Assessing bulk carbonates as archives for seawater Li isotope ratios

Silicate weathering is a primary control on the carbon cycle and therefore long-term climate. Tracing silicate weathering in the geological record has been a challenge for decades, with a number of proxies proposed and their limits determined. Recently lithium isotopes in marine carbonates have emer...

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Bibliographic Details
Published in:Chemical geology 2019-12, Vol.530, p.119338, Article 119338
Main Authors: Pogge von Strandmann, Philip A.E., Schmidt, Daniela N., Planavsky, Noah J., Wei, Guangyi, Jones, Chloe L.C., Baumann, Karl-Heinz
Format: Article
Language:English
Subjects:
Aragonite
Calcite
Carbonates
Lithium isotopes
Marine archives
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Summary:Silicate weathering is a primary control on the carbon cycle and therefore long-term climate. Tracing silicate weathering in the geological record has been a challenge for decades, with a number of proxies proposed and their limits determined. Recently lithium isotopes in marine carbonates have emerged as a potential tracer. Bulk carbonates are increasingly being used as a Li isotope archive, though with limited tests thus far of the robustness of this approach in the modern ocean. As the bulk composition of marine pelagic carbonates has changed through time and geographically, assessing the fidelity of bulk carbonate as proxy carrier is fundamental. To address the impact of compositional variability in bulk carbonate on Li isotopes, we examine 27 Bahamian aragonitic bulk carbonates and 16 Atlantic largely calcitic core-top sediment samples. Two core-tops only have trace (
ISSN:0009-2541
1872-6836
DOI:10.1016/j.chemgeo.2019.119338