It is noted that Mg usually is more concentrated than Ca in a series of saline waters. For instance, sea floor drilled sample shows pore water contains twice as much of Mg as Ca. Is it because Mg-ligand complexes are more stable than those of Ca-ligand complexes or other reasons?
Hello! Perhaps the following research articles might be of assistance to you:
Post Mesozoic Rapid Increase of Seawater Mg/Ca due to Enhanced Mantle-Seawater Interaction (LIGI et al., 2013)
http://www.nature.com/srep/2013/130925/srep02752/pdf/srep02752.pdf
Review: Geological and Experimental Evidence for Secular Variation in Seawater Mg/Ca (Calcite-Aragonite Seas) and its Effects on Marine Biological Calcification (J. B. RIES, 2009)
http://www.biogeosciences.net/7/2795/2010/bg-7-2795-2010.pdf
The Influence of Temperature and Seawater Composition on Calcite Crystal Growth Mechanisms and Kinetics: Implications for Mg Incorporation in Calcite Lattice (LOPEZ et al., 2009)
http://www.ipgp.fr/~piag/CO2-bis/lopez%20et%20al.,%202009.pdf
You may also directly request the following work by Elizabeth A. BURTON, which is currently available on ResearchGate:
The Effect of PCO2 and Temperature on Magnesium Incorporation in Calcite in Seawater and MgCl2 – CaCl2 Solutions (BURTON and WALTER, 1991)
https://www.researchgate.net/publication/222195548_The_effects_of_PCO2_and_temperature_on_magnesium_incorporation_in_calcite_in_seawater_and_MgCl2-CaCl2_solutions
Article The effects of PCO2 and temperature on magnesium incorporati...
Sulfate. It's presence in seawater inhibits Mg deposition. Mg starts depositing in hypersaline coastal mats where there is sufate-reducing biological activity.
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