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The solubility and stabilization of ikaite (CaCO3.6H2O) from 0?? to 25??C: environmental and paleoclimatic implications for thinolite tufa

Journal of Geology

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Abstract

We determined the solubility of ikaite from 0?? to 25??C to model its saturation state in natural waters and test the hypothesis that it is the precursor of the calcite pseudomorphs in thinolite tufa of Quaternary Lake Lahonta. Its precipitation in near-freezing marine sediments requires large additions of HCO3 to pore fluids from the diagenetic decomposition of organic matter. Its crystallization in tufas of alkaline lakes, however, requires only small additions of Ca from springs. Ikaite is stabilized in natural environments by orthophosphate. The presence of ikaite or its pseudomorphs is an indicator of near-freezing comditions in environments with high concentrations of orthophosphate. If ikaite is the precursor of thinolite tufa, then the thinolite likely grew below the sediment-water interface at the site of sublacustrine springs during prolonged cold periods. -from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The solubility and stabilization of ikaite (CaCO3.6H2O) from 0?? to 25??C: environmental and paleoclimatic implications for thinolite tufa
Series title:
Journal of Geology
Volume
101
Issue:
1
Year Published:
1993
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Geology
First page:
21
Last page:
33