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鄂西恩施地区孤峰组普遍发育一套含骨针和放射虫的硅质岩夹炭质页岩。通过硅质岩岩石学和地球化学特征研究,综合判断中二叠统孤峰组硅质岩沉积环境为大陆边缘中下部与深水盆地结合部位,具有生物与热水混合成因特征,且向上热水参与作用增强,从而导致了矿物元素的分异。结合全岩样品分析结果,认为富矿层位为中上部炭质页岩含量较高的层位,建立了找矿标志,为本区地质找矿工作做出了重要贡献。
A set of siliceous-rock-capped carbonaceous shale containing bone spurs and radiolarians has been widely developed in the Gufeng Formation in the Enshi area. Based on the petrological and geochemical characteristics of the siliceous rocks, it is concluded that the sedimentary environment of the siliceous rocks in the Gufeng Formation in the Middle Permian is a combination of the middle and lower parts of the continental margins and the deep-water basins, and is characterized by bio-hot water mixing and upward hot water The role of participation is enhanced, leading to the differentiation of mineral elements. Combined with the analysis results of whole rock samples, it is considered that the ore-bearing layer is a layer with a high content of middle and upper carbonaceous shales, and a prospecting indicator is established, which makes an important contribution to the geological prospecting work in this area.