Trace (and minor...) elements in speleothems as part of a multi-proxy approach to deciphering past environmental change.
Logistics
Date: 28 April
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Description
Dr. Chris Day (Department of Earth Sciences, University of Oxford)
The central theme of this seminar was to explore how trace (and minor) elements, in calcite and aragonite, can help with deciphering past environmental change.
Because there are multiple controls on all measured elements and isotopes in speleothems (e.g., Mg/Ca, Sr/Ca, Ba/Ca, d13C, d18O, d44/42Ca), strategies and tools for critically assessing speleothem data sets, in view of maximising the certainty with which we can reconstruct environmental parameters, were explored.
Post meeting material
Timeline
4min53: Trace-elements recording changes in PCP
8min41: Environmental reconstruction example 1: hydrological change
13min24: Environmental reconstruction example 2: dust control on Mg/Ca
16min19: Calcium isotopes as a tool for absolute PCP reconstruction
24min09: Software modelling tools (CaveCalc, iSolution, I-Stal, IsoCave)
31min34: Thoughts on the impact of growth rate on D(Sr)
41min38: Thoughts on the impact of temperature on D(Sr)
45min29: Aragonite partition coefficients from cave-analogue experiments
Q&A
The Q&A can be accessed below and provides:
i) follow-up information to questions asked after the Sisal seminar;
ii) aragonite partition coefficients from Oxford Cave experiments (Day et al., 2021);
iii) a visual comparison of partition coefficients from Jamieson et al. (2016), Wassenburg et al. (2016) and Day et al. (2021).
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> Access Q&A session
Further information
Contact the SISAL Steering Committee: http://pastglobalchanges.org/science/wg/sisal/people
Find out more about SISAL: http://pastglobalchanges.org/sisal