Köhler, Stephan
- Graz University of Technology
Abstract
Stable oxygen isotopic fractionation during inorganic calcite precipitation was experimentally studied by spontaneous precipitation at various pH (8.3 1000lnαcalcite–water=-1.094logR+30.871000lnαcalcite–water=-0.534logR+26.80" role="presentation" style="display: inline-block; line-height: normal; font-size: 14.4px; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border-width: 0px; border-style: initial; position: relative;">1000lnαcalcite–water=-0.534logR+26.80at 5, 25, and 40 °C, respectively.The impact of precipitation rate on 1000lnαcalcite–water value in our experiments clearly indicates a kinetic effect on oxygen isotopic fractionation during calcite precipitation from aqueous solution, even if calcite precipitated slowly from aqueous solution at the given temperature range. Our results support Coplen's work [Coplen T. B. (2007) Calibration of the calcite–water oxygen isotope geothermometer at Devils Hole, Nevada, a natural laboratory. Geochim. Cosmochim. Acta 71, 3948–3957], which indicates that the equilibrium oxygen isotopic fractionation factor might be greater than the commonly accepted value.
Keywords
Calcite; Oxygen isotopes; Isotopic fractionation factor; Precipitation rate
Published in
Chemical Geology
2009, volume: 268, number: 1-2, pages: 107-115
Publisher: ELSEVIER SCIENCE BV
SLU Authors
UKÄ Subject classification
Geosciences, Multidisciplinary
Publication identifier
- DOI: https://doi.org/10.1016/j.chemgeo.2009.07.015
Permanent link to this page (URI)
https://res.slu.se/id/publ/89830