硫黄
成岩作用
有机质
化学
环境化学
δ34S
同位素位移
同位素
同位素分析
干酪根
硫同位素
硫化物
稳定同位素比值
地质学
矿物学
有机化学
烃源岩
构造盆地
海洋学
古生物学
生物化学
物理
氨基酸
量子力学
蛋氨酸
流体包裹体
石英
作者
Josef P. Werne,Timothy W. Lyons,David J. Hollander,Stefan Schouten,Ellen C. Hopmans,Jaap S. Sinninghe Damsté
标识
DOI:10.1016/j.gca.2008.04.033
摘要
We present the results of compound-specific sulfur isotope analyses performed on organic sulfur compounds (OSCs) isolated from sediments deposited in the euxinic Cariaco Basin, Venezuela. Individual OSCs (sulfurized highly branched isoprenoids and malabaricatriene) have sulfur isotope compositions of ca. −15‰, which is 34S enriched by 5–15‰ relative to coeval bulk organic and inorganic sulfur pools. These observed differences in the sulfur isotope composition of bulk organic sulfur in the kerogen and bitumen pools and individual OSCs demonstrate that there are multiple pathways of organic sulfur formation operating simultaneously in marine sediments. Comparison of our measured compound-specific sulfur isotope data with values predicted using simple isotopic mass balance assumptions suggests that the sulfurization process likely involves multiple sources of inorganic sulfur. Further, the isotopic composition of these various precursor inorganic sulfur species and the specific pathway of sulfur incorporation into organic matter (OM) impart distinct isotopic compositions to the resulting organic sulfur compounds. These data represent the first compound-specific sulfur isotope measurements made in marine sediments, and demonstrate the utility of compound-specific sulfur isotope analysis in identification of inorganic sulfur sources for OM sulfurization and tracking pathways of sulfur incorporation, which will lead to a more complete understanding of diagenetic sulfurization of OM.
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