Stable sulfur isotope partitioning during simulated petroleum formation as determined by hydrous pyrolysis of Ghareb Limestone, Israel

Amrani, Alon; Lewan, Michael D.; Aizenshtat, Zeev

doi:10.1016/j.gca.2005.06.026

Cited by 69 publications

(30 citation statements)

References 39 publications

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“…Additional modifications of OS can occur as the kerogen thermally matures and ages, but kerogen pyrolysis experiments conducted at 200-365°C [the same temperature range reached by the SPF stromatolites during metamorphism (10)] have revealed that these fractionations are small; i.e., <3‰ (40). Thus, fractionations associated with assimilatory biotic processes, abiotic sulfurization reactions, and thermal maturation can only account for δ 34 S variations of −5‰ to 8‰ with respect to ambient environmental sulfur, and do not explain the larger variations observed in the OS of the SPF stromatolites.…”

Section: Discussionmentioning

confidence: 99%

Sulfur isotopes of organic matter preserved in 3.45-billion-year-old stromatolites reveal microbial metabolism

Bontognali

Sessions

Allwood

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

141

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The 3.45-billion-year-old Strelley Pool Formation of Western Australia preserves stromatolites that are considered among the oldest evidence for life on Earth. In places of exceptional preservation, these stromatolites contain laminae rich in organic carbon, interpreted as the fossil remains of ancient microbial mats. To better understand the biogeochemistry of these rocks, we performed microscale in situ sulfur isotope measurements of the preserved organic sulfur, including both Δ 33 S and δ 34 S CDT . This approach allows us to tie physiological inference from isotope ratios directly to fossil biomass, providing a means to understand sulfur metabolism that is complimentary to, and independent from, inorganic proxies (e.g., pyrite). Δ 33 S values of the kerogen reveal mass-anomalous fractionations expected of the Archean sulfur cycle, whereas δ 34 S CDT values show large fractionations at very small spatial scales, including values below −15‰. We interpret these isotopic patterns as recording the process of sulfurization of organic matter by H 2 S in heterogeneous mat pore-waters influenced by respiratory S metabolism. Positive Δ 33 S anomalies suggest that disproportionation of elemental sulfur would have been a prominent microbial process in these communities.early life | biosignature | microbe | paleontology | ion probe

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Section: Discussionmentioning

confidence: 99%

Sulfur isotopes of organic matter preserved in 3.45-billion-year-old stromatolites reveal microbial metabolism

Bontognali

Sessions

Allwood

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

141

View full text Add to dashboard Cite

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“…The character of the kerogen used in the present study is described in Amrani et al (2005b). The asphalt and oil are operative definitions.…”

Section: Starting Compoundsmentioning

confidence: 99%

“…The kerogen contains two types of sulfur: (1) organic sulfur (95 wt%) with a d 34 S of +0.6& and (2) pyrite (5 wt%) with a very light d 34 S of À29.9&. Pyrite at this temperature is thermally stable (Seewald et al, 1994;Amrani et al, 2005b) but its aqueous solubility may contribute inorganic sulfur to solution (Seewald, 2001). However, the pyrite in our kerogen is coated with organic matter and thus somewhat protected from the surrounding water (Amrani et al, 2005b).…”

Section: Kerogen Asphalt and Oilmentioning

confidence: 99%

“…With increasing thermal maturation of the OM, structural and isotopic changes occur that coincide with massive release of sulfur, mainly as H 2 S (e.g. Idiz et al, 1990;Koopmans et al, 1998 ;Putschew et al, 1998;Amrani et al, 2005b). This thermally cleaved sulfur is chemically reactive and can re-react with the OM (Amrani and Aizenshtat, 2004c).…”

Section: Introductionmentioning

confidence: 99%

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Experiments on δ34S mixing between organic and inorganic sulfur species during thermal maturation

Amrani

Said-Ahamed

Lewan

et al. 2006

Geochimica et Cosmochimica Acta

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“…(P), Monterey Fm. (M), and Alum Shale (A) fromLewan and Ruble (2002), and a sample of the Ghareb Limestone (g) fromAmrani et al (2005).…”

mentioning

confidence: 99%

Oil-generation kinetics for organic facies with Type-II and -IIS kerogen in the Menilite Shales of the Polish Carpathians

Lewan

Kotarba

Curtis

et al. 2006

Geochimica et Cosmochimica Acta

106

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Stable sulfur isotope partitioning during simulated petroleum formation as determined by hydrous pyrolysis of Ghareb Limestone, Israel

Cited by 69 publications

References 39 publications

Sulfur isotopes of organic matter preserved in 3.45-billion-year-old stromatolites reveal microbial metabolism

Sulfur isotopes of organic matter preserved in 3.45-billion-year-old stromatolites reveal microbial metabolism

Experiments on δ34S mixing between organic and inorganic sulfur species during thermal maturation

Oil-generation kinetics for organic facies with Type-II and -IIS kerogen in the Menilite Shales of the Polish Carpathians

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