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(2020) Calcium Isotope Variations of Phanerozoic Seawater

Böhm F & Eisenhauer A

https://doi.org/10.46427/gold2020.213

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14d: Plenary Hall, Tuesday 23rd June 06:15 - 06:18

Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.

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.

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