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Pre-Alpine Structural and Metamorphic Histories in the Orobic Southern Alps, Italy

  • Chapter
Pre-Mesozoic Geology in the Alps

Abstract

Petrological and structural data on the Orobic South-Alpine basement are reviewed in order to reconstruct its thermomechanical history. P-T-t paths are discussed for Val Vedello — Passo S. Marco and Lario areas, i.e. for sectors traditionally attributed to different metamorphic grades (greenschist and amphibolite facies respectively). Structural investigations evidenced that, in these zones, the first recognizable phase of deformation (D1) developed in all the Oro-bic basement under amphibolite facies conditions during the Variscan period (ca. 330 Ma). Although some metagranitoids, emplaced in the Orobic basement, are considered to be Ordovician, no relics testify to the real pre-Variscan basement during the intrusion of the granites. After the D1 phase in the central-eastern areas (Val Vedello — Passo S. Marco) during D2 phase, a greenschist retrogression is observed. In the westernmost area (Lario basement) the D2 phase is characterized by an increase in temperature under low pressure regime. During the D2 phase of deformation, considering the available geochronological data, a late Variscan post-thickening uplift is suggested for the Val Vedello-Passo S. Marco areas, and a Permo-Mesozoic uplift related to an extensional tectonic regime for the Lario area. These contrasted evolutions result from the tectonic piling up of various crustal segments of the South-Alpine basement, each representative of different tectonic histories. The polyphased character of the two tectono-metamorphic histories appears to be in contradiction with the metamorphic zoneography traditionally accepted for the South-Alpine domain.

Sketch map of the metamorphic zonation proposed for the Variscan South-Alpine chain (from the Metamorphic Map of the Alps, Niggli 1973 and Castellarin 1981 redrawn for the Orobic Alps). 1 Medium-grade metamorphic rocks; 2 low-grade metamor-phic rocks; 3 Ordovician orthogneisses; 4 late-Variscan plutons; 5 Permian volcanites; 6 Adamello pluton; 7 Permo-Cenozoic sedimentary cover; 8 Po plain. 9 thrusts; 10 anticlines; CA Cedegolo Anticline; Fa Filladi di Ambria; FC Fioraro complex; Gm Gneiss di Morbegno; MVB Massiccio delle Tre Valli Bresciane; OA Orobic Anticline; Se Scisti di Edolo; TCA Trabuchello-Cabianca anticline; VB Val Biandino pluton; VGL Val Grande line; a Val Vedello area; b Passo S. Marco area; c Lario area

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Authors
  1. G. B. Siletto
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  2. M. I. Spalla
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  3. A. Tunesi
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  4. J. M. Lardeaux
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  5. A. Colombo
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Editor information

Editors and Affiliations

  1. Institut für Mineralogie und Petrographie, Universität Pérolles, CH-1700, Fribourg, Switzerland

    J. F. von Raumer

  2. Institut für Geologie und Paläontologie, Karl-Franzens-Universität, Heinrichstraße 26, A-8010, Graz, Austria

    Franz Neubauer

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© 1993 Springer-Verlag Berlin Heidelberg

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Siletto, G.B., Spalla, M.I., Tunesi, A., Lardeaux, J.M., Colombo, A. (1993). Pre-Alpine Structural and Metamorphic Histories in the Orobic Southern Alps, Italy. In: von Raumer, J.F., Neubauer, F. (eds) Pre-Mesozoic Geology in the Alps. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-84640-3_34

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  • DOI: https://doi.org/10.1007/978-3-642-84640-3_34

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-84642-7

  • Online ISBN: 978-3-642-84640-3

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