Rates of Dolomitization: The Influence of Dissolved Sulphate

  1. Bruce Purser,
  2. Maurice Tucker and
  3. Donald Zenger
  1. D. W. Morrow and
  2. H. J. Abercrombie

Published Online: 14 APR 2009

DOI: 10.1002/9781444304077.ch21

Dolomites: A Volume in Honour of Dolomieu

Dolomites: A Volume in Honour of Dolomieu

How to Cite

Morrow, D. W. and Abercrombie, H. J. (2009) Rates of Dolomitization: The Influence of Dissolved Sulphate, in Dolomites: A Volume in Honour of Dolomieu (eds B. Purser, M. Tucker and D. Zenger), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304077.ch21

Author Information

  1. Institute of Sedimentary and Petroleum Geology, 3303–33rd St NW, Calgary, Alberta T2L 2A7, Canada

Publication History

  1. Published Online: 14 APR 2009
  2. Published Print: 25 MAY 1994

ISBN Information

Print ISBN: 9780632037872

Online ISBN: 9781444304077

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Keywords:

  • dolomitization rates - influence of dissolved sulphate;
  • dolomitization and sulphate;
  • sulphate-bearing versus sulphate-free longer term pairs of runs;
  • reactant calcite in sulphate-free runs;
  • aqueous chemistry reaction modelling program, PHREEQE;
  • application of PHREEQE program - simulation of reactions;
  • simulations of reaction pathways for ealcite dolomitization in sulphate-bearing and sulphate-free solutions

Summary

Dissolved sulphate at a concentration of 0.005 M retards, but does not prevent, the dolomitization of calcite at 230°C and equilibrium vapour pressure. Reaction simulations using geochemical modelling programs indicate that calcite is somewhat greater than an order of magnitude more undersaturated in sulphate-free solutions at 230°C than in sulphate-bearing solutions. This divergence in the level of calcite saturation is not apparent at low temperatures. One explanation for the differences in the observed rates of dolomitization is that dissolution of calcite is more rapid in a sulphate-free environment at high temperatures because of its greater degree of undersaturation.