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Type: Journal article
Title: Calibrating the element composition of Donax deltoides shells as a palaeo-salinity proxy
Author: Izzo, C.
Manetti, D.
Doubleday, Z.
Gillanders, B.
Citation: Palaeogeography, Palaeoclimatology, Palaeoecology, 2017; 484:89-96
Publisher: Elsevier BV
Issue Date: 2017
ISSN: 0031-0182
Statement of
Christopher Izzo, Danielle Manetti, Zoë A. Doubleday, Bronwyn M. Gillanders
Abstract: Bivalve shell chemistries provide valuable insights into past environments if relationships between shell chemistry and environmental conditions are known. This study assessed the suitability of Goolwa cockle (Donax deltoides) shell element composition as an environmental proxy for southern Australia, a region lacking high-resolution environmental records. Cockles were collected along an environmental gradient and the element composition of corresponding water and shell samples were quantified using a combination of ICP-AES and ICP-MS (for water samples), and LA-ICP-MS (for shells). Of the elements analysed, Ba/Ca, Li/Ca and Mg/Ca in shells reflected ambient water chemistries. Shell Ba/Ca concentrations showed a significant, negative relationship with recorded salinities, and a positive (non-significant) trend was observed between Mg/Ca and water temperature. Further assessment of environmental and biological controls on element incorporation are required; however, Ba/Ca in D. deltoides shells appears a suitable palaeo-salinity tool and has the potential to provide an easily accessible and valuable proxy to gain insights into past environmental conditions over extensive time scales.
Keywords: Barium; Goolwa cockle; pipi; LA-ICPMS; Australia; drought
Description: Accepted 23 November 2016
Rights: © 2016 Elsevier B.V. All rights reserved.
DOI: 10.1016/j.palaeo.2016.11.038
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Appears in Collections:Aurora harvest 3
Environment Institute publications

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