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.
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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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