Journal Title
Title of Journal: Int J Earth Sci Geol Rundsch
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Abbravation: International Journal of Earth Sciences
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Publisher
Springer-Verlag
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Authors: Rastislav Milovský Alfons van den Kerkhof Jochen Hoefs Vratislav Hurai Walter Prochaska
Publish Date: 2011/07/09
Volume: 101, Issue: 2, Pages: 535-554
Abstract
Basal hydraulic breccias of alpine thinskinned Muráň nappe were investigated by means of cathodoluminescence petrography stable isotope geochemistry and fluid inclusions analysis Our study reveals an unusual dynamic fluid regime along basal thrust plane during final episode of the nappe emplacement over its metamorphic substratum Basal thrusting fluids enriched in 18O silica alumina alkalies and phosphates were generated in the underlying metamorphosed basement at epizonal conditions corresponding to the temperatures of 400–450°C The fluids fluxed the tectonized nappe base leached evaporitebearing formations in hangingwall whereby becoming oversaturated with sulphates and chlorides The fluids further modified their composition by dedolomitization and isotopic exchange with the host carbonatic cataclasites Newly formed mineral assemblage of quartz phlogopite albite potassium feldspar apatite dravite tourmaline and anhydrite precipitated from these fluids on cooling down to 180–200°C Finally the cataclastic mush was cemented by calcite at ambient anchizonal conditions Recurrent fluid injections as described above probably enhanced the final motion of the Muráň nappeR M is thankful for the financial support from the DAAD German Academic Exchange Agency and the VEGA Slovak Scientific Grant Foundation grant No 2/0040/08 Reinhold Przybilla is gratefully acknowledged for technical support during mass spectrometric measurements and reviewers—particularly H Masson—for their inspiring comments
Keywords:
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