从桂西北隆或金矿的地质地球化学特征看微细粒浸染型金矿的可能成因

在区域微细粒浸染型（卡林型）金矿床物源、成矿作用和构造控矿等方面研究的基础上，重点讨论了桂西北隆或金矿的地质地球化学特征。研究结果表明，该金矿店的穹隆构造、深断裂控矿、多层位赋矿和围岩蚀变等矿床地质特征，在滇黔桂三省区交界地区微细粒浸染型金矿中既具有普遍性，又表现出特殊性，其原生成矿硅质流体可能主要直接来自深部岩浆源分异作用，但由于是在地壳中成矿．不可避免地受到部分地层的物质和流体的混杂，因而属于地慢上隆－构造岩浆活化分异－深大断裂导矿－次级断裂、背科控矿－交代充填成矿的中偏低温热液金矿床。

PRELIMINARY DISCUSSION ON THE POSSIBLE GENESIS OF THE CARLIN-TYPE GOLD DEPOSITS IN TERMS OF THE GEOLOGY AND GEOCHEMISTRY OF THE LONGHUO GOLD DEPOSIT, NORTHWEST GUANGXI

Based on the study of material source, mineralization mechanism and ore-controlling structure of regional fine-disseminated (Carlin-type) gold depeits, the geological and geochemical characteristics of the Longhuo gold deposit in Guangxi are discussed in this paper. The results show that such features as dome structure, orescontrolling deep fault, ore-bearing polylayer and wall-rock alteration in the Longhuo gold deposit are ubiquitous and typical in the Carlin-type gold deposits in the YunnanGuizhou-Guangxi region; its primary mineralization siliceous fluid is mainly derived from plutonic magma differentiation, but the plutonic fluid is partly contaminated inevitably by the material and fluid in the strata owing to mineralization in the crust. The ore deposit was formed in a low-moderate temperature hydrothermal process involving mantle doming, active differentiation of tectonic magmatism, deep and large faults as the channelways for ore-forming solutions, ore-controlling sub-faults and anticlines,and metasomatic filling.