滇黔桂微细浸染型金矿深源流体成矿机理探讨  

AN APPROACH ON MECHANISM OF JUVENILE FLUID MINERALIZATION FOR CARLIN-TYPE GOLD DEPOSITS IN YUNNAN-GUIZHOU-GUANGXI

作　　者：刘显凡[1] 苏文超[1] 朱赖民[1] 

机构地区：[1]中国科学院地球化学研究所

出　　处：《地质与勘探》1999年第1期14-19,共6页Geology and Exploration

基　　金：中国科学院八五黄金攻关课题;中国科学院矿床地球化学开放研究实验室资助

摘　　要：通过成矿热液矿物流体包裹体的成分、热力学和同位素地球化学研究，初步认为本区金矿原生成矿流体主要沿深大断裂通道直接来自上地幔；引进纳米理论和纳米效应，提出深源成矿流体中Ａｕ主要以纳米微粒自然金形式迁移，但随着流体运移至地壳成矿过程中，其物理化学条件随着地层水、大气降水和地层物质的局部混染和覆盖发生改变，导致流体中的部分Ａｕ呈Ａｕ—Ｓｉ配合物和Ａｕ—Ｓ配合物形式在一定范围内迁移，进而三种迁移形式又在一定条件下发生分解、沉淀和金的聚集；由此进一步认识到，可能正是这种深源与浅源的混染并交代岩石。On the basis of pre-existing data and investigation of composition ,thermodynamics and isotope geochemistry of fluid inclusions hosted in minerals which are intimately associated with gold mineralization,the viewpoint that prim ary ore-bearing siliceous fluid that migrates along the deep and large fracture may be directly derived from upper mantle in the area studied have been discusse d.In terms of nano-theories and nano-effects,the idea that Au is migrated chiefl y in the form of nano-particle natural gold in ore-bearing fluid from plutonic r esource is put forward.But,physical-chemical conditions of fluid are changed by part contamination and concealment of strata and precipitate water and strata ma tter while the fluid moves from mantle to crust,and the result lead inevitably t o the change of Au migrational mode,as Au is migrated partly in the form of Au -Si and Au-S complex in the limited extend crust.Above three migrational mode ar e inevitably decomposed and settled and gathered for Au on the certain condition s.Based on the study in this paper,the writers have an important understanding t hat maybe it is the contamination of fluids from plutonic and shallow resource a nd the metasomatism of mixed fluid on rocks that creat conditions favourable to forming large and superlarge deposits.

关 键 词：金矿床 液包体 物理化学条件 深源流体 成矿机理 

分 类 号：P618.510.4[天文地球—矿床学] P618.510.5[天文地球—地质学]