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Mg/Ca paleothermometry in high salinity environments

Hoogakker, Babette A.A., Klinkhammer, Gary P., Elderfield, Harry, Rohling, Eelco J. and Hayward, Chris (2009) Mg/Ca paleothermometry in high salinity environments Earth and Planetary Science Letters, 284, (3-4), pp. 583-589. (doi:10.1016/j.epsl.2009.05.027).

Record type: Article

Abstract

Planktonic foraminiferal Mg/Ca ratios have become a fundamental temperature proxy in past climate reconstructions. However, in the highly evaporative seas of the tropics and subtropics, anomalously high planktonic foraminiferal Mg/Ca ratios arise, possibly linked to high salinities. The extent to which salinity affects Mg uptake into foraminiferal calcite remains disputed. Some studies suggest only minor salinity effects, whereas others suggest a dominant role. Here, we present new data from the highly saline (> 40) Red Sea, which separate pure foraminiferal calcite from other phases. The results show that high Mg/Ca ratios (7 to 13 mmol/mol), found by conventional analysis of planktonic foraminifera from a Red Sea sediment core, are not caused by increased Mg uptake into foraminiferal calcite in a high salinity setting (e.g. beyond those predicted by culturing studies), but instead result from secondary high Mg-calcite overgrowths. The overgrowths likely formed near the sediment–seawater interface, from CaCO3 supersaturated interstitial seawater.

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More information

Published date: 15 July 2009
Keywords: Mg/Ca paleothermometry, Red Sea, salinity, high Mg-calcite overgrowths, conventional ICP-AES, electron microprobe analysis, scanning electron microscopy, flow-through time resolved analysis, CaCO3 supersaturation, Globigerinoides ruber

Identifiers

Local EPrints ID: 67394
URI: http://eprints.soton.ac.uk/id/eprint/67394
ISSN: 0012-821X
PURE UUID: c2159e56-fcb6-4edd-976f-2e7e8cc5024f
ORCID for Eelco J. Rohling: ORCID iD orcid.org/0000-0001-5349-2158

Catalogue record

Date deposited: 17 Aug 2009
Last modified: 19 Jul 2017 00:19

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Contributors

Author: Babette A.A. Hoogakker
Author: Gary P. Klinkhammer
Author: Harry Elderfield
Author: Chris Hayward

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