论文部分内容阅读
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。
Located in the border of Lianjiang County, Guangdong Province and Bobai County of Guangxi Province, the Jinshan silver-gold deposit is a silver-polymetallic deposit mainly composed of silver and containing the associated beneficial components of gold, lead and zinc. The results show that the Precambrian-Cambrian metamorphic rocks are the main source rocks of silver-gold deposits, and their high Ag and Ag / Au ratio characteristics provide important information for the formation of Ag- Material basis; Yanshanian Yingqiao granite provides a heat source for the formation and activity of hydrothermal fluids, driving the circulation of mixed water containing magmatic hydrothermal fluids in the atmosphere and leaching the surrounding rock mixed granites and granites to form ore-forming solutions; and more Periodic activities of the Pangxi 垌 - Jinshan fault zone not only provide access for the activity of granite magma, but also to produce joints and fissures on both sides of the rock, which is conducive to hydrothermal cycling, leaching and positioning, and directly become the site of mineral deposits; ore-bearing faults The alteration of hydrothermal wall rocks is the decisive factor for the final localization of mineral deposits. Mineralization is closely related to silicification, sericitization and pyrite mineralization.