A revised seawater sulfate S-isotope curve for the Eocene

Weiqi Yao; Adina Paytan; Elizabeth M. Griffith; Francisca Martínez-Ruiz; Stefan Markovic; Ulrich G. Wortmann

doi:10.1016/j.chemgeo.2019.119382

A revised seawater sulfate S-isotope curve for the Eocene

Weiqi Yao, Adina Paytan, Elizabeth M. Griffith, Francisca Martínez-Ruiz, Stefan Markovic, Ulrich G. Wortmann

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

The sulfur isotope ratio (δ³⁴S) recorded in marine barite is commonly used to estimate secular changes in the sulfur isotopic composition of seawater sulfate (δ³⁴S_SO4) throughout Earth's history. The Cenozoic record demonstrates a drastic 5‰ increase in seawater δ³⁴S_SO4 during the Early Eocene. However, the gradient of this excursion is based on only a few data points. Taking advantage of a much improved biostratigraphic framework, we redefine the Eocene δ³⁴S_SO4 data with a new high-resolution barite based δ³⁴S record between 60 and 30 Ma. Our results show that the rise of δ³⁴S_SO4 starts about 3 million years later (~53 Ma) and lasts about 9 million years longer (until 38 Ma) than previously depicted. As such, the gradient of the δ³⁴S curve is ~0.4‰/Myr. The radiogenic strontium isotopic ratio in barite suggests that some of the samples used for the original barite record are affected by diagenetic alteration.

Original language	English
Article number	119382
Journal	Chemical Geology
Volume	532
DOIs	https://doi.org/10.1016/j.chemgeo.2019.119382
State	Published - 20 Jan 2020
Externally published	Yes

Keywords

Barite
Marine diagenesis
Sulfate
Sulfur isotope

ASJC Scopus subject areas

Geology
Geochemistry and Petrology

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10.1016/j.chemgeo.2019.119382

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title = "A revised seawater sulfate S-isotope curve for the Eocene",

abstract = "The sulfur isotope ratio (δ34S) recorded in marine barite is commonly used to estimate secular changes in the sulfur isotopic composition of seawater sulfate (δ34SSO4) throughout Earth's history. The Cenozoic record demonstrates a drastic 5‰ increase in seawater δ34SSO4 during the Early Eocene. However, the gradient of this excursion is based on only a few data points. Taking advantage of a much improved biostratigraphic framework, we redefine the Eocene δ34SSO4 data with a new high-resolution barite based δ34S record between 60 and 30 Ma. Our results show that the rise of δ34SSO4 starts about 3 million years later (~53 Ma) and lasts about 9 million years longer (until 38 Ma) than previously depicted. As such, the gradient of the δ34S curve is ~0.4‰/Myr. The radiogenic strontium isotopic ratio in barite suggests that some of the samples used for the original barite record are affected by diagenetic alteration.",

keywords = "Barite, Marine diagenesis, Sulfate, Sulfur isotope",

author = "Weiqi Yao and Adina Paytan and Griffith, {Elizabeth M.} and Francisca Mart{\'i}nez-Ruiz and Stefan Markovic and Wortmann, {Ulrich G.}",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2020",

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day = "20",

doi = "10.1016/j.chemgeo.2019.119382",

language = "English",

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T1 - A revised seawater sulfate S-isotope curve for the Eocene

AU - Yao, Weiqi

AU - Paytan, Adina

AU - Griffith, Elizabeth M.

AU - Martínez-Ruiz, Francisca

AU - Markovic, Stefan

AU - Wortmann, Ulrich G.

PY - 2020/1/20

Y1 - 2020/1/20

N2 - The sulfur isotope ratio (δ34S) recorded in marine barite is commonly used to estimate secular changes in the sulfur isotopic composition of seawater sulfate (δ34SSO4) throughout Earth's history. The Cenozoic record demonstrates a drastic 5‰ increase in seawater δ34SSO4 during the Early Eocene. However, the gradient of this excursion is based on only a few data points. Taking advantage of a much improved biostratigraphic framework, we redefine the Eocene δ34SSO4 data with a new high-resolution barite based δ34S record between 60 and 30 Ma. Our results show that the rise of δ34SSO4 starts about 3 million years later (~53 Ma) and lasts about 9 million years longer (until 38 Ma) than previously depicted. As such, the gradient of the δ34S curve is ~0.4‰/Myr. The radiogenic strontium isotopic ratio in barite suggests that some of the samples used for the original barite record are affected by diagenetic alteration.

AB - The sulfur isotope ratio (δ34S) recorded in marine barite is commonly used to estimate secular changes in the sulfur isotopic composition of seawater sulfate (δ34SSO4) throughout Earth's history. The Cenozoic record demonstrates a drastic 5‰ increase in seawater δ34SSO4 during the Early Eocene. However, the gradient of this excursion is based on only a few data points. Taking advantage of a much improved biostratigraphic framework, we redefine the Eocene δ34SSO4 data with a new high-resolution barite based δ34S record between 60 and 30 Ma. Our results show that the rise of δ34SSO4 starts about 3 million years later (~53 Ma) and lasts about 9 million years longer (until 38 Ma) than previously depicted. As such, the gradient of the δ34S curve is ~0.4‰/Myr. The radiogenic strontium isotopic ratio in barite suggests that some of the samples used for the original barite record are affected by diagenetic alteration.

KW - Barite

KW - Marine diagenesis

KW - Sulfate

KW - Sulfur isotope

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DO - 10.1016/j.chemgeo.2019.119382

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SN - 0009-2541

VL - 532

JO - Chemical Geology

JF - Chemical Geology

M1 - 119382

ER -

A revised seawater sulfate S-isotope curve for the Eocene

Abstract

Keywords

ASJC Scopus subject areas

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