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Dolomitization patterns in Jurassic-Cretaceous dissolution-collapse breccias of Mainalon Mountain (Tripolis Unit, Central Peloponnesus-Greece)

  • Fonti Pomoni Papaioanou
  • Zafiris Carotsieris
General Papers

Abstract

Along the Jurassic-Cretaceous dolomitic beds of the Tripolis Unit in the Mainalon Mt. and the surrounding areas, products of a widespread breccias have been recognized. This brecciation extended through at least two stages, early- and late diagenetic, respectively. The first brecciation stage is considered to have taken place penecontemporaneously or soon after the deposition related with desiccation processes and/or small-scale dissolution of evaporites. The second brecciation stage is considered to have taken place after lithification, and resulted from evaporite solution-collapse processes. Evidence for vanished evaporites consists of pseudomorphs after evaporite crystals-of replacement- and void- filling orgin-nodules and rosettes, as well as doubly terminated megaquartz crystals.

Dolomitization patterns include six dolomitic types, corresponding to different stages during the diagenetic evolution of the formation. Type-1 dolomite constitutes the matrix dolomite and results by replacement of precursor calcium-carbonate facies or a combination of replacement and direct precipitation. Type-2 dolomite has been introduced mechanically after the first brecciation. Type-3 dolomite is considered to represent a diagenetic replacement dolomite resulting after slight burial. Type-4 dolomite constitutes the first cement generation of the breccias and frequently shows the characteristic crystallographic-optical features of preexisting void-filling evaporties. The last dolomitizing events are represented by the Type-5 dolomite replacing a late-stage sparry calcite and Type-6 dolomite replacing microcrystalline quartz pseudomorphs after evaporites. Preserved traces of textural characteristic include cryptalgal laminites, mudstones with pseudomorphs after evaporites, and foraminiferal wackestones, suggesting deposition in peritidal environment.

Keywords

Dolomite Breccia Evaporite Dolomitization Sedimentary Petrology 
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

  • Fonti Pomoni Papaioanou
    • 1
  • Zafiris Carotsieris
    • 2
  1. 1.Institute of Geology and Mineral ExplorationAthensGreece
  2. 2.National University of AthensAthensGreece

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