浅谈构造强度控矿  

Discussion on ore control of tectonic strength

作　　者：关连绪[1] 

机构地区：[1]武警黄金地质研究所,河北廊坊065000

出　　处：《黄金地质》2002年第4期1-7,共7页Gold Geology

摘　　要：内蒙古乌拉山金矿的大地构造背景和矿床地质特征表明 ,构造作用是控矿的主导因素。构造控矿的实质在于适宜的构造强度 ,也就是制约着岩石相变和化学元素聚散程度的构造变形和构造位移的程度。构造强度分 2类 4亚类 ,强调量化和量比关系。研究区的构造强度控矿宏观上表现为构造强度控制乌拉山群的变质和混合岩化程度 ;历经五台—燕山构造期广袤数十千米的成矿时空演化 ;构造强度阈值σ′ <σ <σ″ ,即强度过小或过大都不利于成矿 ;成矿机制和成矿阶段性的原因在于相当规模的断裂构造与成矿流体的多次活动 。The ore-forming tectonic setting and deposits geological features of the Wulashan in Inner Mongolia show that the tectonic movement is the main factor of ore control.The essence of tectonic ore control lies in the proper tectonic strength restraining the facies changes of the rocks and the chemical elements assemblage degree and the tectonic deformation(includes displacement) degree.The tectonic strength can be divided into 2 types and 4 subtypes,which were emphasized the relationship between quanlization and quantitative comparison.The tectonic strength ore control of the studying area displays that the tectonic strength controls the metamorphism and migmatization degree of the Wulashan groups, and the spatial and time evolation of mineralization which extended more than 10 km and passed through the Wutai to Yanshanian structural period.The threshold value is at,that is,whatever bigger or smaller the strength is,it will useless to the ore-forming.The ore-forming mechanism and its periodic essence lies in the rather-scale fault structure and many times movements of ore-forming fluids, which can be reflected by the curve of strain-stress on structural mechanics.

关 键 词：构造强度 内蒙古 金矿床 成矿流体 成矿机制 

分 类 号：P618.51[天文地球—矿床学]