The geologic history of seawater oxygen isotopes from marine iron oxides

Science
Nir GaliliItay Halevy

Abstract

The oxygen isotope composition (δ18O) of marine sedimentary rocks has increased by 10 to 15 per mil since Archean time. Interpretation of this trend is hindered by the dual control of temperature and fluid δ18O on the rocks' isotopic composition. A new δ18O record in marine iron oxides covering the past ~2000 million years shows a similar secular rise. Iron oxide precipitation experiments reveal a weakly temperature-dependent iron oxide-water oxygen isotope fractionation, suggesting that increasing seawater δ18O over time was the primary cause of the long-term rise in δ18O values of marine precipitates. The 18O enrichment may have been driven by an increase in terrestrial sediment cover, a change in the proportion of high- and low-temperature crustal alteration, or a combination of these and other factors.

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Citations

Oct 31, 2019·Nature Communications·B A KillingsworthS V Lalonde
Jun 18, 2020·Proceedings of the National Academy of Sciences of the United States of America·Benjamin M TutoloNicholas J Tosca
Mar 7, 2020·Science Advances·David C Catling, Kevin J Zahnle
Oct 25, 2020·Scientific Reports·Pierre CadeauMagali Ader
Feb 3, 2021·Proceedings of the National Academy of Sciences of the United States of America·Samuel L GoldbergKristin D Bergmann
Jun 3, 2021·Proceedings of the National Academy of Sciences of the United States of America·Daniel HerwartzThorsten J Nagel
Jul 16, 2021·Nature·Boriana Kalderon-AsaelPhilip A E Pogge von Strandmann

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