SIDERITE-ANKERITE-MUSCOVITE METASEDIMENTS IN THE NIZKE-TATRY MTS - THEIR GEOLOGICAL POSITION, PHASE-EQUILIBRIA AND POTOLITH

Siderite-ankerite-bearing metasandstones and phyllites (SAMP), identif ied recently in the broader area of Jasenie (Nizke Tatry Mts., Tatric Unit), are described in detail. On the basis of petrological mineralog ical chemical composition and phase equilibria observations the author s argue that the formation of the SAMP has followed a sedimentary --> low degree metamorphic +/- mylonitization and not high degree metamorp hic --> diaphthoritic +/- mylonitization pathway, advocated by other p etrologists. They also attempt to establish the criteria for distingui shing in this area the low temperature metasediments from the diaphtho rized and blastomylonitized augen gneisses and amphibolites.