矿田构造发展特征

本文主要以内生脉状矿床为例,简要地论述了矿田构造的基本特征和发展规律。

THE CHARACTERISTICS OF THE DEVELOPMENT OF ORE FIELD STRUCTURE

This paper is devoted to the study of main characteristics of ore field structure in relation to the vein ore deposits.(1)In this paper,two groups of ore fields are classified,the syngenetic type and the diplogentic type.Ore field structures belong to three periods,the fundamental structure,the mineralogenetic structure and post-mineralogenetic structure,including several stages in each period.(2)In the genetic stage of structure dominated the horizontal compression while the deformation-fracturing process reflected in general the stereoscopic characteristics.(3)In the development stage of structure,i.e-open intrusion filling stage dominated tension caused by vertical uprising providing a favourable passage and site for the rising magma and ore fluid.(4)Horizontal compression and uprising tension acted as two principal factors in endogenetic mineralization.In this case the ore field structure is generally characteristic of alternative action of compression and tension.(5)Compressive stress changes its orientation at a right angle in each genetic stage that is roughly the same with the maximum tension in each development stage.(6)As a result of repeated tectonic movements,the superimposition and inherency of structures expressed in the form of a variety of coincidence and pulsation can be often found in the ore fields.(7)The whole developmental history of ore field structure turns out to be a long,multi-staged,intermittent and complicated process,which has undergone repeated tectonic movements with the stress field changing more than once.