四川石棉田湾金矿床中原生型和迁移型有机质及其成矿意义

四川石棉田湾金矿床中含有原生型干酪根和迁移型有机流体，在成矿期间由于含矿热液的改造，原生有机质发生热降解，生成小分子有机化合物，构成容易迁移的有机流体。同时，地表下渗的大气降水携带了细菌类微生物，对原生有机质进行生物降解，并生成硫化氢类还原物质。当含矿热液与有机流体及硫化氢混合时，促使矿液中金络合物被破坏，导致自然金的沉淀富集。

PRIMARY AND MIGRATORY ORGANIC MATTERS AND ITS MINERALIZATION SIGNIFICANCE IN THE TIANWAN GOLD DEPOSIT,SHIMIAN,SICHUAN PROVINCE

There are two types of organic matters:the primary kerogen and the migratory organic fluid in the Tianwan gold deposit,Shimian,Sichuan Province.During the gold mineralization,the primary kerogen was thermally degraded by thermal metallogenic solution and produced organic compound of small molecular weight composing organic fluid.Moreover,the microorganism which was brought by permeable surface water degraded the primary kerogen in sedimantary rocks and could produce reducing matters.The precipitation and the accumulation of natural gold originate from the mixing of the migratory organic fluid and the reducing matters with the thermal metallogenic solution,causing the decomposition of gold complex compounds.