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Isotope studies of dolomite formation under sedimentary conditions

Geochimica et Cosmochimica Acta

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Abstract

Measurements of stable isotope abundances of the carbonate portion of the sediment in Deep Springs Lake, California, indicate the presence of at least three phases: a magnesian calcite, a primary sedimentary dolomite, and a detrital dolomite. The former two have isotopic compositions consistent with precipitation at isotopic equilibrium from waters of the lake area. The measured isotopic fractionation factor between sedimentary dolomite and its interstitial water is 1.0351, which is outside the range possible for calcite-water. This indicates that the dolomite has formed by direct crystallization from solution and not from a caloite precursor without further isotope exchange. Isotopic and X-ray evidence does not support the contention of Peterson et al. (1966) that Deep Springs Lake dolomite crystals grow by means of a calcite-like surface layer. ?? 1968.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Isotope studies of dolomite formation under sedimentary conditions
Series title:
Geochimica et Cosmochimica Acta
Volume
32
Issue:
4
Year Published:
1968
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article