粤桂边境庞西垌—金山银金矿床特征与成因  

GEOLOGICAL CHARACTERISTICS AND GENESIS OF THE PANGXIDONG-JINSHAN Ag-Au DEPOSIT IN YUNKAI TERRAIN,SOUTH CHINA

作　　者：王祖伟[1] 周永章[2] 

机构地区：[1]天津师范大学地理系,天津300074 [2]中山大学地球科学系,广东广州510275

出　　处：《大地构造与成矿学》2002年第2期193-197,共5页Geotectonica et Metallogenia

基　　金：国家科技部973项目(G1999043200);教育部骨干教师;优秀青年教师资助计划(教人司2001-39);博士点基金(2000099815);国家自然科学基金(40073010)资助.

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。地质地球化学研究结果表明,该矿床是中低温蚀变构造岩型银金矿床。矿床的成矿物质主要来源于前寒武系—寒武系变质岩系,燕山期英桥花岗岩浆活动提供了热源,驱使以大气降水为主含有岩浆热液的混合水循环并对围岩进行淋滤,形成成矿溶液体系;成矿溶液沿多期次活动的庞西垌—金山断裂带运移,在运移过程中与围岩发生蚀变作用,矿床最后定位,矿化与硅化、绢云母化、黄铁矿化关系密切。The Pangxidong -Jinshan Ag -Au ore deposit is located along the boundary z one between Guangdong and Guangxi Provinces,so uthern China.It is distributed alon g the Pangxidong -Jinshan fault system,and composed mainly of hydro thermally altered deformed rocks an d quartz veins.Based on the geological and geochemi cal research,we can draw a conclusio n as follow:The ore-forming elements came from Precambrian-Cam brian metamorphic rocks,which are t he country rocks of the Ag -Au ore deposit.The ore-forming fluid r esulted from meteoric water with partial magma water from Yingqiao granite magmatism during Yanshan stage.The meteoric water and partial magma water extracted the ore-forming mass during circulation drived by the heat from Yingqiao granite.The ore-forming elements affected the rocks and formed hydrothermal alteration when the fluids flow alone t he Pangxidong -Jinshan fault,of which the deposit is positioned.

关 键 词：银金矿床 矿床特征 矿床成因 庞西垌-金山 

分 类 号：P618.5[天文地球—矿床学]