New petrological and partly new structural data have been obtained for two sectors of the Orobic Alps, traditionally attributed to different metamorphic zones. Thermo-barometric determinations, supported by microstructural analysis, indicate different pressure-retrograde paths in each sector. Reinterpretation of the available geochronological data indicates a diachronism for the two thermo-mechanical evolutions. In the light of these data, we interpret the retrograde P-T-t path of the VVB rocks as a pre-Permian post-thickening uplift and the retrograde P-T-t evolution of the LB rocks as a Permo-Mesozoic uplift related to the extensional tectonic regime of the Tethyan rifting. -from Authors
Contrasting thermomechanical evolutions in the Southalpine metamorphic basement of the Orobic Alps (Central Alps, Italy) / V. Diella, M.I. Spalla, A. Tunesi. - In: JOURNAL OF METAMORPHIC GEOLOGY. - ISSN 0263-4929. - 10:2(1992), pp. 203-219.
Contrasting thermomechanical evolutions in the Southalpine metamorphic basement of the Orobic Alps (Central Alps, Italy)
M.I. SpallaSecondo
;
1992
Abstract
New petrological and partly new structural data have been obtained for two sectors of the Orobic Alps, traditionally attributed to different metamorphic zones. Thermo-barometric determinations, supported by microstructural analysis, indicate different pressure-retrograde paths in each sector. Reinterpretation of the available geochronological data indicates a diachronism for the two thermo-mechanical evolutions. In the light of these data, we interpret the retrograde P-T-t path of the VVB rocks as a pre-Permian post-thickening uplift and the retrograde P-T-t evolution of the LB rocks as a Permo-Mesozoic uplift related to the extensional tectonic regime of the Tethyan rifting. -from AuthorsPubblicazioni consigliate
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