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Marine Ooid Sizes Record Phanerozoic Seawater Carbonate Chemistry

Trower, Elizabeth J. and Smith, Benjamin P. and Koeshidayatullah, Ardiansyah I. and Payne, Jonathan L. (2022) Marine Ooid Sizes Record Phanerozoic Seawater Carbonate Chemistry. Geophysical Research Letters, 49 (22). Art. No. e2022GL100800. ISSN 0094-8276. doi:10.1029/2022gl100800.

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Seawater carbonate chemistry links Earth's climate and carbon cycle through the production and preservation of carbonate sediments. Models and carbonate facies abundance records have generated hypotheses about trajectories of seawater carbonate chemistry, including responses to key events in the evolutionary history of carbonate biomineralizers. However, tests of these hypotheses have remained elusive. We applied a novel proxy for the carbonate mineral saturation state (Ω) of seawater based on the diameters of ooids—concentrically-coated carbonate sand grains—to estimate Ω, dissolved inorganic carbon, alkalinity, and pH of seawater spanning Phanerozoic time. Reconstructed Ω values decreased sharply around ∼120 Ma, which we interpret as the fingerprint of the Mid-Mesozoic Revolution of planktic calcifiers. Shifts in Ω across Ordovician time also suggest a possible causal relationship with the Great Ordovician Biodiversification Event. Our results demonstrate that ooid sizes are a useful tool for reconstructing Earth's ancient carbon cycle.

Item Type:Article
Related URLs:
URLURL TypeDescription
Trower, Elizabeth J.0000-0001-9898-5589
Smith, Benjamin P.0000-0003-3189-8717
Koeshidayatullah, Ardiansyah I.0000-0003-0940-678X
Payne, Jonathan L.0000-0002-9601-3310
Additional Information:The authors thank Shaily Rahman, Rowan Martindale, Benjamin Barnes, and Giovanni Aloisi for helpful discussion. The authors declare no funding sources.
Issue or Number:22
Record Number:CaltechAUTHORS:20221219-417430800.20
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:118494
Deposited By: Research Services Depository
Deposited On:20 Jan 2023 21:28
Last Modified:22 Jan 2023 21:01

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