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Variability in Sulfur Isotope Records of Phanerozoic Seawater Sulfate

Present, Theodore M. and Adkins, Jess F. and Fischer, Woodward W. (2020) Variability in Sulfur Isotope Records of Phanerozoic Seawater Sulfate. Geophysical Research Letters, 47 (18). Art. No. e2020GL088766. ISSN 0094-8276.

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The δ³⁴S of seawater sulfate reflects processes operating at the nexus of sulfur, carbon, and oxygen cycles. However, knowledge of past seawater sulfate δ³⁴S values must be derived from proxy materials that are impacted differently by depositional and postdepositional processes. We produced new time series estimates for the δ³⁴S value of seawater sulfate by combining 6,710 published data from three sedimentary archives—marine barite, evaporites, and carbonate‐associated sulfate—with updated age constraints on the deposits. Robust features in multiple records capture temporal trends in the δ³⁴S value of seawater and its interplay with other Phanerozoic geochemical and stratigraphic trends. However, high‐frequency discordances indicate that each record is differentially prone to depositional biases and diagenetic overprints. The amount of noise, quantified from the variograms of each record, increases with age for all δ³⁴S proxies, indicating that postdepositional processes obscure detailed knowledge of seawater sulfate's δ³⁴S value deeper in time.

Item Type:Article
Related URLs:
URLURL TypeDescription ItemCompiled Data Paper
Present, Theodore M.0000-0002-4747-2174
Adkins, Jess F.0000-0002-3174-5190
Fischer, Woodward W.0000-0002-8836-3054
Additional Information:© 2020 American Geophysical Union. Issue Online: 17 September 2020; Version of Record online: 17 September 2020; Accepted manuscript online: 02 September 2020; Manuscript accepted: 29 August 2020; Manuscript revised: 27 August 2020; Manuscript received: 14 May 2020. We thank Caltech DocuServe for obtaining many of the publications containing the compiled data, and John Grotzinger and Joe Kirschvink for thoughtful advising and feedback. Constructive reviews by Akshay Mehra and Julia Wilcots were greatly appreciated. Data Availability Statement: No new data were collected for this study. Data sets compiled for this research are tabulated in the supporting information and referenced below, and the compiled data are deposited in a freely accessible Open Science Framework repository available in Present et al. (2020).
Subject Keywords:Phanerozoic seawater composition; marine sulfate proxies; carbonate-associated sulfate; evaporites; barite; sulfur isotope ratios; kriging
Issue or Number:18
Record Number:CaltechAUTHORS:20200911-133129558
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Official Citation:Present, T. M., Adkins, J. F., & Fischer, W. W. (2020). Variability in sulfur isotope records of Phanerozoic seawater sulfate. Geophysical Research Letters, 47, e2020GL088766.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105327
Deposited By: George Porter
Deposited On:15 Sep 2020 21:12
Last Modified:02 Jun 2021 20:02

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