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| Titel |
Improving interpretation of stalagmite δ¹⁸O and growth-rate with cave-analogue calcite growth experiments |
| VerfasserIn |
Chris Day, Gideon Henderson |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250041788
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| Zusammenfassung |
| An increasing number of studies report stable-isotope and trace-element records
in speleothems. This variation is controlled by diverse environmental variables
including the climatically important variables, temperature and rainfall. There is,
however, a paucity of laboratory studies attempting to understand the influence of these
environmental controls on stalagmite geochemistry. Quantitative data from such
studies would dramatically improve our ability to reconstruct palaeoclimate from
stalagmites.
We have completed a new series of carbonate growth experiments in karst-analogue
conditions in the laboratory. The setup closely mimics natural processes (e.g. precipitation
driven by CO2 degassing, low ionic strenth solution, thin solution film) but with a tight
control on growth conditions (temperature, pCO2, drip rate, calcite saturation index and the
composition of the initial solution).
Calcite is dissolved in deionized water in a 20,000 ppmV pCO2 environment and an
aliquot of trace metals solution added. This solution is then dripped onto glass plates (coated
with seed-calcite) in a lower pCO2 environment ( |
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