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The Li isotope composition of marine biogenic carbonates: Patterns and mechanisms

Dellinger, M.; West, J.; Paris, G.; Adkins, J.F.; Pogge von Strandmann, P.; Ullmann, C.V.; Eagle, R.A.; Freitas, P.; Bagard, M.; Ries, J.B.; Corsetti, F.A.; Perez-Huerta, A.; Kampf, A.R.

The Li isotope composition of marine biogenic carbonates: Patterns and mechanisms Thumbnail


Authors

M. Dellinger

J. West

G. Paris

J.F. Adkins

P. Pogge von Strandmann

C.V. Ullmann

R.A. Eagle

P. Freitas

M. Bagard

J.B. Ries

F.A. Corsetti

A. Perez-Huerta

A.R. Kampf



Abstract

Little is known about the fractionation of Li isotopes during formation of biogenic carbonates, which form the most promising geological archives of past seawater composition. Here we investigated the Li isotope composition (δ7Li) and Li/Ca ratios of organisms that are abundant in the Phanerozoic record: mollusks (mostly bivalves), echinoderms, and brachiopods. The measured samples include (i) modern calcite and aragonite shells from various species and natural environments (13 mollusk samples, 5 brachiopods and 3 echinoderms), and (ii) shells from mollusks grown under controlled conditions at various temperatures. When possible, the mollusk shell ultrastructure was micro-sampled in order to assess intra-shell heterogeneity. In this paper, we systematically characterize the influence of mineralogy, temperature, and biological processes on the δ7Li and Li/Ca of these shells and compare with published data for other taxa (foraminifera and corals).

Citation

Dellinger, M., West, J., Paris, G., Adkins, J., Pogge von Strandmann, P., Ullmann, C., …Kampf, A. (2018). The Li isotope composition of marine biogenic carbonates: Patterns and mechanisms. Geochimica et Cosmochimica Acta, 236, 315-335. https://doi.org/10.1016/j.gca.2018.03.014

Journal Article Type Article
Acceptance Date Mar 10, 2018
Online Publication Date Mar 17, 2018
Publication Date Sep 1, 2018
Deposit Date Aug 9, 2018
Publicly Available Date Mar 29, 2024
Journal Geochimica et Cosmochimica Acta
Print ISSN 0016-7037
Publisher Meteoritical Society
Peer Reviewed Peer Reviewed
Volume 236
Pages 315-335
DOI https://doi.org/10.1016/j.gca.2018.03.014

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