广西南丹芒场锡多金属矿田燕山期构造应力场研究  

THE STUDIES ON YANSHANIAN TECTONIC STRESS FIELD OF MANGCHANG TIN-POLYMETAL ORE FIELD NANDAN COUNTY, GUANGXI

作　　者：杨海明[1] 王思源[1] 沈镭 

机构地区：[1]中国地质大学

出　　处：《南方国土资源》1990年第3期35-43,共9页

摘　　要：广西南丹芒场锡多金属矿田现存的复杂构造图案是多期构造运动变形的产物。本文试图通过对该矿田野外研究的32个小构造(主要是共轭节理)应力场状态资料,结合对5件无矿石英脉错位密度定应力值,应用数学模拟法探讨了矿田主成矿期-燕山期构造应力场形成机制。认为在燕山期时矿田边界上受一对N-S向力偶的反扭作用结果;燕山期NW向岩、矿脉是先扭后张裂隙充填形成机制。The extant complicated tectonic pattern of Mangchang tin-polymetal ore field in Nandan County, Guangxi is the deformational product of polytectonic movement. Based on the information of state of stress field of thirty-two small structures (the conjugated joints predominate) in the ore field, in association with the application of mathematical modeling method to oriented stress values of displaced density of five pieces of ore-free quartz veins, this paper has tried to discuss the mechanism of the Yanshanian (the epoch of main mineralization) tectonic stress field; and believes that the boundary of the ore field was affected by the countertwisting force of a pair of north-south trending couples, and the Yanshannian north-western trending dikes and ore veins were formed by filling the fissures which sheared earlier and tensed later.

关 键 词：矿田构造 燕山期 应力场 数学模拟法 

分 类 号：P[天文地球]