HP tectono‐metamorphic evolution of the Internal Piedmont Zone in Susa Valley (Western Alps): New petrologic insight from garnet+chloritoid‐bearing micaschists and Fe–Ti metagabbro

2020 ◽  
Author(s):  
Stefano Ghignone ◽  
Alessandro Borghi ◽  
Gianni Balestro ◽  
Daniele Castelli ◽  
Marco Gattiglio ◽  
...  
Keyword(s):  
Western Alps ◽  
Metamorphic Evolution ◽  
Piedmont Zone

scholarly journals Metasediments Covering Ophiolites in the HP Internal Belt of the Western Alps: Review of Tectono-Stratigraphic Successions and Constraints for the Alpine Evolution

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 411
Author(s):  
Paola Tartarotti ◽  
Silvana Martin ◽  
Andrea Festa ◽  
Gianni Balestro
Keyword(s):  
High Pressure ◽  
Western Alps ◽  
Metamorphic Evolution ◽  
Alpine Orogeny ◽  
Sedimentary Evolution ◽  
Hp Metamorphism ◽  
Tethys Ocean ◽  
Depositional Setting ◽  
Oceanic Rocks ◽  
Outer Band

Ophiolites of the Alpine belt derive from the closure of the Mesozoic Tethys Ocean that was interposed between the palaeo-Europe and palaeo-Adria continental plates. The Alpine orogeny has intensely reworked the oceanic rocks into metaophiolites with various metamorphic imprints. In the Western Alps, metaophiolites and continental-derived units are distributed within two paired bands: An inner band where Alpine subduction-related high-pressure (HP) metamorphism is preserved, and an outer band where blueschist to greenschist facies recrystallisation due to the decompression path prevails. The metaophiolites of the inner band are hugely important not just because they provide records of the prograde tectonic and metamorphic evolution of the Western Alps, but also because they retain the signature of the intra-oceanic tectono-sedimentary evolution. Lithostratigraphic and petrographic criteria applied to metasediments associated with HP metaophiolites reveal the occurrence of distinct tectono-stratigraphic successions including quartzites with marbles, chaotic rock units, and layered calc schists. These successions, although sliced, deformed, and superposed in complex ways during the orogenic stage, preserve remnants of their primary depositional setting constraining the pre-orogenic evolution of the Jurassic Tethys Ocean.

scholarly journals Tectono-metamorphic evolution of an evaporitic décollement as recorded by mineral and fluid geochemistry: The “Nappe des Gypses” (Western Alps) case study

Lithos ◽  
2020 ◽  
Vol 358-359 ◽  
pp. 105419
Author(s):  
Guillaume Barré ◽  
Pierre Strzerzynski ◽  
Raymond Michels ◽  
Stéphane Guillot ◽  
Pierre Cartigny ◽  
...  
Keyword(s):  
Western Alps ◽  
Fluid Geochemistry ◽  
Metamorphic Evolution

scholarly journals Thermal structure and metamorphic evolution of the Piemont-Ligurian metasediments in the northern Western Alps

2013 ◽  
Vol 106 (1) ◽  
pp. 63-78 ◽  
Author(s):  
François Negro ◽  
Romain Bousquet ◽  
Flurin Vils ◽  
Clara-Marine Pellet ◽  
Jeanette Hänggi-Schaub
Keyword(s):  
Thermal Structure ◽  
Western Alps ◽  
Metamorphic Evolution

Late tectonic and metamorphic evolution of the Piedmont accretionary wedge (Queyras Schistes lustrés, western Alps): Evidences for tilting during Alpine collision

2009 ◽  
Vol 121 (3-4) ◽  
pp. 502-518 ◽  
Author(s):  
Stéphane Schwartz ◽  
Pierre Tricart ◽  
Jean-Marc Lardeaux ◽  
Stéphane Guillot ◽  
Olivier Vidal
Keyword(s):  
Western Alps ◽  
Accretionary Wedge ◽  
Metamorphic Evolution

scholarly journals Pre-Alpine Tectono-Stratigraphic Reconstruction of the Jurassic Tethys in the High-Pressure Internal Piedmont Zone (Stura di Viù Valley, Western Alps)

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 361
Author(s):  
Marcello De Togni ◽  
Marco Gattiglio ◽  
Stefano Ghignone ◽  
Andrea Festa
Keyword(s):  
Western Alps ◽  
Piedmont Zone ◽  
Ocean Ridges ◽  
Stratigraphic Architecture ◽  
Basin Floor ◽  
Slow Spreading ◽  
Mantle Exhumation ◽  
Depositional Setting ◽  
Unconformable Contact ◽  
Stratigraphic Succession

We present a detailed description of the tectono-stratigraphic architecture of the eclogite-facies Internal Piedmont Zone (IPZ) metaophiolite, exposed in the Lanzo Valleys (Western Alps), which represents the remnant of the Jurassic Alpine Tethys. Seafloor spreading and mantle exhumation processes related to the Alpine Tethys evolution strongly conditioned the intra-oceanic depositional setting, which resulted in an articulated physiography and a heterogeneous stratigraphic succession above the exhumed serpentinized mantle. “Complete” and “reduced” successions were recognized, reflecting deposition in morphological or structural lows and highs, respectively. The “complete” succession consists of quartzite, followed by marble and calcschist. The “reduced” succession differs for the unconformable contact of the calcschist directly above mantle rocks, lacking quartzite and gray marble. The serpentinite at the base of this succession is intruded by metagabbro and characterized at its top by ophicalcite horizons. Mafic metabreccia grading to metasandstone mark the transition between the “complete” and “reduced” successions. The character of the reconstructed succession and basin floor physiography of the IPZ metaophiolite is well comparable with the Middle Jurassic–Late Cretaceous succession of both the Queyras Complex (External Piedmont Zone) and the Internal Ligurian Units (Northern Apennines) and with modern slow-spreading mid-ocean ridges.

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