Local and global controls on carbon isotope chemostratigraphy

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Authors

Anne-Sofie Crüger Ahm , Jon M. Husson 

Abstract

Over million-year timescales, the geologic cycling of carbon controls long-term climate and the oxidation of Earth's surface. Inferences about the carbon cycle can be made from time series of carbon isotopic ratios measured from sedimentary rocks. The foundational assumption for carbon isotope chemostratigraphy is that carbon isotope values reflect dissolved inorganic carbon in a well-mixed ocean in equilibrium with the atmosphere. However, when applied to shallow-water platform environments, where most ancient carbonates preserved in the geological record formed, recent research has documented the importance of considering both local variability in surface water chemistry and diagenesis. These findings demonstrate that carbon isotope chemostratigraphy of platform carbonate rarely represent the average carbonate sink or records changes in the composition of global seawater. Understanding what causes local variability in shallow-water settings, and what this variability might reveal about global boundary conditions, are vital questions for the next generation of carbon isotope chemostratigraphers.

DOI

https://doi.org/10.31223/X5V607

Subjects

Earth Sciences

Keywords

global carbon cycle, carbon isotopes, chemostratigraphy, platform carbonates, carbonate diagenesis

Dates

Published: 2021-03-10 23:25

Last Updated: 2021-03-10 23:25

License

CC BY Attribution 4.0 International

Additional Metadata

Data Availability (Reason not available):
No original data is included in this paper.

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