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Temperature dependence of the strontium distribution coefficient in calcite; an experimental study from 408 degrees to 2008 degrees C and application to natural diagenetic calcites

Mitchell J. Malone and Paul A. Baker
Temperature dependence of the strontium distribution coefficient in calcite; an experimental study from 408 degrees to 2008 degrees C and application to natural diagenetic calcites
Journal of Sedimentary Research (January 1999) 69 (1): 216-223

Abstract

The temperature dependence of Sr coprecipitation with calcite was determined experimentally in solutions with Sr/Ca ratios and ionic strengths closely resembling marine pore fluids. Aragonite-to-calcite and dolomite-to-calcite transformations were conducted over a temperature range from 40 degrees to 200 degrees C. Temperature dependence of the distribution coefficient of strontium in calcite (D (super C) (sub Sr) ) is significant. D (super C) (sub Sr) in aragonite-to-calcite experiments varied from 0.046 at 40 degrees to 0.068 at 200 degrees C. D (super C) (sub Sr) in dolomite-to-calcite experiments varied from 0.034 at 40 degrees C to 0.062 at 200 degrees C. Experimental values of D (super C) (sub Sr) are somewhat dependent on the precursor phase. The experimental results are applied to natural diagenetic and hydrothermal calcites recovered from the sediment-covered Middle Valley part of the Juan de Fuca Ridge spreading center (Ocean Drilling Program Holes 857C and 858D). Low-Mg calcites from Hole 858D have Sr contents appropriate for their present-day in situ temperatures and pore-water Sr values. In contrast, high-Mg calcites from Hole 858D that precipitated from supersaturated pore waters at inferred high growth rates have elevated Sr contents relative to calculated equilibrium values. The Sr contents of calcites from Hole 857C are close to predicted equilibrium values in some instances but are substantially different in others. Deviations from predicted equilibrium Sr contents, especially in nodules, are attributed to the formation of mixed generations of carbonate precipitating with increasing burial depths and temperatures through pore waters with variable Sr composition.


ISSN: 1527-1404
EISSN: 1938-3681
Serial Title: Journal of Sedimentary Research
Serial Volume: 69
Serial Issue: 1
Title: Temperature dependence of the strontium distribution coefficient in calcite; an experimental study from 408 degrees to 2008 degrees C and application to natural diagenetic calcites
Affiliation: Texas A&M University, Ocean Drilling Program, College Station, TX, United States
Pages: 216-223
Published: 199901
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 16
Accession Number: 1999-049186
Categories: Geochemistry of rocks, soils, and sedimentsSedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: Duke University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 199917
Program Name: ODPOcean Drilling Program
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