Title: Pyrite Formation and Its Controls in Black Shales of the Buxin Formation(Lower Eocene) from the Sanshui Basin,Guangdong
Abstract:Analyses of TOC/S,TOC/DOP,S/Fe relationships and S-TOC-Femultiple linear regression were carried out to determine limiting factors for pyrite formation in black shales of the Honggang Member(Lower Eoc...Analyses of TOC/S,TOC/DOP,S/Fe relationships and S-TOC-Femultiple linear regression were carried out to determine limiting factors for pyrite formation in black shales of the Honggang Member(Lower Eocene Bu-xin Formation) in the Sanshui Basin.Submember A,showing lower organic carbon and higher iron contents than the other submembers,deposited in oxygenated bottom waters.Bacterial sulfate reduction took place below the sediment-water interface,and pyrite was formed diagenetically and organic carbon was limited.Submember B and C are characterized by large variations in organic carbon content.Organic-rich(TOC4%) rocks deposited under anoxic environments,in which H_(2)S presented above the sediment water interface as well as within the sediments.Pyrite was formed syngenetically and confined by the duration during which iron detritus reacted with H_(2)S in the water column and by the availability of dissolved sulfate that decreased due to an increasing input of fresh waters.For organic-poor(TOC4%) sediments,pyrite was of syngenetic and diagenetic.Organic carbon-limited diagenetic pyrite added to the earlier formed syngenetic pyrite,which was controlled by the time that iron minerals remained in contact with H_(2)S in anoxic waters.Read More
Publication Year: 2006
Publication Date: 2006-01-01
Language: en
Type: article
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Cited By Count: 3
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