层控矿床构造及其控矿作用

STRUCTURAL FEATURESOF THE STRATIFORM DEPOSITSAND THEIR ORE-CONTROLLING ROLE

近年来层控矿床已成为国内外地质工作者研究讨论的中心问题。目前在很多方面还存在着不同的看法,但大都认为层控矿床受一定层位或岩性(岩相)单元控制,大体上经过沉积或火山—沉积作用,变质或构造—变质作用以及应力变形构造作用,具有多种成因和复合迭加的特征。目前研究的重点主要集中在层控矿床的地层岩相、沉积建造、成矿物质来源及其形成的地球化学环境与成因等方面,而对层控矿床的构造特征及其控矿作用的重要意义认识不深,研究的也不够。大量的勘探开发实践证明:层控矿床的构造是非常复杂的,应力变形构造和构造—变质作用对层控矿床的形成演化、时空分布、

This paper discusses the structural features for different origins in the stratiform deposits.These features are those of the synsedimentary deformation structure and tectonic-metamorphic deformation structures. A set of discriminatory criteria between them is also discussed.The three main types of the ore-controlling structures in the stratiform deposits are put forward, that is, the interstratif ied sh-earstructure, the plastic flow structure and the composite structure of the in-terstratified conformable structure with cross-fault. In addition,the methods of the analysis and classification of folds in the stratiform deposits are introduced.