黄铁矿叠层石丘堆式沉积与块状硫化物的富集作用

MOUND TYPE DEPOSITION OF PYRITIC STROMATOLITE AND ENRICHMENT OF MASSIVE SULFIDE

通过对黄铁矿叠层石组构、成分、微量元素、硫同位素、分子生物标志物与产出的构造环境背景的研究可知 ,黄铁矿叠层石的形成是通过沿同生断裂上升喷溢入海的热流体长期脉动作用 ,构成栖息在热水喷口与热液丘堤周围的嗜热微生物群落生存的食物链基础 ,使嗜热微生物围绕热水喷口繁殖的结果。沿同生断裂上升喷溢入海的热流体长期脉动过程中不断吸附、富集成矿元素 ,并将海水中的硫酸盐还原为H2 S。微生物吸附的Fe2 + 与S2 -作用 ,形成黄铁矿叠层石。微生物群落在热水喷口与丘堤附近不均衡发展 ,产生了成矿带内块状硫化物矿床中的黄铁矿叠层石丘堆。这种黄铁矿叠层石丘堆体是寻找富矿的显著标志 。

Through research on fabric,cimponents,microelements,sulfurisotope,molecular biological marker and productive structural environmental background of pyritic stromatolite,may be known that genesis of pyritic stranatolite.Because of long pulse process of thermal flow body which roes and into the sea along connate fracture,make up food Chain basis of Thermothirsty microbes which dwelled and bred around spray opening and hydrothermal mound.The thermal flow body rose and into sea along connate fracture uninterrupted adsorbed and enriched minerogenetic elements during long pulse process, and reduced sulfosalt of sea water into H 2S.The microbes adsorbde Fe 2+ and S 2- ,and caused to form pyritic stromatolite.Unbalance developmint of microbes near by spray opening of thermal water and mound, lead to produce pyritic stromatolite mound in the massive sulfide deposit of minerogenic zone.the mound body of pyritic stromatolite is a notable mark of rich-ore search,so there are important significances..