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Uranium isotope fractionation in non‐sulfidic anoxic settings and the global uranium isotope mass balance

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Uranium isotope fractionation in non‐sulfidic anoxic settings and the global uranium isotope mass balance. / Cole, Devon B.; Planavsky, Noah J.; Longley, Martha; Böning, Philipp; Wilkes, Daniel; Wang, Xiangli; Swanner, Elizabeth D.; Wittkop, Chad; Loydell, David; Busigny, Vincent; Knudsen, Andrew; Sperling, Erik A.

In: Global Biogeochemical Cycles, 24.06.2020.

Research output: Contribution to journalArticle

Harvard

Cole, DB, Planavsky, NJ, Longley, M, Böning, P, Wilkes, D, Wang, X, Swanner, ED, Wittkop, C, Loydell, D, Busigny, V, Knudsen, A & Sperling, EA 2020, 'Uranium isotope fractionation in non‐sulfidic anoxic settings and the global uranium isotope mass balance', Global Biogeochemical Cycles. https://doi.org/10.1029/2020GB006649

APA

Cole, D. B., Planavsky, N. J., Longley, M., Böning, P., Wilkes, D., Wang, X., Swanner, E. D., Wittkop, C., Loydell, D., Busigny, V., Knudsen, A., & Sperling, E. A. (2020). Uranium isotope fractionation in non‐sulfidic anoxic settings and the global uranium isotope mass balance. Global Biogeochemical Cycles. https://doi.org/10.1029/2020GB006649

Vancouver

Cole DB, Planavsky NJ, Longley M, Böning P, Wilkes D, Wang X et al. Uranium isotope fractionation in non‐sulfidic anoxic settings and the global uranium isotope mass balance. Global Biogeochemical Cycles. 2020 Jun 24. https://doi.org/10.1029/2020GB006649

Author

Cole, Devon B. ; Planavsky, Noah J. ; Longley, Martha ; Böning, Philipp ; Wilkes, Daniel ; Wang, Xiangli ; Swanner, Elizabeth D. ; Wittkop, Chad ; Loydell, David ; Busigny, Vincent ; Knudsen, Andrew ; Sperling, Erik A. / Uranium isotope fractionation in non‐sulfidic anoxic settings and the global uranium isotope mass balance. In: Global Biogeochemical Cycles. 2020.

Bibtex

@article{23a33eb0c3e2470bb76eb3b4bc18757c,
title = "Uranium isotope fractionation in non‐sulfidic anoxic settings and the global uranium isotope mass balance",
abstract = "Uranium isotopes (238U/235U) have been used widely over the last decade as a global proxy for marine redox conditions. The largest isotopic fractionations in the system occur during U reduction, removal and burial. Applying this basic framework, global U isotope mass balance models have been used to predict the extent of ocean floor anoxia during key intervals throughout Earth{\textquoteright}s history. However, there are currently minimal constraints on the isotopic fractionation that occurs during reduction and burial in anoxic and iron‐rich (ferruginous) aquatic systems, despite the consensus that ferruginous conditions are thought to have been widespread through the majority of our planet{\textquoteright}s history. Here we provide the first exploration of δ238U values in natural ferruginous settings. We measured δ238U in sediments from two modern ferruginous lakes (Brownie Lake and Lake Pavin), the water column of Brownie Lake, and sedimentary rocks from the Silurian‐Devonian boundary that were deposited under ferruginous conditions. Additionally, we provide new δ238U data from core top sediments from anoxic but non‐sulfidic settings in the Peru Margin oxygen minimum zone. We find that δ238U values from sediments deposited in all of these localities are highly variable, but on average are indistinguishable from adjacent oxic sediments. This forces a reevaluation of the global U isotope mass balance and how U isotope values are used to reconstruct the evolution of the marine redox landscape.",
keywords = "Redox, Uranium, Isotopes, Ferruginous",
author = "Cole, {Devon B.} and Planavsky, {Noah J.} and Martha Longley and Philipp B{\"o}ning and Daniel Wilkes and Xiangli Wang and Swanner, {Elizabeth D.} and Chad Wittkop and David Loydell and Vincent Busigny and Andrew Knudsen and Sperling, {Erik A.}",
year = "2020",
month = jun,
day = "24",
doi = "10.1029/2020GB006649",
language = "English",
journal = "Global Biogeochemical Cycles",
issn = "0886-6236",
publisher = "American Geophysical Union",

}

RIS

TY - JOUR

T1 - Uranium isotope fractionation in non‐sulfidic anoxic settings and the global uranium isotope mass balance

AU - Cole, Devon B.

AU - Planavsky, Noah J.

AU - Longley, Martha

AU - Böning, Philipp

AU - Wilkes, Daniel

AU - Wang, Xiangli

AU - Swanner, Elizabeth D.

AU - Wittkop, Chad

AU - Loydell, David

AU - Busigny, Vincent

AU - Knudsen, Andrew

AU - Sperling, Erik A.

PY - 2020/6/24

Y1 - 2020/6/24

N2 - Uranium isotopes (238U/235U) have been used widely over the last decade as a global proxy for marine redox conditions. The largest isotopic fractionations in the system occur during U reduction, removal and burial. Applying this basic framework, global U isotope mass balance models have been used to predict the extent of ocean floor anoxia during key intervals throughout Earth’s history. However, there are currently minimal constraints on the isotopic fractionation that occurs during reduction and burial in anoxic and iron‐rich (ferruginous) aquatic systems, despite the consensus that ferruginous conditions are thought to have been widespread through the majority of our planet’s history. Here we provide the first exploration of δ238U values in natural ferruginous settings. We measured δ238U in sediments from two modern ferruginous lakes (Brownie Lake and Lake Pavin), the water column of Brownie Lake, and sedimentary rocks from the Silurian‐Devonian boundary that were deposited under ferruginous conditions. Additionally, we provide new δ238U data from core top sediments from anoxic but non‐sulfidic settings in the Peru Margin oxygen minimum zone. We find that δ238U values from sediments deposited in all of these localities are highly variable, but on average are indistinguishable from adjacent oxic sediments. This forces a reevaluation of the global U isotope mass balance and how U isotope values are used to reconstruct the evolution of the marine redox landscape.

AB - Uranium isotopes (238U/235U) have been used widely over the last decade as a global proxy for marine redox conditions. The largest isotopic fractionations in the system occur during U reduction, removal and burial. Applying this basic framework, global U isotope mass balance models have been used to predict the extent of ocean floor anoxia during key intervals throughout Earth’s history. However, there are currently minimal constraints on the isotopic fractionation that occurs during reduction and burial in anoxic and iron‐rich (ferruginous) aquatic systems, despite the consensus that ferruginous conditions are thought to have been widespread through the majority of our planet’s history. Here we provide the first exploration of δ238U values in natural ferruginous settings. We measured δ238U in sediments from two modern ferruginous lakes (Brownie Lake and Lake Pavin), the water column of Brownie Lake, and sedimentary rocks from the Silurian‐Devonian boundary that were deposited under ferruginous conditions. Additionally, we provide new δ238U data from core top sediments from anoxic but non‐sulfidic settings in the Peru Margin oxygen minimum zone. We find that δ238U values from sediments deposited in all of these localities are highly variable, but on average are indistinguishable from adjacent oxic sediments. This forces a reevaluation of the global U isotope mass balance and how U isotope values are used to reconstruct the evolution of the marine redox landscape.

KW - Redox

KW - Uranium

KW - Isotopes

KW - Ferruginous

UR - https://onlinelibrary.wiley.com/doi/abs/10.1029/2020GB006649

U2 - 10.1029/2020GB006649

DO - 10.1029/2020GB006649

M3 - Article

JO - Global Biogeochemical Cycles

JF - Global Biogeochemical Cycles

SN - 0886-6236

ER -

ID: 21426336