Stratigrafia ed analisi di facies dei depositi permiani del Lago Mulargia ( Sardegna sud-orientale):primi risultati

BARCA S.;COSTAMAGNA, LUCA GIACOMO

2005-01-01

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Abstract

In this paper preliminary results of investigations on the stratigraphic succession of the Permian Mulargia Lake basin are here described. This succession, from 350 to 400 m thick, has been first time subdivided into 4 stratigraphic units, and respectively, from the bottom: a “Lower siliciclastic Unit”, a “Volcano-sedimentary Unit”, an “Upper siliciclastic Unit”, and a “Volcanic Unit”. The depositional frame of this succession is inferred as a network of alluvial facies of various energy degrees, comprised between the palustrine, the fluvial and the lacustrine environments. These facies are located into a continental molassic basin, progressively spreading out during the post-collisional extensional Variscan tectonic phase, and characterized, during its evolution, by two different volcanic activity cycles.