黔西北威宁地区含铁铜地层及其矿物岩石学特征  

Mineralogy and Petrology of Iron-Copper Bearing Strata in Weining,Northwest Guizhou

作　　者：孟昌忠[1] 何明友[2] 张海[1,2] 郭佩佩[1,2] 李再勇 葛婉婷 

机构地区：[1]贵州省地矿局113地质大队,贵州六盘水553001 [2]成都理工大学,成都610059

出　　处：《矿物岩石地球化学通报》2015年第5期1058-1063,共6页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：贵州省国土资源厅地勘基金项目(2015-21);贵州乌蒙山区优势矿产资源综合调查评价(12120113052700)

摘　　要：近年来,在黔西北威宁地区发现了新的含铁铜地层,其含铁铜矿层的层位较稳定,规模较大,铁铜含量均达到综合利用的工业品位要求。采用矿物岩石学方法研究了含铁铜地层、矿物岩石及其矿化特征,结果表明,含铁铜地层为二叠系峨眉山玄武岩组第三段(P2β3)和宣威组(P3x)底部地层,岩性主要为火山角砾岩、凝灰质火山碎屑岩及细粒岩屑砂岩。沉积成岩为成矿奠定了物质基础,含Fe、Cu地下热液在扩散、循环过程中导致含矿地层中的铁铜发生活化、再富集成矿。Recently,a new iron-copper bearing stratum,which have great industrial values of iron-copper deposit,was found in the Weiling region,northwest Guizhou. This stratum is stable and in large scale. The iron-copper ores were analyzed and the results showed that contents of Fe and Cu in these ores reach the requirement of industrial utilization. The iron-copper bearing stratum,rocks and minerals as well as mineralization mechanism were studied by mineralogy and petrology methods. The iron-copper deposit genesis studies showed that the iron-copper bearing stratum is the stratum between the third group stratigraphic rocks（ P2β3） of the Emeishan basalt and bottom stratigraphic rocks of the Xuanwei group（ P3x）,and that it consists mainly volcanic breccia,tuffaceous volcaniclastic and fine-grained lithic sandstones.Deposition and diagenesis are major mineralization mechanisms. The iron-copper deposits were formed in this area by the syngenetic sedimentation,that is,the Fe-Cu containing underground hydrothermal activated Fe and Cu and re-enriched them in the ore-bearing stratum to form the iron-copper bearing stratum.

关 键 词：含铁铜地层 同生沉积 地下热液 活化再富集 黔西北 

分 类 号：P618.41[天文地球—矿床学] P618.31[天文地球—地质学]