蚀变岩型铜矿床的地质特征及成矿作用讨论
The discussion on geological features and mineralizition of the Huashugou altered rock-type copper deposit in Gansu, China
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摘要: 桦树沟蚀变岩型铜矿床属一种破碎带蚀变岩型铜矿床,区域上具有明显的层控性,但在矿田和矿区范围,矿体明显受构造破碎蚀变带控制。作者通过对矿床地质特征、矿源层及成矿年龄的分析认为:桦树沟蚀变岩型铜矿床的形成经历了两个阶段的形成过程,第一阶段为中元古代裂谷期铜的预富集作用,表现为含铜条带状铁建造的形成,第二阶段为加里东造山期,条带状铁建造中的铜活化迁移到构造破碎蚀变带进一步富集,形成铜矿床。Abstract: Huashugou copper deposits belong to a kind of altered rock type copper deposit with the regional stratabound property, ore body is controlled by the fracture zone within mine district. On the analysis of the geological future of deposit and source bed as well as metallogenic age,the authors think that the Huashugou altered rock-type copper deposit is formed in two stages,the first stage is the period of Cu pre-enrichment under Proterozoic rift. Anather is the period which the Cu in banded iron-formation is remobilizationed to the fracture zone and enrichmented to form copper deposit in Caledonian orogeny.
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Key words:
- altered rock type copper deposit /
- geological feature /
- mineralizition /
- Huashugou /
- Gansu
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