nikkii Posted September 22, 2018 Posted September 22, 2018 I have recently been reading a lot of papers of different paleothermometers. The Calcium in calcium carbonate can get replaced by Mg and Sr and people use the ratios of Mg/Ca and Sr/Ca to predict past ocean surface temperatures. What I can't seem to understand is why the Mg/Ca and Sr/Ca show opposite trends with temperature such that as temperature increases Mg/Ca increases while Sr/Ca decreases. I would have thought they would both increase. Could someone please explain this to me? Thank you
chenbeier Posted September 23, 2018 Posted September 23, 2018 Probanbly the ion diameter and soloubility. Mg<Ca<Sr Calcium is in the midle, if a substitution with Mg takes place increasing if a substitution with Sr takes place decreasing temperature.
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