In the Southern Steep Belt, Italian Central Alps, relicts of the pre-Alpine continental crust are preserved. Between Valtellina and Val Camonica a polymetamorphic rock association occurs, belonging to the Upper Austroalpine units, which includes lithotypes from the Languard - Campo nappe (LCN) and the Tonale Series (TS). Rocks belonging to LCN and TS are low to medium grade muscovite-, biotite- and minor staurolite-bearing gneisses and micaschists with interlayered garnet- and biotite- bearing amphibolites, marbles, quartzites and pegmatites, sillimanite-bearing gneisses and micaschists. Post-ariscan (Permian) intrusives (granitoids, diorites and minor gabbros) occur. The tectono-metamorphic evolutions reconstructed for these rock associations, permit the distinction of two contrasting tectono-metamorphic units (UTM), pre-dating Permian intrusives. In this contribution we will discuss the geodynamic significance of these UTMs in the framework of the Variscan-Permian collision to extensional setting.

Pre-Alpine contrasting tectono-metamorphic evolution within the Southern Steep Belt (Central Alps) / M. Zucali, M. Roda, I. Spalla, D. Zanoni. - In: GÉOLOGIE DE LA FRANCE. - ISSN 0246-0874. - (2015), pp. 145-145. ((Intervento presentato al convegno The Variscan belt: correlations and plate dynamics tenutosi a Rennes nel 2015.

Pre-Alpine contrasting tectono-metamorphic evolution within the Southern Steep Belt (Central Alps)

M. Zucali;M. Roda;I. Spalla;D. Zanoni
2015

Abstract

In the Southern Steep Belt, Italian Central Alps, relicts of the pre-Alpine continental crust are preserved. Between Valtellina and Val Camonica a polymetamorphic rock association occurs, belonging to the Upper Austroalpine units, which includes lithotypes from the Languard - Campo nappe (LCN) and the Tonale Series (TS). Rocks belonging to LCN and TS are low to medium grade muscovite-, biotite- and minor staurolite-bearing gneisses and micaschists with interlayered garnet- and biotite- bearing amphibolites, marbles, quartzites and pegmatites, sillimanite-bearing gneisses and micaschists. Post-ariscan (Permian) intrusives (granitoids, diorites and minor gabbros) occur. The tectono-metamorphic evolutions reconstructed for these rock associations, permit the distinction of two contrasting tectono-metamorphic units (UTM), pre-dating Permian intrusives. In this contribution we will discuss the geodynamic significance of these UTMs in the framework of the Variscan-Permian collision to extensional setting.
Settore GEO/03 - Geologia Strutturale
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/588851
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