The relationship between the hydrogen and oxygen isotopes of freshwater bivalve shells and their home streams

M. Carroll; C. Romanek; L. Paddock

doi:10.1016/j.chemgeo.2006.04.012

The relationship between the hydrogen and oxygen isotopes of freshwater bivalve shells and their home streams

M. Carroll, C. Romanek, L. Paddock

Research output: Contribution to journal › Article › peer-review

Abstract

Recent technical advances have facilitated the analysis of microgram-size samples of mollusk shell for the hydrogen isotope composition of the organic matrix. Our results suggest that these data are meaningful as the δD_shell values of samples of freshwater bivalve shells from different streams preserve the relative distribution of δD values from the water they inhabited over their lifetime (δD_shell - δD_water = - 145‰) after correcting for the contribution of exchangeable hydrogen (∼ 36%) in organic matrix. When δD_shell values are compared to the δ¹⁸O values of the mineral fraction of the shell (CaCO₃ as aragonite), they plot along a line that reflects the isotopic composition of the waters in which the bivalves lived. This relationship is potentially useful for paleoenvironmental reconstructions because the δD value of the organic matrix may serve as an independent proxy for the δ¹⁸O value of water in paleotemperature equations.

Original language	English (US)
Pages (from-to)	211-222
Number of pages	12
Journal	Chemical Geology
Volume	234
Issue number	3-4
DOIs	https://doi.org/10.1016/j.chemgeo.2006.04.012
State	Published - Nov 15 2006
Externally published	Yes

Keywords

Continental environmental proxies
Deuterium
Paleotemperature
Stable isotopes
Unionid

ASJC Scopus subject areas

Geology
Geochemistry and Petrology

Online availability

10.1016/j.chemgeo.2006.04.012

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title = "The relationship between the hydrogen and oxygen isotopes of freshwater bivalve shells and their home streams",

abstract = "Recent technical advances have facilitated the analysis of microgram-size samples of mollusk shell for the hydrogen isotope composition of the organic matrix. Our results suggest that these data are meaningful as the δDshell values of samples of freshwater bivalve shells from different streams preserve the relative distribution of δD values from the water they inhabited over their lifetime (δDshell - δDwater = - 145‰) after correcting for the contribution of exchangeable hydrogen (∼ 36%) in organic matrix. When δDshell values are compared to the δ18O values of the mineral fraction of the shell (CaCO3 as aragonite), they plot along a line that reflects the isotopic composition of the waters in which the bivalves lived. This relationship is potentially useful for paleoenvironmental reconstructions because the δD value of the organic matrix may serve as an independent proxy for the δ18O value of water in paleotemperature equations.",

keywords = "Continental environmental proxies, Deuterium, Paleotemperature, Stable isotopes, Unionid",

author = "M. Carroll and C. Romanek and L. Paddock",

note = "Funding Information: This research was supported by the Environmental Remediation Sciences Division of the Office of Biological and Envrionmental Research, U.S. Department of Energy, through Financial Assistance Award No. DE-FC09-96-SR18546 to the University of Georgia Research Foundation. We thank D. Dettman, S. Holland, M. Kowalewski, P. Schroeder and an anonymous reviewer for their thoughtful reviews. [P.D.] ",

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AU - Paddock, L.

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PY - 2006/11/15

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The relationship between the hydrogen and oxygen isotopes of freshwater bivalve shells and their home streams

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