摘要
本文主要按多来源、多成因、多阶段的观点对长江中下游的矿床类型进行系统分类,并通过对与矿有关的岩浆岩系列的研究,深入探讨矿床系列的特征。同时分析内生矿床的主要控矿因素,归纳为铜陵、大冶、宁芜三个主要成矿模式,指出其综合控矿机制,并着重阐明矿床类型、矿床系列和成矿模式三者时间、空间的纵横关系和有关规律。
A systematic classification of deposit types in the middle and lower reaches of the Changjiang (Yangtze) River has been made, and 3 classes, 9 types and several independent types as well as some composite and transitional types have been distinguished according to the sources of ore-forming substances of copper, iron, sulfur and gold (polymetallic) deposits, geological environments for ore deposit formation and particularly mineralization in the region. The existence of ore magma-type iron deposits has been stressed again and the prospects of porphyry copper deposits and sedimentary superimposed-remoulding deposits have been summerized rather clear. Besides the minerogenetic series of ore deposits with local characteristics has been defined on the basis of the special relationship between the Yangtze-type syntectic magmatic rock series and the origin of ore deposits.The main ore-controlling factors are: fault, sequence of magmatic rocks, environment and ore-hosted horizons. It is indicated that the zoned network tectonic system of the Changjiang deep fault plays a basic role in controlling the genesis of rocks and ores. Magmatism and minerogenetic series is the internal cause for ore formation, the geological environment is a prerequisite for determining ore kinds and deposit types, and the stratabound nature and properties of country rocks are indispensable outer conditions for ore formation and concentrationl. Finally, according to the deposit types, minerogenetic series, geological setting and ore-controlling conditions, three main metallogenetic models are suggested; they are the Tonglin, Daye and Ningwu models. The ore-forming characteristics of various models are discussed. There are appreciable differences between various metallogenetie models, but regional ore-forming processes exhibit some regularities of evolution in time and space, and moreover the minerogenetic series, metallogenetic models and deposit types show correspondance, gradation and compounding both vertically and laterally.
出处
《地质论评》
CAS
CSCD
北大核心
1989年第5期398-408,共11页
Geological Review
