Abstract Details
(2020) Calcium Isotope Variations of Phanerozoic Seawater
Böhm F & Eisenhauer A
https://doi.org/10.46427/gold2020.213
14d: Plenary Hall, Tuesday 23rd June 06:15 - 06:18
Florian Böhm
View abstracts at 11 conferences in series
Anton Eisenhauer View all 4 abstracts at Goldschmidt2020
Anton Eisenhauer View all 4 abstracts at Goldschmidt2020
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Submitted by Anastasia Yanchilina on Monday 22nd June 13:51
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.
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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