| _version_ | 1867171877297848320 |
|---|---|
| author | Pasquier, Virgil Fike, David A Halevy, Itay |
| author_facet | Pasquier, Virgil Fike, David A Halevy, Itay |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Understanding variation in the sulfur isotopic composition of sedimentary pyrite (δ34Spyr) is motivated by the key role of sulfur biogeochemistry in regulating Earth's surface oxidation state. Until recently, the impact of local depositional conditions on δ34Spyr has remained underappreciated, and stratigraphic variations in δ34Spyr were interpreted mostly to reflect global changes in biogeochemical cycling. We present two coeval δ34Spyr records from shelf and basin settings in a single sedimentary system. Despite their proximity and contemporaneous deposition, these two records preserve radically different geochemical signals. Swings of ~65‰ in shelf δ34Spyr track short-term variations in local sedimentation and are completely absent from the abyssal record. In contrast, a long-term ~30‰ decrease in abyssal δ34Spyr reflects regional changes in ocean circulation and/or sustained pyrite formation. These results highlight strong local controls on δ34Spyr, calling for reevaluation of the current practice of using δ34Spyr stratigraphic variations to infer global changes in Earth's surface environment. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_937620 |
| institution | PANGAEA |
| language | en |
| publishDate | 2026 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Strong local, not global, controls on marine pyrite sulfur isotopes Pasquier, Virgil Fike, David A Halevy, Itay 181-1123; 317-U1352; Age; AGE; Calcium carbonate; Canterbury Basin; Carbon, organic, total; COMPCORE; Composite Core; Event label; Exp317; Glacial – Interglacial; Iron disulfide; Joides Resolution; Leg181; Local processes; Nitrogen, total; pyrite; Size fraction 0.500-0.100 mm; South Pacific Ocean; Δ Pyrite; δ13C, organic carbon; δ15N; δ34S; δ34S, pyrite Understanding variation in the sulfur isotopic composition of sedimentary pyrite (δ34Spyr) is motivated by the key role of sulfur biogeochemistry in regulating Earth's surface oxidation state. Until recently, the impact of local depositional conditions on δ34Spyr has remained underappreciated, and stratigraphic variations in δ34Spyr were interpreted mostly to reflect global changes in biogeochemical cycling. We present two coeval δ34Spyr records from shelf and basin settings in a single sedimentary system. Despite their proximity and contemporaneous deposition, these two records preserve radically different geochemical signals. Swings of ~65‰ in shelf δ34Spyr track short-term variations in local sedimentation and are completely absent from the abyssal record. In contrast, a long-term ~30‰ decrease in abyssal δ34Spyr reflects regional changes in ocean circulation and/or sustained pyrite formation. These results highlight strong local controls on δ34Spyr, calling for reevaluation of the current practice of using δ34Spyr stratigraphic variations to infer global changes in Earth's surface environment. |
| title | Strong local, not global, controls on marine pyrite sulfur isotopes |
| topic | 181-1123; 317-U1352; Age; AGE; Calcium carbonate; Canterbury Basin; Carbon, organic, total; COMPCORE; Composite Core; Event label; Exp317; Glacial – Interglacial; Iron disulfide; Joides Resolution; Leg181; Local processes; Nitrogen, total; pyrite; Size fraction 0.500-0.100 mm; South Pacific Ocean; Δ Pyrite; δ13C, organic carbon; δ15N; δ34S; δ34S, pyrite |
| url | https://doi.org/10.1594/PANGAEA.937620 |