I/Ca ratios in benthic foraminifera from the Peruvian oxygen minimum zone: analytical methodology and evaluation as proxy for redox conditions.

Glock, Nicolaas, Liebetrau, Volker and Eisenhauer, Anton (2014) I/Ca ratios in benthic foraminifera from the Peruvian oxygen minimum zone: analytical methodology and evaluation as proxy for redox conditions. Open Access Biogeosciences (BG), 11 . pp. 7077-7095. DOI 10.5194/bg-11-7077-2014.

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Abstract

In this study we explore the correlation of I/Ca ratios in three calcitic and one aragonitic foraminiferal species. I/Ca ratios are evaluated as possible proxies for changes in ambient redox conditions across the Peruvian oxygen minimum zone to the ambient oxygen concentrations in the habitat of the foraminiferal species studied. We test cleaning and measurement methods to determine I/Ca ratios in benthic foraminifera from the Peruvian oxygen minimum zone. All species show a positive trend in their I/Ca ratios as a function of higher oxygen concentrations and these trends are all statistically significant except for the aragonitic species Hoeglundina elegans. The most promising species appears to be Uvigerina striata which shows a highly statistically significant correlation between I/Ca ratios and bottom water (BW) oxygenation (I/Ca = 0.032(± 0.004)[O2]BW + 0.29(± 0.03), R2 = 0.61, F = 75, P < 0.0001). Although I/Ca ratios in benthic foraminifera might prove to be a valuable proxy for changing redox-conditions the iodine volatility in acidic solutions, the species dependency ofI/Ca–[O2]BW correlations, and the individual variability of single tests severely interfere with the observed I/Ca–[O2]BW relationship.

Document Type: Article
Additional Information: WOS:000346357100038
Keywords: foraminifera, paleo proxy research, oxygen minimum zone, Peru, I/Ca ratios
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > SFB 754
OceanRep > SFB 754 > B7
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.5194/bg-11-7077-2014
ISSN: 1726-4170
Projects: Future Ocean
Date Deposited: 30 Jul 2014 07:55
Last Modified: 26 Jan 2015 07:22
URI: http://oceanrep.geomar.de/id/eprint/25345

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