Evolutionary Lineages of Alkenones Recorded in Cretaceous and Paleocene Sediments From the Transkei Basin (Iodp Site U1581)

Brassell, Simon; Bijl, Peter; Wagner, Thomas; Herrle, Jens; Uenzelmann-Neben, Gabriele; Bohaty, Steven; Childress, Laurel; ,; Doiron, Kelsey

doi:10.7185/gold2023.20482

Goldschmidt2023 Abstracts 2023

DOI: 10.7185/gold2023.20482

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Evolutionary Lineages of Alkenones Recorded in Cretaceous and Paleocene Sediments From the Transkei Basin (Iodp Site U1581)

Simon Brassell,

Peter Bijl,

Thomas Wagner

et al.

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2024

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Alkenone-derived estimates of Cretaceous pCO2

Si,

Novak,

Richter

et al. 2024

Geology

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Alkenones are long-chain ketones produced by phytoplankton of the order Isochrysidales. They are widely used in reconstructing past sea surface temperatures, benefiting from their ubiquitous occurrence in the Cenozoic ocean. Carbon isotope fractionation (εp) between alkenones and dissolved inorganic carbon may also be used as a proxy for past atmospheric pCO2 and has provided continuous pCO2 estimates back to ca. 45 Ma. Here, an extended occurrence of alkenones from ca. 130 Ma is reported. We characterize the molecular structure and distribution of these Mesozoic alkenones and evaluate their potential phylogenetic relationship with Cenozoic alkenones. Using δ13C values of the C37 methyl alkenone (C37:2Me), the first alkenone-based pCO2 estimates for the Mesozoic are derived. These estimates suggest elevated pCO2 with a range of 548−4090 ppm (908 ppm median) during the super-greenhouse climate of the Early Cretaceous, in agreement with phytane-based pCO2 reconstructions. Finally, insights into the identity of the Cretaceous coccolithophores that possibly synthesized alkenones are also offered.

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Alkenone-derived estimates of Cretaceous pCO2

Si,

Novak,

Richter

et al. 2024

Geology

View full text Add to dashboard Cite

show abstract

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Evolutionary Lineages of Alkenones Recorded in Cretaceous and Paleocene Sediments From the Transkei Basin (Iodp Site U1581)

Cited by 1 publication

References 8 publications

Alkenone-derived estimates of Cretaceous pCO2

Alkenone-derived estimates of Cretaceous pCO2

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