Isotopic fractionation accompanying CO2 hydroxylation and carbonate precipitation from high pH waters at The Cedars, California, USA

Isotopic fractionation accompanying CO2 hydroxylation and carbonate precipitation from high pH waters at The Cedars, California, USA

The Cedars ultramafic block hosts alkaline springs (pH > 11) in which calcium carbonate forms upon uptake of atmospheric CO2 and at times via mixing with surface water. These processes lead to distinct carbonate morphologies with “floes” forming at the atmosphere-water interface, “snow” of fine p...

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Veröffentlicht in:Geochimica et cosmochimica acta 2021-05, Vol.301 (C), p.91-115
Hauptverfasser: Christensen, John N., Watkins, James M., Devriendt, Laurent S., DePaolo, Donald J., Conrad, Mark E., Voltolini, Marco, Yang, Wenbo, Dong, Wenming
Format: Artikel
Sprache:eng
Schlagworte:
Alkaline springs
Aragonite
Calcite
Calcium isotopes
Carbon isotopes
CO2 hydroxylation
Kinetic isotope effects
Oxygen isotopes
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Zusammenfassung:The Cedars ultramafic block hosts alkaline springs (pH > 11) in which calcium carbonate forms upon uptake of atmospheric CO2 and at times via mixing with surface water. These processes lead to distinct carbonate morphologies with “floes” forming at the atmosphere-water interface, “snow” of fine particles accumulating at the bottom of pools and terraced constructions of travertine. Floe material is mainly composed of aragonite needles despite CaCO3 precipitation occurring in waters with low Mg/Ca (
ISSN:0016-7037
1872-9533
DOI:10.1016/j.gca.2021.01.003