Calcium Isotopic Compositions of Neogene Dolomites in the South China Sea and Its Implications for Paleoclimate Changes

Liu, Xiaofeng; Liu, Xiaoming; Zhai, Shikui; Cao, Cheng; Bi, Dongjie; Liu, Xingyu; Zhang, Zhaofeng

doi:10.1002/essoar.10506255.1

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“…In addition, we have performed a paired Ca and Mg isotope study on the same suite of samples, demonstrating these dolostones are "fluid-buffered" (Supplementary Fig. 2) 27 . A "fluid-buffered" environment refers to an open environment in which the chemical composition of carbonates will be overwhelmingly reset by that of the reacting fluid during diagenesis 12 .…”

Section: Resultsmentioning

confidence: 99%

“…This suite of dolostones has also been well studied using various geochemical indices including major and trace elements, rare earth elements, chemical compositions of fluid inclusions as well as C, O, Mg, Ca, and Sr isotopes, indicating that primary seawater signatures can be preserved [24][25][26][27] . First, we evaluate potential detrital contaminations using widely accepted geochemical indices.…”

Section: Resultsmentioning

confidence: 99%

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Dolostone as a reliable tracer of seawater lithium isotope composition

Liu

Wang

et al. 2023

Commun Earth Environ

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The lithium isotope composition (δ7Li) of seawater records important information on the evolution of the carbon and silicon cycles over geologic time. Here we report δ7Li values in a suite of Neogene dolostones (23–3.4 Ma, n = 39) from the South China Sea. Over the Neogene, dolostone δ7Li values have increased from 24.9‰ to 30.1‰, overlapping previously published foraminifera records and documenting seawater δ7Li without applying any isotopic fractionation factor correction. Our results suggest that fabric-retentive dolostones are good proxies for providing seawater δ7Li records even after early diagenesis. Importantly, these results provide a high-resolution dolostone record rather than a foraminifera record to confirm the observed ~5‰ increase in Neogene seawater δ7Li. We predict that early marine diagenetic dolostones with fabric textures abundant in the Proterozoic may record changes in seawater δ7Li and continental weathering, providing great insights into the Precambrian global carbon cycle.

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Section: Resultsmentioning

confidence: 99%