The Bresimo Valley (Western Trentino, NE Italy) is a very peculiar area of the Alps (Nonsberg-Ultental) where very high pressure (about 3.0 GPa) gneisses, migmatites, eclogites and garnet peridotites of the Upper Austroalpine domain crop out. These rocks, which belong to the Adriatic crust, are derived from a very deep Palaezoic subduction complex, dragged to 100 km depth into the peridotitic mantle. They have been progressively exhumed and finally exposed at the surface during the late Alpine orogeny. The latest evolution is characterized by brittle faults and joints that deeply influenced the regional morphology. The geological map was the starting point for an integrated approach based on structural survey, petrographic, petrological, radiometric analyses, and on seismo- and morpho-tectonic studies.
Recent surface tectonics in a Paleozoic deeply-exhumed basement: The Bresimo valley (western Trentino)
MARTIN, SILVANA;FELLIN, GIUDITTA;MASSIRONI, MATTEO;SURIAN, NICOLA;
2004
Abstract
The Bresimo Valley (Western Trentino, NE Italy) is a very peculiar area of the Alps (Nonsberg-Ultental) where very high pressure (about 3.0 GPa) gneisses, migmatites, eclogites and garnet peridotites of the Upper Austroalpine domain crop out. These rocks, which belong to the Adriatic crust, are derived from a very deep Palaezoic subduction complex, dragged to 100 km depth into the peridotitic mantle. They have been progressively exhumed and finally exposed at the surface during the late Alpine orogeny. The latest evolution is characterized by brittle faults and joints that deeply influenced the regional morphology. The geological map was the starting point for an integrated approach based on structural survey, petrographic, petrological, radiometric analyses, and on seismo- and morpho-tectonic studies.
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