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), 583-589. (doi:10.1016/j.epsl.2009.05.027).
Download
Full text not available from this repository.
Description/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.
| Item Type: | Article |
|---|---|
| ISSNs: | 0012-821X (print) |
| Related URLs: | |
| 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 |
| Subjects: | Q Science > QE Geology Q Science > QD Chemistry G Geography. Anthropology. Recreation > GC Oceanography |
| Divisions: | University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES) |
| Item ID: | 67394 |
| Date Deposited: | 17 Aug 2009 |
| Last Modified: | 01 Jun 2011 15:04 |
| Contributors: | Hoogakker, Babette A.A. (Author) Klinkhammer, Gary P. (Author) Elderfield, Harry (Author) Rohling, Eelco J. (Author) Hayward, Chris (Author) |
| Date: | 15 July 2009 |
| Status: | Published |
| URI: | http://eprints.soton.ac.uk/id/eprint/67394 |
Actions (login required)
 |
View Item |
