Impact of sedimentation, climate and sea level on marine sedimentary pyrite sulfur isotopes: Insights from the Valle di Manche section (Lower-Middle Pleistocene, southern Italy)

Major sulfur cycle perturbations in the Panthalassic Ocean across the Pliensbachian-Toarcian boundary and the Toarcian Oceanic Anoxic Event

“…However, recent work has shown that local/regional factors can act as significant, and perhaps dominant, controls on δ 34 S pyrite in marine sediments (e.g. Fry et al, 1988;Canfield, 1991;Leavitt et al, 2013;Pasquier et al, 2017Pasquier et al, , 2021Lang et al, 2020;Liu et al, 2021;Houghton et al, 2022). As such, the interpretation of δ 34 S pyrite records demands careful evaluation of both local and global drivers of marine sulfur cycling.…”

“…Higher sedimentation rates can also increase the supply of highly reactive iron to the sediment relative to organic matter and sulfate, ensuring more efficient trapping of dissolved hydrogen sulfide as solid iron sulfides (Liu et al, 2021). Both these effects result in increases in δ 34 S pyrite via more closed system behavior at higher sedimentation rates (Canfield, 1991;Pasquier et al, 2017Pasquier et al, , 2021Liu et al, 2019;Liu et al, 2021;Houghton et al, 2022).…”

“…Records of δ 34 S pyrite can, however, be influenced by factors unrelated to redox and that instead provide insights into the nature of (and changes to) depositional conditions (e.g. Pasquier et al, 2021;Houghton et al, 2022).…”

Formation of mixed-layer sulfide-hydroxide minerals from the Tochilinite-Valleriite group during experimental serpentinization of olivine

“…The olivine and FeS used as reactants were combusted with a Costech ECS 4010 Elemental Analyzer and the products measured using thermal conductivity for sulfur abundance and using IRMS for sulfur isotopic composition. After completion of the experiments, remaining sulfate minerals were removed from the solid products and the chromium-reducible sulfur (CRS) component of the solids was extracted and purified as silver sulfide following methods described in Houghton et al (2022). The isotopic composition of the silver sulfide yield was analyzed by IRMS using the same calibration methods as the 34 S-labeled barium sulfate precipitates.…”

Depositional control on the sulfur content and isotope of sedimentary pyrite from the southeast coast of China since MIS5

“…During the sulfate reduction process, microbes preferentially utilize the isotopically lighter sulfur in sulfate to produce sulfides, so the produced pyrite is depleted in 34 S relative to the initial sulfate, resulting in a large sulfur isotopic fractionation (Jørgensen, 1982;Habicht and Canfield, 1997). In spite of the control of microbial metabolism, recent studies have suggested that the sulfur isotopic composition of pyrite (d 34 S py ) is also affected by local depositional factors (Lang et al, 2020;Houghton et al, 2021;Liu et al, 2021a), which could be preserved in the sedimentary record. For example, recent studies showed that the high sedimentation rates are conducive to the formation of the relative "closed" diagenetic system, leading to the formation of isotopically "heavy" pyrite (Pasquier et al, 2017;Liu et al, 2019).…”