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Calcite precipitation rates in the field: Measurement and prediction for a travertine-depositing stream

Journal Article · · Geochimica et Cosmochimica Acta; (USA)
;  [1]
  1. Univ. of Virginia, Charlottesville (USA)
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Rates of calcite precipitation from a travertine-depositing stream were determined from changes in stream composition between consecutive sampling points and were compared with rates predicted from a laboratory-derived rate law. The agreement in rates was generally within an order of magnitude and routinely within a factor of 3. Least agreement between measured and predicted rates was obtained for sections of flowpath where relatively little change in bulk chemical composition occurred, which were the sections with the greatest mass transfer calculation error, and for the stream segment including a waterfall, which was the section with the greatest error in estimated surface area. Reaction rate obtained from the mass of calcite precipitated onto seed crystals placed in the stream significantly underestimated the mass transfer rate. For the travertine-depositing stream of Warm River Cave and Falling Spring Creek, Virginia, the coupling of equilibrium speciation models with mass balance calculations and simple field measurements allowed successful field-based quantification of reaction rates.

OSTI ID:
5221533
Journal Information:
Geochimica et Cosmochimica Acta; (USA), Journal Name: Geochimica et Cosmochimica Acta; (USA) Vol. 52:10; ISSN GCACA; ISSN 0016-7037
Country of Publication:
United States
Language:
English

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Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
ALKALINE EARTH METAL COMPOUNDS
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
CHEMICAL COMPOSITION
CHEMISTRY
FEDERAL REGION III
FRESH WATER
GEOCHEMISTRY
HYDROGEN COMPOUNDS
KINETICS
LIMESTONE
MASS BALANCE
MASS TRANSFER
MINERALS
NORTH AMERICA
OXYGEN COMPOUNDS
PRECIPITATION
REACTION KINETICS
ROCKS
SEDIMENTARY ROCKS
SEPARATION PROCESSES
STREAMS
SURFACE WATERS
THERMODYNAMIC ACTIVITY
TRAVERTINE
USA
VIRGINIA
WATER