1,721,108 research outputs found
Structural inheritance and style of reactivation at mid-crustal levels: a case study from the Alpi Apuane (Tuscany, Italy)
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DEFORMAZIONE FINITA DELLA FASE D1 DELL'OROGENESI ALPINA IN TOSCANA MERIDIONALE: CONTRIBUTO DALL'ANALISI DELLE REDUCTION SPOTS NELL'UNITA' DI MONTICIANO-ROCCASTRADA
No full textTectonic history of an accreted sequence: the Colli-Tavarone Unit, Northern Apennines, Italy
No full textThe Colli-Tavarone Unit is characterized by a sequence of Jurassic ophiolites and related sedimentary cover ranging in age from Late Jurassic to Early Paleocene. The structural evolution consists of two main folding phases followed by later deformation events. The D1 phase is characterized by isoclinal similar folds related to non-coaxial deformation. The P/T conditions of the D1 phase have been estimated as 3-4 kbar and 250-350°C. The D2 phase is characterized by overturned parallel folds with a well-developed crenulation cleavage. These pre-Oligocene deformation phases have been related to underthrusting, coherent underplating and exhumation in the Western Tethys accretionary wedge
Transtensional shear zones controlling volcanic eruptions: the Middle Pleistocene Mt Amiata volcano (inner Northern Apenines, Italy)
No full textThe Mt Amiata volcano is characterized by the SW-NE alignment of the eruption centres, as well as other Italian Pleistocene volcanoes. We carried out a structural and kinematic analysis in a broad stripe comprehending the eruption centres and the substratum, towards NE and SW. The results point out that a transtensional left-lateral brittle shear zone affects the pre-Neogene substratum, the Middle Pleistocene volcanic rocks and the Late Pleistocene travertines. This transtensional structure is active since the Early Pliocene. It controlled the location of the eruption centres through pull-apart structures, thus providing the deep structural channels for the uprising of magma to the surface. The Mt Amiata volcano represents a key study area to investigate the Pleistocene to Present relationships between tectonics and magmatism in the Tyrrhenian area. © 2010 Blackwell Publishing Ltd
The overprint of the Alpine tectono-metamorphic evolution on the Hercynian orogen: an example from the Apuane Alps (Northern Apennines, Italy)
No full textThe Apuane Alps represent a tectonic window in the nappe structure of the Northern Apennines. In its lowermost part the Apuan Metamorphic Complex (i.e. "Autochthonous" Auct. and Massa Unit) reveals a polyphase structural pattern, as the result of two main Alpine events of Tertiary age. The first event is responsible for intense isoclinal folding and the development of a pervasive schistosity in greenschist facies, the second is connected with the subsequent late stage uplift.
The pre-Triassic rocks in the core of the main isoclinal anticlines were severely tectonized, completely transposing a pre-existing foliation and a greenschist pre-Alpine synkinematic metamorphism, the traces of which are obvious and widespread.
Hercynian structures of megascopic, mesoscopic and microscopic size are outlined here
Carta Geologico - strutturale della zona di Monte Prana - Pescaglia (Alpi Apuane sud - orientali)
No full textAntarctic Geological Map 1:250.000Series: Coulman Island Quadrangle with Explicative Notes
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