银洞坡大型层控金矿床矿源层原生沉积条件分析  

SEDIMENTARY ENVIRONMENT ANALYSIS OF SOURCE BED OF YINDONGPO STRATIFIED Au MEGADEPOSIT IN TONGBAI

作　　者：吴冲龙[1] 王根发[1] 袁艳斌[1] 

机构地区：[1]中国地质大学资源学院

出　　处：《地球科学（中国地质大学学报）》1998年第1期85-91,共7页Earth Science-Journal of China University of Geosciences

基　　金：地矿部八五基础研究项目

摘　　要：运用沉积学的原理和方法，对银洞坡歪头山组中段含金绿片岩系进行了细致的原岩恢复和成因地层分析．研究成果表明，该岩系沉积于秦岭古微陆块北侧的陆表海盆地中，受弱风暴和波浪控制，三角洲作用微弱，海底中、酸性火山活动频繁而强烈．主要含矿层Ｐｔ３ｗ２－２２沉积时，研究区处于火山作用间歇阶段的半封闭低能海湾环境．海底火山喷发和喷气热液作用给这里带来大量的火山碎屑和金银多金属成矿物质，适宜的水动力条件、水介质条件和有机质条件，促使这些矿质浓集和沉淀，导致矿源层的形成．The sedimentary principles and methods are employed to reconstruct the protolith and to analyse the genetic stratigraphy in middle Waitoushan Formation, Yindongpo. The studies disclose that the greenschist series are formed in low-energy storm and wave-dominated landlocked sea basin, with moderate delta process as well as frequent and intense sea medium and acidic volcanic activities, in the northern margin of the Qinling proto-micro plate. A great quantity of volcanic debris and multi-metallogentic Au-Ag deposits formed by sea volcanic activities and hydrothermal emanation activities are concentrated and deposited in favorable semi-closed low-energy bay to form ore protolith (Pt3w2-22) during volcanic inactive periods.

关 键 词：金矿床 矿源层 沉积条件 层控构造 银洞坡 

分 类 号：P618.510.2[天文地球—矿床学]