摘要
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。
The Middle Permian Gufeng Formation in western Hubei typically consists of thin--bedded sili- ceous rocks, carbonaceous-siliceous rocks, and carbonaceous shales. On the basis of petrologic and geo- chemical data, we conclude that the siliceous rocks were deposited in the middle-low part of continental margin and deep basin. The deposition of the Gufeng Formation was influenced by both biological and hy- drothermal activities, with increasing hydrothermal influence in the upper Gufeng Formation leading to ef- fective mineralization. Based on our analysis, carbonaceous shales in the middle and upper Gufeng Forma- tion have the highest potential for mineralization and should be the main prospecting target in this area.
作者
李朋
胡正祥
宗维
周峰
杜小锋
吴龙
LI Peng HU Zheng-xiang ZONG Wei ZHOU Feng DU Xiao-feng WU Long(Hubei Geological Survey, Wuhan 43003)
出处
《地层学杂志》
CSCD
北大核心
2017年第3期344-350,共7页
Journal of Stratigraphy
基金
中国地质调查局大调查项目(12120114066101)
中国地质调查局扬子工程湘西-鄂西成矿带神农架-花垣地区地质矿产调查二级项目(No.DD20160029)
关键词
岩石地层
地球化学特征
硅质岩
成因
孤峰组
二叠系
恩施
湖北
lithostratigraphy, geochemical characteristics, siliceous rock, genesis, Gufeng Formation, Permian, Enshi, Huhei
