广西老堡铅锌矿褶皱形成机制及其控矿规律  

Formation Mechanism and Ore-Controlling Rules of the Folds in Laobao Pb-Zn Deposit,Guangxi

作　　者：李文杰[1,2] 梁金城[2] 陆小平 蒙龙华 

机构地区：[1]西南科技大学环境与资源学院,四川绵阳621010 [2]桂林理工大学资源与环境工程系,广西桂林541004 [3]广西地勘局271地质队,广西桂林541000

出　　处：《桂林工学院学报》2009年第2期242-246,共5页Journal of Guilin University of Technology

基　　金：广西区国土资源厅地质勘查专项资助项目(桂国土资函[2003]519桂地矿科[2004]04)

摘　　要：老堡铅锌矿床主要赋存在陡山沱组白云岩或老堡组硅质岩中,顺层产出,受地层与褶皱的双重控制。矿区主干褶皱为一复式向斜,由2个次级向斜和1个次级背斜组成。从构造几何学、运动学角度,运用现代测试技术,对矿区的小构造、显微构造和组构进行构造分析后揭示,老堡褶皱构造的形成机制是以弯滑作用为主、兼具弯流作用的纵弯褶皱作用的产物。铅锌矿体主要赋存在褶皱的转折端虚脱部位及两翼滑移量较大的层间滑动破碎带中。Laobao Pb -Zn deposit mainly beds in the dolomite of the Doushantuo Group and in the silicalite of the Laobao Group, and is controlled both by strata and folds. The main fold in the mining area is a compound syncline, composed of two sub synclines and one sub anticline. Based on the tectonic, geometric and movement features, the analysis on the small structures and micro-structures and fabrics reveals that the formation mechanism of Laobao folding structure is the result of the longitudinal flexural folding, featuring by flexure-slide and flecure-flow folds. The Pb -Zn ore mainly exists in the deeollement zones around the diversion areas and in the interformational gliding fracture zone in both wings within the fold.

关 键 词：铅锌矿床 褶皱机制 岩组分析 构造控矿 老堡 广西 

分 类 号：P613[天文地球—矿床学] P618.42[天文地球—地质学]