Abstract

The Triassic of the Western Carpathians consists of "hypersaline" sequence in the north, grading southwards into dolomite and then limestone. This zonal arrangement was due to the development of algal reefs (banks) in the south, with subsequent "hypersaline" lagoonal evolution in the back-reef (bank) area. It is proposed that the dolomites within the lagoonal sequence originated by a very early diagenetic replacement of an aragonite mud, with clay minerals serving as charged net membranes or seeds for penetrating interstitial brines with high Mg/Ca ratios. It is also proposed that these brines were squeezed out from the lagoonal sequence into the porous algal reefs (banks) during later stages of diagenesis, causing dolomitization of the lagoonal side of the reefs (banks).

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