从西南硫矿带内黄铁矿生物组构论微生物成矿作用  

On Biological Mineralization with Reference to the Biological Textures of the Pyrites from the Southwest Sulfide Zone

作　　者：夏学惠[1] 

机构地区：[1]化工部地质研究所

出　　处：《沉积学报》1993年第4期85-91,共7页Acta Sedimentologica Sinica

摘　　要：西南硫矿带黄铁矿床主要产于二叠系龙潭组底部,硫铁矿的形成与峨眉山玄武岩喷发活动有一定关系,本文主要研究了区内生物结构黄铁矿的成因,认为生物组构莓状黄铁矿成因与生物菌群及微生物富集作用有关。研究表明,该区内的黄铁矿成矿作用主要由玄武岩海解而析出铁质与细菌还原硫酸盐及分解有机硫所产生的H_2S作用,形成黄铁矿,生物一方面直接参与了成硫,另一方面又间接参与了成矿作用。The pyrite deposits of the Southwest sulfide zone mainly develop at the bottom of the Permian Longtan coal -series , which to a certain extent. has velation wilh the eruption of the Emeishan Basalt. Investigations of deposits by the author point out some biotexture -marked pyrites and framboidal pyrites. Under SEM and EPA examinations, framboidal aggeregate of pyrite enclosed within organisms is proved as a kind of frorn-boidal bocaend while biotextures of pyrite are caused by replacement. On the basis of the above studies, the authors describes a close correlation between the biotextures and the formation of the framboidal pyrite. To speak in detail, when basaltic erupted, flowed and reached sea basin, it decomposed right away in the presence of sea water and separated into a great number of ferruginous materials. These linked before long with the H2S produced through reduction of sulfate and decomposition of ogranic sulfur, all by bacterium, finally to form pyrite. In the course of later sedimento - diagnosis , framboidal sulfur bacterium were able to highly breed within buried organisms. In the meantime, if there existed a strongly reducing regime around the mi croorganisms. the S° of their bodies would react with the nearby Fe2-, HS- and FeS. This led not only tprecipitation of framboidal pyrites also to perfect preservation of the biotextures which featured them. From the above explanation, one can easily concludes that the pyrite of the study area its mineralization to the ferruginous influx related to decomposition of basalt by sea water and , what is more important. to activities of microorganisms and bacterium: one directly having a band in sulfur production and the other being responsible for sulfate reduction and, indirectly, for sulfur mineralization.

关 键 词：黄铁矿 生物 成矿作用 硫矿带 

分 类 号：P618.310.5[天文地球—矿床学]