(2020) Calcium Isotope Variations of Phanerozoic Seawater
Böhm F & Eisenhauer A
14d: Plenary Hall, Tuesday 23rd June 06:15 - 06:18
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Would the changes in calcium isotopes at all be related to changes in weathering? (This may also be related to the correlation with temperature changes, perhaps)?
Changes in the Ca isotope composition of the weathering flux would also change the d44Ca of the bulk record. This seems not to be the case. Changes in the magnitude of the weathering flux can only lead to transient isotope excursions (and probably only very small shifts, see papers by Komar & Zeebe). The isotope trends on the very long time-scales we are looking at here can not be caused by ocean Ca inventory changes. Thus, the most likely explanation, I think, is a change in fractionation between seawater Ca and precipitated Ca carbonates.
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