微细浸染型金矿床的一种新的亚类——硅质岩型金矿  

A NEW SUBTYPE OF SEDIMENT-HOSTED MICRO-DISSEMINATED GOLD DEPOSITS——SILICALITE-TYPE GOLD DEPOSIT

作　　者：张湖[1] 李统锦[1] 

机构地区：[1]中国科学院广州地球化学研究所,广东广州510640

出　　处：《地学前缘》2004年第2期361-372,共12页Earth Science Frontiers

基　　金：中国科学院黄金科技工作领导小组办公室黄金科技项目 (KY85 12及KZ95 1 A1 40 4 0 1 0 4) ;广东省自然科学基金项目( 940 73 0及 990 5 2 3 ) ;国家攀登计划资助项目 (PD A 3 0 0 6)

摘　　要：根据广东和广西 3个金矿床 (长坑 ,高龙和果提 )的资料认为 ,微细浸染型金矿 (卡林型金矿 )中存在一种亚类 ,叫做硅质岩型金矿。它以碳质硅质岩为含矿主岩 ,该岩石宏观上呈层状 ,主要由细小的石英和碳质物组成 ,金呈微细浸染状存在。该类矿床具有一般微细浸染型金矿床的主要特征 ,但不属于后生热液蚀变交代成因 ,而是主要通过热水沉积作用形成 ,同时可以混入一定量的生物沉积和冷水沉积的物质。由此认为 ,微细浸染型金矿有多种成因 ,包括后生热液成因 ,热水沉积成因以及其他成因 ,应该从“热水沉积同生成矿”的角度考虑硅质岩型金矿的找矿思路。建议对一些金矿区的“硅化岩”重新研究 ,查明其真正属性。On the basis of the actual material and data from three gold deposits(Changkeng, Gaolong and Guoti) in Guangdong and Guangxi provinces of China, we suggested that within the sediment-hosted micro-disseminated-type(Carlin-type) gold deposits, there is a subtype which could be called silicalite-type gold deposit. Its main gold-bearing rocks are carbonaceous silicalites, which have stratiform occurrence and are composed of tiny quartz and carbonaceous matter principally. The gold exists in submicroscopic and disseminated form. This kind of gold deposits possesses the principal characteristics of general sediment-hosted micro-disseminated gold deposits, but does not belong to deuterogenic hydrothermal alteration-metasomatism origin. They were mainly formed by sedimentary exhalation, meanwhile, could be mixed with certain quantity of organo-sedimentary and normal marine sedimentary materials. It is proposed that sediment-hosted micro-disseminated gold deposits have varied geneses, including deuterogenic hydrothermal origin, sedimentary exhalation origin and other origins. The guideline for searching the silicalite-type gold deposits would be obtained from thinking about the idea of the “sedimentary exhalation-syngenetic metallogenesis”. It is recommended to re-study the so-called “silicified rocks” in certain sediment-hosted micro-disseminated gold mining areas in order to find out their true attribution. Finally, the southern China is one of the best prospecting areas to search silicalite-type gold deposits.

关 键 词：微细浸染型 卡林型 金矿床 硅质岩 热水沉积 矿床类型 广东 广西 

分 类 号：P618.1[天文地球—矿床学]