2018
DOI: 10.1016/j.gca.2018.08.048
|View full text |Cite
|
Sign up to set email alerts
|

Dynamics of pyrite formation and organic matter sulfurization in organic-rich carbonate sediments

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
1
1
1
1

Citation Types

0
44
0

Year Published

2020
2020
2023
2023

Publication Types

Select...
5
2
2

Relationship

0
9

Authors

Journals

citations
Cited by 91 publications
(44 citation statements)
references
References 129 publications
0
44
0
Order By: Relevance
“…Isotopic differences between these sulfur species are the likely cause of differences in reported δ 34 S pyr values. Despite the effect of years of exposure to oxygen on the pyrite abundance, the negligible sulfur isotopic fractionation associated with aerobic oxidation of pyrite ( 72 ) allows interpretation of the sulfur isotopic variability preserved in the remaining pyrite as negligibly altered [e.g., ( 73 )].…”
Section: Methodsmentioning
confidence: 99%
“…Isotopic differences between these sulfur species are the likely cause of differences in reported δ 34 S pyr values. Despite the effect of years of exposure to oxygen on the pyrite abundance, the negligible sulfur isotopic fractionation associated with aerobic oxidation of pyrite ( 72 ) allows interpretation of the sulfur isotopic variability preserved in the remaining pyrite as negligibly altered [e.g., ( 73 )].…”
Section: Methodsmentioning
confidence: 99%
“…Pyrite that forms from a more slowly dissolving mineral will integrate values over a larger time/depth interval. As such, more 34 S-enriched Fe sulfides can indicate gradual release of Fe 2+ from a less reactive mineral (Bryant et al, 2019;Shawar et al, 2018). Inter- (Figure 4) and intra-grain ( Figures 5-8) observations show that the syn-OAE-2 sample features the largest proportion of 34 S-depleted material, while maintaining a large intra-sample δ 34 S range.…”
Section: Changing Fe Deliverymentioning
confidence: 95%
“…In a simplified framework with a constant isotopic fractionation during microbial sulfate reduction (εmic), the first Fe sulfide material to form in a partially closed system is expected to be the most 34 S-depleted, whereas the last-formed material should be the most 34 S-enriched due to the effects of Rayleigh distillation during sulfate reduction (Bryant et al, 2019;Jorgensen, 1979). In such a system, the primary controls on δ 34 SCRS values are (i) the magnitude of εmic, (ii) the openness of the system with respect to the diffusion of water column sulfate (Claypool, 2004), (iii) the total amount of Fe that could readily react with reduced S species to form Fe sulfides, and (iv) the relative rate/timing of the reactivity of Fe with reduced S species (Bryant et al, 2019;Fike et al, 2015;Poulton, 2003;Shawar et al, 2018). Additional factors of unknown importance for δ 34 SCRS are ambient pH and Eh, as these may affect the saturation state of different sulfide minerals in the system, and the operation of different Fe sulfide formation pathways (Benning et al, 2000;Murowchick and Barnes, 1986;Poulton, 2003;Rickard, 1975;Wan et al, 2017).…”
Section: The Possible Controls On δ 34 Scrsmentioning
confidence: 99%
“…Moreover, the presence of organic matter is related to the presence of pyrites (FeS 2), which is common in continental margin sediments: these marine anoxic conditions enable bacterial sulphate reduction from organic matter that later reacts with detrital iron minerals in the sediment to form pyrite (Berner 1970(Berner , 1982. Observations using SEM confirmed framboidal pyrite structures in the group of dark grey samples, whose presence in organic matter can be a result of microbial activity (Sawlowicz 2000;Shawar et al 2018).…”
Section: Discussionmentioning
confidence: 99%