In the Southern Steep Belt of the Italian Central Alps relicts of the pre-Alpine continental crust are exposed and preserve their structures and mineral associations. Between Valtellina (SO) and Val Camonica (BS) 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-Variscan (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.

Contrasting tectono-metamorphic evolutions during Pre-Alpine within the Southern Steep Belt (Central Alps) / M. Zucali, I. Spalla, M. Roda, D. Zanoni. - In: RENDICONTI ONLINE DELLA SOCIETÀ GEOLOGICA ITALIANA. - ISSN 2035-8008. - 36:suppl. 1(2015), pp. 83-83. ((Intervento presentato al convegno Riunione Annuale GIGS 2015 tenutosi a Catania nel 2015.

Contrasting tectono-metamorphic evolutions during Pre-Alpine within the Southern Steep Belt (Central Alps)

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

Abstract

In the Southern Steep Belt of the Italian Central Alps relicts of the pre-Alpine continental crust are exposed and preserve their structures and mineral associations. Between Valtellina (SO) and Val Camonica (BS) 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-Variscan (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/2434/588848
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