Mg/Ca Ratios in Synthetic Low-Magnesium Calcite: An Experimental Investigation

The work presented sought to determine the effects of Mg/Ca ratios in solution have on Mg partitioning (K Mg ) between precipitated abiotic low-Mg calcite and solution. Experiments were set up so that Mg/Ca in precipitated abiotic calcite would match the Mg/Ca in planktonic foraminifera. This resear...

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Bibliographic Details
Published in:Minerals
Main Authors: Jeremy M. Weremeichik, Rinat I. Gabitov, Aleksey Sadekov, Aleksandra Novak, Angel Jimenez, Rooban Venkatesh K. G. Thirumalai, Jac J. Varco, Andrew Dygert
Format: Article in Journal/Newspaper
Language:English
Published: MDPI AG 2021
Subjects:
low-magnesium
calcite
Mg/Ca
partition coefficient
Mineralogy
QE351-399.2
Planktonic foraminifera
Online Access:https://doi.org/10.3390/min11111158
https://doaj.org/article/dafba7472e4d4da98507121eb52aaf02
Description
Summary:The work presented sought to determine the effects of Mg/Ca ratios in solution have on Mg partitioning (K Mg ) between precipitated abiotic low-Mg calcite and solution. Experiments were set up so that Mg/Ca in precipitated abiotic calcite would match the Mg/Ca in planktonic foraminifera. This research intended to investigate the effect of Mg/Ca (Fluid) on K Mg when the molar value of Mg/Ca (Fluid) was below 0.5, which is below the previously reported Mg/Ca range. The values of pH, salinity, and aqueous Mg/Ca were monitored during calcite precipitation, and Mg/Ca of calcite was determined at the end of experiments. Partition coefficients of Mg were evaluated as a ratio of Mg/Ca in calcite to the averaged ratio of aqueous Mg/Ca for each experiment.

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