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(2020) Radiogenic and Stable Sr Isotope Records Preceding the Sturtian Snowball Earth Event

Sarvian N, Jacobson A, Hurtgen M, Osburn M & Maloof A

https://doi.org/10.46427/gold2020.2285

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14d: Plenary Hall, Tuesday 23rd June 00:45 - 00:48

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Submitted by Yuexiao Shao on Tuesday 23rd June 00:05
Very nicely structured talk, loved the way you introduce the Sr isotopes. Were the d88/86Sr of seawater calculated from d88/86Sr(carb) by D88/86Sr(carb-sw)= -0.24 per mil? How did you get this offset? Is your carbonate from bulk sediment?
Thank you for your comments and your question! The d88/86Sr that is shown in my Sr isotope systematics figure is the value of modern seawater, while the values that I measured are of d88/86Sr of the carbonates. For my preliminary model reconstructing the d88/86Sr of seawater, I was going to be using a static fractionation factor of D88/86Sr(carb-sw). That is from Bohm et al 2012, a study done to investigate the D88/86Sr of forams. So there is a caveat there too, that my samples from the Neoproterozoic and therefore not biogenically precipitated. Regarding my samples, they are from bulk carbonate rock. I will be doing a microdrilling analysis to investigate if there is any intra sample variation in d88/86Sr space between different microfacies. Please feel free to reach out with any follow ups, my email is nilou@earth.northwestern.edu, or message me on Discord! Would love to continue chatting.

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