Contrasting tectono-metamorphic evolutions during Pre-Alpine within the Southern Steep Belt (Central Alps)
Abstract
Data di Pubblicazione:
2015
Citazione:
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.
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.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
M. Zucali, I. Spalla, M. Roda, D. Zanoni
Link alla scheda completa: