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Carbonates and Evaporites

, Volume 8, Issue 1, pp 109–117 | Cite as

Ordered, stoichiometric and sucrosic dolomitization: A result of prolonged exposure to warm sea water: Proterozoic Chanda Limestone, Adilabad, India

  • Subir Sarkar
  • Pradip K. Bose
  • Gerald M. Friedman
Special Papers

Abstract

Bounded gradationally between offshore and basinal shales, the marine Proterozoic Chanda Limestone Fm., India, records steady transgression of the sea in a rifting basin. Its basal 2 meters of pelloidal limestone is succeeded by a 200 meters-long sequence of thin-bedded lime-mud turbidites of slope and basinal origin, intervened only by veneers of wind-blown dust. The nonferroan dolocrystals within these beds are sucrosic, stoichiometric and well ordered.

The limestones and dolostones bear marine carbon isotopic signatures. However, subsurface fluid exchange modified the oxygen isotopic ratios. The dolostones were enriched in18O. The source of the fluids responsible for18O enrichment were those involved in dolomitization. These subsurface basinal brines circulated through the fault system and permeated the sediments along bedding planes. The oxygen isotopes bear the signature of paleotemperatures.

Keywords

Dolomite Dolomitization Stylolite Basinal Shale Bhander Limestone 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 1993

Authors and Affiliations

  • Subir Sarkar
    • 1
  • Pradip K. Bose
    • 1
  • Gerald M. Friedman
    • 2
    • 3
    • 4
  1. 1.Department of Geological SciencesJadavpur UniversityCalcuttaIndia
  2. 2.Department of GeologyBrooklyn CollegeBrooklyn
  3. 3.Dept. of Earth and Environmental SciencesGraduate School of The City University of New YorkUSA
  4. 4.Northeastern Science Foundation, Inc.TroyUSA

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