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Mg/Ca and Sr/Ca Paleothermometry

nikkii
in Earth Science

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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

12 minutes ago, John Cuthber said:

In both cases the ratio (lighter ion/ heavier ion) increases.

Unlike some I am not above learning from others, in fact I am pleased you have told me something I didn't know or spot, though I tried to look it up.

Thank you. +1

Edited by studiot

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