粤桂边境庞西垌—金山银金矿床成矿条件与形成机理  

The Forming Process of Pangxidong-Jinshan Ag-Au Mines

作　　者：王祖伟[1] 周永章[2] 张恩[2] 

机构地区：[1]天津师范大学城市与环境科学学院,天津300074 [2]中山大学地球科学系,广东广州510275

出　　处：《中山大学学报（自然科学版）》2002年第3期81-85,共5页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家科技部 973资助项目 (G19990 432 0 0 ;95 -预 - 39-V2 ) ;国家自然科学基金资助项目 (4 0 0 730 10 ) ;教育部骨干教师资助项目 (2 0 0 0 - 0 2 4- 415 10 3) ;优秀青年教师资助项目 (教人司 2 0 0 1- 39) ;教育部博士点资助项目 (2 0 0 0 0 99815 )

摘　　要：庞西垌—金山银金矿床位于广东廉江县与广西博白县的交界 ,是一个以银为主 ,含有金、铅、锌等伴生有益组分的银多金属矿床。研究表明 ,前寒武系—寒武系变质岩系是银金矿床的主要矿源层 ,其具有的高Ag和高Ag/Au比值特征 ,为本区形成以Ag为特色矿床的提供了重要的物质基础 ;燕山期英桥花岗岩为成矿热液的形成和活动提供了热源 ,驱使以大气降水含有岩浆热液的混合水循环并对围岩混合岩和花岗岩进行淋滤 ,形成成矿溶液 ;多期次活动的庞西垌—金山断裂带不仅为花岗岩浆活动提供通道 ,而且使两侧岩石产生节理和裂隙 ,有利于热液的循环、淋滤和定位 ,并直接成为矿质沉淀的场所 ;含矿断裂的热液围岩蚀变作用是矿床最后定位的决定性因素 ,矿化与硅化、绢云母化、黄铁矿化关系密切。Pangxidong_Jinshan Ag_Au mineralization belt is located along the boundary zone of Guangdong and Guangxi, southern China. It is part of the famous Yunkai metamorphic block in term of tectonics. The latter has a Au_Ag_rich basement, and the studied Lianjiang_Bobai region is specially high in the ratio of w (Ag)/ w (Au) in contrast with other areas of the Yunkai block.The Ag_Au deposits are distributed along the Pangxidong_Jinshan fault system, and composed mainly of hydrothermally altered deformed_rocks and quartz veins.The deposits were formed in multiple phases of geological and geochemical evolution. A source formation rich in noble metals was formed during the Precambrian_Cambrian period, and the mineralization elements were redistributed with the source rocks during the Jinning and Caledonia regional metamorphic period. Magmatism and deformatiom were developed during the Yanshan stage, followed by hydrothermal alteration, of which final mineralization is an integral part.

关 键 词：粤桂边境 庞西垌-金山 银金矿床 成矿条件 形成机理 地球化学 矿床地质 成矿机理 广东 广西 

分 类 号：P618.5[天文地球—矿床学]