WebSep 20, 2024 · The positive S-isotopic excursion of carbonate-associated sulfate (δ 34 S CAS) is generally in phase with the Steptoean positive carbon isotope excursion (SPICE), which may reflect widespread, global, transient increases in the burial of organic carbon and pyrite sulfate in sediments deposited under large-scale anoxic and sulphidic … Web摘要: A combination of evidence from mineralogy, sulfur and oxygen stable isotope ratios from early diagenetic carbonate associated sulfate (CAS) and structurally substituted …
Sulfur isotope fractionation between aqueous and carbonate-associated …
WebLate Devonian marine deposits in the Western Canada Sedimentary Basin were analyzed for (1) accumulations of bioproductivity and paleoredox trace element proxies and for (2) variations of δ13C(carb and org) and δ15Norg in order to understand and interpret the regional history of the global yet short-term ‘punctata Event’ geochemical perturbation. WebCarbonate-associated sulfate (CAS) in bulk marine carbonate and biogenic calcite is widely used to reconstruct the primary sea-water sulfate S isotope composition during major redox perturba-tions of the Earth surface system (9 –13). Seawater sulfate 34S is dynamically controlled by variations in the fluxes and isoto- hilbert college student portal
A carbonate-based proxy for sulfate-driven anaerobic …
Webof diagenesis are generally thought to be small though not insignificant (Banner and Hanson, 1990; Marshall, 1992). The effects of diagenesis, in particular early marine … WebOct 1, 2008 · @article{Gill2008BehaviorOC, title={Behavior of carbonate-associated sulfate during meteoric diagenesis and implications for the sulfur isotope paleoproxy}, author={Benjamin C Gill and Timothy W. Lyons and Tracy D. Frank}, journal={Geochimica et Cosmochimica Acta}, year={2008}, volume={72}, pages={4699-4711} } WebApr 13, 2024 · Banded iron-formations (BIFs) are marine chemical sedimentary rocks composed of siliceous and ferric materials, usually with typical thin layers or sheet structures. BIFs not only record a wealth of information about the state and evolution of the lithosphere, atmosphere, hydrosphere, and biosphere but also host the majority of the … smallpox victims pictures