江西中西部萍乐坳陷带西段微细浸染型金矿的控矿构造
Ore-controlling structures of micro-disseminated gold deposits in Pingle depression, central-western Jiangxi
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摘要: 萍乐坳陷带西段微细浸染型金矿的控矿构造包括武功伸展构造体系的高角度断层、近水平顺层拆离断层及伸展过程中派生的短轴背斜,它们组成一个构造网络,成为含金热液循环的良好通道。伸展构造体系浅层次脆性变形域控制着金矿田的分布;浅层次脆性伸展构造的根带和峰带控制着成金矿带的展布;伸展过程中派生的短轴背斜控制着金矿区的分布,而近水平顺层拆离断层与短轴背斜复合的背斜轴部则控制着金矿体。Abstract: The ore-controlling structures of micro-disseminated gold deposits in Pingle depression are composed of high-angle fault of Wugong extensional fault system, subhorizontal bedding detachment fault and brachyanticline derived in the stretching process, constituting a structural network which becomes a good channel-way for gold-bearing hydrothermal circulation. The distribution of gold orefields is controlled by low-level brittle deformation range of the extensional fault system, the distribution of gold ore belts is controlled by the root and peak of the low-level brittle extensional fault, the distribution of gold ore districts is controlled by the brachyanticline derived in the stretching process, and the distribution of gold deposits is controlled by the subhorizontal dotachment fault and anticline axis of brachyanticline.
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