Hot-water Deposition and Microbiomineralization of Oolitic Pyrite

XIA Xue-hui; Ll Zhong-mo

Oolitic pyrite ores,a special ore-type,occur in the Gaobanhe massive sulfide deposit in the Proterozoic rift in the Yanshan region. The pyrite oolides have cores consisting of compacted trangular laminae,cemented by filamentous thermophilous microorganism,of sulfur-addicted bacteria and as many as 10-20 incrustations composed of pyrite and lesser galena. In the oolitic pyrite,there are 1.43%-2.59% of highly sapropelic organic materials,plenty of organism-marking materials, normalized iroamyl dialkene and methyl heptadecyl,and large amounts of phytane and pristane. The oolitic pyrite is similar to hot-water depositions of modern oceanic rifts with respect to its composition of micro and REE-elements, showing a bacterium or algae-built sedimentary texture under microscope. Further studies indicate these organisms were flourishing in a reduced environment colse to the vents of hot water on sea bdes,essentially because of the suspended regime caused by the vent pulsation. This regime helped the thermophilous microoganism to grow around the pyrite intraclasts and bacterial groups and to take up mineral materials from the vent hot water. In a word,a series of mechanisms including submar8ine ezhalation,vent pulsation,microorganic adsorption and reduction,and the lide contributed considerably to formation of the oolitic pyrite.

Geological Iustitute for Chemical Minerals, Zhuozhou,Hebei 072754

Received Date: 1999-06-30

Publish Date: 1999-12-10

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Abstract: Oolitic pyrite ores,a special ore-type,occur in the Gaobanhe massive sulfide deposit in the Proterozoic rift in the Yanshan region. The pyrite oolides have cores consisting of compacted trangular laminae,cemented by filamentous thermophilous microorganism,of sulfur-addicted bacteria and as many as 10-20 incrustations composed of pyrite and lesser galena. In the oolitic pyrite,there are 1.43%-2.59% of highly sapropelic organic materials,plenty of organism-marking materials, normalized iroamyl dialkene and methyl heptadecyl,and large amounts of phytane and pristane. The oolitic pyrite is similar to hot-water depositions of modern oceanic rifts with respect to its composition of micro and REE-elements, showing a bacterium or algae-built sedimentary texture under microscope. Further studies indicate these organisms were flourishing in a reduced environment colse to the vents of hot water on sea bdes,essentially because of the suspended regime caused by the vent pulsation. This regime helped the thermophilous microoganism to grow around the pyrite intraclasts and bacterial groups and to take up mineral materials from the vent hot water. In a word,a series of mechanisms including submar8ine ezhalation,vent pulsation,microorganic adsorption and reduction,and the lide contributed considerably to formation of the oolitic pyrite.

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Hot-water Deposition and Microbiomineralization of Oolitic Pyrite

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