Geology of the Piemonte-Ligurian units of the Urtier area (Northwestern Alps – Italy)

References

• Amato, J. M., Johnson, C. M., Baumgartner, L., & Beard, B. L. (1999). Rapid exhumation of the Zermatt-Saas ophiolite deduced from high-precision SmNd and RbSr geochronology. Earth and Planetary Science Letters, 171(3), 425–438. https://doi.org/https://doi.org/10.1016/S0012-821X(99)00161-2
   Web of Science ®Google Scholar
• Argand, E. (1911). Les nappes des recouvrement des Alpes Pennines et leur prolongements structuraux. Mat. Carte géol. Suisse, 31, 1–26.
   Google Scholar
• Argand, E. (1916). Sur l'arc des Alpes Occidentales (pp. 146–151). XIV: Eclogae Geologicae Helvetiae.
   Google Scholar
• Balestro, G., Festa, A., & Dilek, Y. (2019). Structural architecture of the Western Alpine Ophiolites, and the Jurassic seafloor spreading tectonics of the Alpine Tethys. Journal of the Geological Society, 176(5), 913–930. https://doi.org/https://doi.org/10.1144/jgs2018-099
   Web of Science ®Google Scholar
• Ballèvre, M. (1988). Collision continentale et chemins P–T: L’unité pennique du Grand Paradis (Alpes occidentales). Mémoires et Documents du Centre Armoricain d’Etudes Structurales des Socles, 19, 352.
   Google Scholar
• Ballèvre, M., Kienast, J. R., & Vuichard, J. P. (1986). La ‘‘nappe de la Dent Blanche’’ (Alpes occidentales): deux unites austroalpines indépéndantes. Eclogae Geologicae Helvetiae, 79, 57–74.
   Google Scholar
• Ballèvre, M., & Merle, O. (1993). The Combin fault: Compressional reactivation of a late cretaceous–early Tertiary detachment fault in the Western Alps. Schweizerische Mineralogische und Petrographische Mitteilungen, 73, 205–227.
   Google Scholar
• Battiston, P., Benciolini, L., Dal Piaz, G. V., De Vecchi, G., Marchi, G., Martin, S., Polino, R., & Tartarotti, P. (1984). Geologia di una traversa dal Gran Paradiso alla zona Sesia-Lanzo in alta Val Soana, Piemonte. Memorie Società Geologica Italiana, 29, 209–232.
   Google Scholar
• Bearth, P. (1967). Die Ophiolite der Zone von Zermatt-Saas Fee. Beiträge zur geologischen Karte der Schweiz, 132, 1–30.
   Google Scholar
• Beltrando, M., Lister, G. S., Hermann, J., Forster, M., & Compagnoni, R. (2008). Deformation mode switches in the Penninic units of the Urtier Valley (Western Alps): evidence for a dynamic orogen. Journal of Structural Geology, 30(2), 194–219. https://doi.org/https://doi.org/10.1016/j.jsg.2007.10.008
   Web of Science ®Google Scholar
• Beltrando, M., Manatschal, G., Mohn, G., Dal Piaz, G. V., Brovarone, A. V., & Masini, E. (2014). Recognizing remnants of magma-poor rifted margins in high-pressure orogenic belts: The Alpine case study. Earth-Science Reviews, 131, 88–115. https://doi.org/https://doi.org/10.1016/j.earscirev.2014.01.001
   Web of Science ®Google Scholar
• Bertrand, J.-M. (1968). Etude structurale du versant occidental du Massif du Grand Paradis (Alpes Graies). Géologie Alpine, 44, 57–87.
   Google Scholar
• Bigi, G., Cosentino, D., Parotto, M., Sartori, R., & Scandone, P. (1990). Structural model of Italy 1:500.000, sheet 1, S.El.CA., Firenze.
   Google Scholar
• Bistacchi, A., Dal Piaz, G. V., Massironi, M., Zattin, M., & Balestrieri, M. L. (2001). The Aosta–Ranzola extensional fault system and oligocene–present evolution of the Austroalpine–Penninic wedge in the northwestern Alps. International Journal of Earth Sciences, 90(3), 654–667. https://doi.org/https://doi.org/10.1007/s005310000178
   Web of Science ®Google Scholar
• Bousquet, R. (2008). Metamorphic heterogeneities within a single HP unit: Overprint effect or metamorphic mix? Lithos, 103(1-2), 46–69. https://doi.org/https://doi.org/10.1016/j.lithos.2007.09.010
   Web of Science ®Google Scholar
• Brouwer, F. M., Vissers, R. L. M., & Lamb, W. M. (2002). Structure and metamorphism of the Gran Paradiso massif, Western Alps, Italy. Contributions to Mineralogy and Petrology, 143(4), 450–470. https://doi.org/https://doi.org/10.1007/s00410-002-0357-6
   Web of Science ®Google Scholar
• Bucher, S., Schmid, S. M., Bousquet, R., & Fügenschuh, B. (2003). Late-stage deformation in a collisional orogen (Western Alps): Nappe refolding, back-thrusting or normal faulting? Terra Nova, 15(2), 109–117. https://doi.org/https://doi.org/10.1046/j.1365-3121.2003.00470.x
   Web of Science ®Google Scholar
• Bucher, S., Ulardic, C., Bousquet, R., Ceriani, S., Fügenschuh, B., Gouffon, Y., & Schmid, S. M. (2004). Tectonic evolution of the Briançonnais units along a transect (ECORS-CROP) through the Italian–French Western Alps. Eclogae Geologicae Helvetiae, 97(3), 321–345. https://doi.org/https://doi.org/10.1007/s00015-004-1139-0
   Google Scholar
• Burroni, A., Levi, N., Marroni, M., & Pandolfi, L. (2003). Lithostratigraphy and structure of the Lago Nero Unit (Chenaillet Massif, Western Alps): comparison with Internal Liguride Units of Northern Apennines. Ofioliti, 28, 1–11.
   Web of Science ®Google Scholar
• Butler, J. P., Beaumont, C., & Jamieson, R. A. (2013). The Alps 1: A working geodynamic model for burial and exhumation of (ultra)high-pressure rocks in Alpine-type orogens. Earth and Planetary Science Letters, 377–378, 114–131. https://doi.org/https://doi.org/10.1016/j.epsl.2013.06.039
   Web of Science ®Google Scholar
• Compagnoni, R., Elter, G., & Lombardo, B. (1974). Eterogeneità stratigrafica del complesso degli “Gneiss Minuti” nel massiccio cristallino del Gran Paradiso. Memorie della Società geologica Italiana, 13, 227–239.
   Google Scholar
• Dal Piaz, G. V. (1999). The Austroalpine-Piedmont nappe stack and the puzzle of Alpine Tethys. Memorie di Scienze Geologiche, 51, 155–176.
   Google Scholar
• Dal Piaz, G. V. (2001). Geology of the Monte Rosa massif: Historical review and personal comments. Schweizerische Mineralogische und Petrographische Mitteilungen, 81, 275–303.
   Google Scholar
• Dal Piaz, G. V., Bistacchi, A., & Massironi, M. (2003). Geological outline of the Alps. Episodes, 26(3), 175–180. https://doi.org/https://doi.org/10.18814/epiiugs/2003/v26i3/004
   Web of Science ®Google Scholar
• Dal Piaz, G. V., Cortiana, G., Del Mora, A., Martin, S., Pennacchioni, G., & Tartarotti, P. (2001). Tertiary age and paleostructural inferences of the eclogitic imprint in the Austroalpine outliers and Zermatt-Saas ophiolite, western Alps. International Journal of Earth Sciences, 90(3), 668–684. https://doi.org/https://doi.org/10.1007/s005310000177
   Web of Science ®Google Scholar
• Dal Piaz, G. V., Gianotti, F., Monopoli, B., Pennacchioni, G., Tartarotti, P., & Schiavo, A. (2008). Carta Geologica d’Italia alla scala 1:50.000. Foglio 091 Chatillon. Servizio Geologico d’Italia, Roma.
   Google Scholar
• Dal Piaz, G. V., Lombardo, B., & Gosso, G. (1983). Metamorphic evolution of the Mt. Emilius klippe, Dent Blanche nappe, Western Alps. American Journal of Science, 283A, 438–458.
   Google Scholar
• Dal Piaz, G. V., & Nervo, R. (1971). Il lembo di ricoprimento del Glacier-Rafray (Dent Blanche s.l.). Bollettino della Società Geologica Italiana, 90, 401–414.
   Google Scholar
• Dal Piaz, G. V., Nervo, R., & Polino, R. (1979). Carta geologica del lembo del Glacier-Rafray (Dent Blanche s.l.) e note illustrative. Centro studi problemi orogeno Alpi occidentali, CNR Torino, 2, pp. 24.
   Google Scholar
• Decandia, F. A., & Elter, P. (1969). Riflessioni sul problema delle ofioliti nell’Appennino settentrionale. Memorie della Società Toscana di Scienze Naturali, 76, 1.
   Google Scholar
• Decandia, F. A., & Elter, P. (1972). La zona ofiolitifera del Bracco nel settore compreso tra Levanto e la Val Graveglia (Appennino Ligure). Memorie della Società Geologica Italiana, 11, 503–530.
   Google Scholar
• Deville, E., Fudral, S., Lagabrielle, Y., Marthaler, M., & Sartori, M. (1992). From oceanic closure to continental collision: A synthesis of the “Schistes lustrés” metamorphic complex of the Western Alps. Geological Society of America Bulletin, 104(2), 127–139. https://doi.org/https://doi.org/10.1130/0016-7606(1992)104<0127:FOCTCC>2.3.CO;2
   Web of Science ®Google Scholar
• Dewey, J. F., Helman, M. L., Turco, E., Hutton, D. H. W., & Knott, S. D. (1989). Kinematics of the western Mediterranean. In M. P. Coward, D. Dietrich, & R. G. Park (Eds.), Alpine tectonics (pp. 265–283). Geological Society, London, Special Publications, 45.
   Google Scholar
• Ellero, A. (1994). Geologia delle unità ofiolitiche nel Vallone dell’Urtier, Cogne – Alpi Occidentali [Unpublished master's thesis]. University of Pisa.
   Google Scholar
• Ellero, A., & Loprieno, A. (2014). Ophiolitic units of the Northern Apennines as a tool to unravel schistes lustres stratigraphy of the Western Alps and their geodynamic context: the Urtier Valley example, Cogne, Aosta Valley. In I rapporti tra l’Appennino Settentrionale e le Alpi Occidentali: stato dell’arte a 50 anni dalla “Ruga del Bracco” – Convegno in memoria di Piero Elter, 22–23.
   Google Scholar
• Ellero, A., & Loprieno, A. (2018). Nappe stack of Piemonte–Ligurian units south of Aosta Valley: New evidence from Urtier Valley (Western Alps). Geological Journal, 53(5), 1665–1684. https://doi.org/https://doi.org/10.1002/gj.2984
   Web of Science ®Google Scholar
• Elter, G. (1971). Schistes lustrés et ophiolites de la zone piémontaise entre Orco et Doire Baltée (Alpes Graies). Hypothèses sur l’origine des ophiolites. Géologie Alpine, 47, 147–169.
   Google Scholar
• Elter, G. (1972). Contribution a la connaissance du Briançonnais interne et de la bordure piémontaise dans les Alpes Graies nord-orientales et considerations sur les rapports entre les zones du Briançonnais et des Schistes Lustrés. Memorie degli Istituti di Geologia e Mineralogia dell'Università di Padova, 28, 19.
   Google Scholar
• Elter, G. (1987). Carte géologique de la Vallée d'Aoste, échelle 1:100.000. CNR e Centro di studio sui problemi dell'orogeno delle Alpi occidentali, Torino. S.EL.CA., Firenze.
   Google Scholar
• Elter, P. (1975). L’ensemble ligure. Bulletin de la Société Géologique de France, 17(6), 984–997. https://doi.org/https://doi.org/10.2113/gssgfbull.S7-XVII.6.984
   Google Scholar
• Fassmer, K., Obermüller, G., Nagel, T. J., Kirst, F., Froitzheim, N., Sandmann, S., Miladinova, I., Fonseca, R. O. C., & Münker, C. (2016). High-pressure metamorphic age and significance of eclogite-facies continental fragments associated with oceanic lithosphere in the Western Alps (Etirol-Levaz Slice, Valtournenche, Italy). Lithos, 252-253, 145–159. https://doi.org/https://doi.org/10.1016/j.lithos.2016.02.019
   Web of Science ®Google Scholar
• Festa, A., Balestro, G., Dilek, Y., & Tartarotti, P. (2015). A Jurassic oceanic core complex in the high-pressure Monviso ophiolite (western Alps, NW Italy). Lithosphere, 7(6), 646–652. https://doi.org/https://doi.org/10.1130/L458.1
   Web of Science ®Google Scholar
• Inger, S., Ramsbotham, W., Cliff, R. A., & Rex, D. C. (1996). Metamorphic evolution of the Sesia-Lanzo zone, Western Alps: Time constraints from multi-system geochronology. Contributions to Mineralogy and Petrology, 126(1-2), 152–168. https://doi.org/https://doi.org/10.1007/s004100050241
   Web of Science ®Google Scholar
• Lafay, R., Baumgartner, L. P., Schwartz, S., Picazo, S., Montes-Hernandez, G., & Vennemann, T. (2017). Petrologic and stable isotopic studies of a fossil hydrothermal system in ultramafic environment (Chenaillet ophicalcites,Western Alps, France): Processes of carbonate cementation. Lithos, 294-295, 319–338. https://doi.org/https://doi.org/10.1016/j.lithos.2017.10.006
   Web of Science ®Google Scholar
• Lagabrielle, Y., Brovarone, A. V., & Ildefonse, B. (2015). Fossil oceanic core complexes recognized in the blueschist metaophiolites of Western Alps and Corsica. Earth-Science Reviews, 141, 1–26. https://doi.org/https://doi.org/10.1016/j.earscirev.2014.11.004
   Web of Science ®Google Scholar
• Lagabrielle, Y., & Polino, R. (1988). Un schéma structural du domaine des Schistes lustrés ophiolitifères au nord-ouest du massif du Mont Viso (Alpes sud-occidentales) et ses implications. Comptes rendus de l'Académie des Sciences, 306(Série II), 921–928.
   Google Scholar
• Lapen, T. J., Johnson, C. M., Baumgartner, L. P., Dal Piaz, G. V., Skora, S., & Beard, B. L. (2006). Coupling of oceanic and continental crust during eocene eclogite-facies metamorphism: Evidence from the Monte Rosa nappe, western Alps. Contributions to Mineralogy and Petrology, 153(2), 139–157. https://doi.org/https://doi.org/10.1007/s00410-006-0144-x
   Web of Science ®Google Scholar
• Lapen, T. J., Johnson, C. M., Baumgartner, L. P., Mahlen, N. J., Beard, B. L., & Amato, J. M. (2003). Burial rates during prograde metamorphism of an ultra-high-pressure terrane: An example from Lago di cignana, Western Alps, Italy. Earth and Planetary Science Letters, 215(1-2), 57–72. https://doi.org/https://doi.org/10.1016/S0012-821X(03)00455-2
   Web of Science ®Google Scholar
• Le Bayon, B., & Ballèvre, M. (2006). Deformation history of a subducted continental crust (Gran Paradiso, Western Alps): continuing crustal shortening during exhumation. Journal of Structural Geology, 28(5), 793–815. https://doi.org/https://doi.org/10.1016/j.jsg.2006.02.009
   Web of Science ®Google Scholar
• Lemoine, M. (1971). Données nouvelles sur la série du Gondran près de Briancon (Alpes Cottiens). Réflexions sur les problèmes stratigraphiques et paléogeographiques de la zone piémontaise. Géologie Alpine, 47, 181–201.
   Google Scholar
• Lemoine, M. (1980). Serpentinites, gabbros and ophicalcites in the Piemont-Ligurian domain of the Western Alps: possible indicators of oceanic fracture zones and of associated serpentinite protrusions in the Jurassic-Cretaceous Tethys. Archives Des Sciences / Editees Par La Societe De Physique Et D'histoire Naturelle De Geneve, 33, 103–115.
   Google Scholar
• Liati, A., Froitzheim, N., & Fanning, C. M. (2005). Jurassic ophiolites within the Valais domain of the Western and Central Alps: Geochronological evidence for re-rifting of oceanic crust. Contributions to Mineralogy and Petrology, 149(4), 446–461. https://doi.org/https://doi.org/10.1007/s00410-005-0658-7
   Web of Science ®Google Scholar
• Liati, A., Gebauer, D., & Froitzheim, N. (2002). Late Cretaceous basic oceanic magmatism in the Valais ocean, Western and Central Alps: geochronological evidence and paleogeographic implications. Annual meeting of the Swiss academy of natural sciences, Abstract volume, Davos, pp. 26–27.
   Google Scholar
• Loprieno, A. (1994). Studio geologico del Vallone dell’Urtier, Cogne – Alpi Occidentali [Unpublished master's thesis]. University of Pisa.
   Google Scholar
• Loprieno, A., Ellero, A., Elter, P., & Molli, G. (2009). Structural geometries and tectonic evolution of ophiolite and continental units in the Urtier Valley, Cogne (Western Alps). 9th Alpine Workshop “AlpShop 2009”, September 2009, Cogne, Italy.
   Google Scholar
• Michard, A., Goffé, B., Chopin, C., & Henry, C. (1996). Did the Western Alps develop through an Oman-type stage? The geotectonic setting of high-pressure metamorphism in two contrasting Tethyan transects. Eclogae geologicae Helvetiae, 89, 43–80.
   Google Scholar
• Nervo, R., & Polino, R. (1976). Un lembo di cristallino Dent Blanche alla Torre Ponton (Valle d’Aosta). Bollettino- Societa Geologica Italiana, 95, 647–657.
   Google Scholar
• Paganelli, F., Compagnoni, R., Nervo, R., & Tallone, S. (1995). Il lembo Austroalpino di Eaux Rousses e le sue relazioni con la Zona Ofiolitica Piemontese dell’alta Valle di Cogne, Valle d’Aosta meridionale. In R. Polino & R. Sacchi (Eds.), Atti convegno Alpi-Appennino, Peveragno 1994. Accademia Nazionale delle Scienze detta dei XL, Scritti e Documenti (Vol. 14, pp. 335–348).
   Google Scholar
• Pennacchioni, G. (1991). Evoluzione strutturale del M. Emilius (Austroalpino, Alpi occidentali). Rendiconti della Società Geologica Italiana, 14, 97–100.
   Google Scholar
• Pennacchioni, G. (1996). Progressive eclogitization under fluid-present conditions of pre-Alpine mafic granulites in the Austroalpine Mt. Emilius klippe (Italian Western Alps). Journal of Structural Geology, 18(5), 549–561. https://doi.org/https://doi.org/10.1016/S0191-8141(96)80023-X
   Web of Science ®Google Scholar
• Pleuger, J., Roller, S., Walter, J. M., Jansen, E., & Froitzheim, N. (2007). Structural evolution of the contact between two Penninic nappes (Zermatt-Saas zone and Combin zone, Western Alps) and implications for the exhumation mechanism and palaeogeography. International Journal of Earth Sciences, 96(2), 229–252. https://doi.org/https://doi.org/10.1007/s00531-006-0106-6
   Web of Science ®Google Scholar
• Pognante, U. (1989). Lawsonite, blueschist and eclogite formation in the southern Sesia Zone (western Alps, Italy). European Journal of Mineralogy, 1(1), 89–104. https://doi.org/https://doi.org/10.1127/ejm/01/1/0089
   Web of Science ®Google Scholar
• Polino, R., & Lemoine, M. (1984). Détritisme mixte d’origine continentale et océanique dans les sediments jurassico-crétacés supra-ophiolitiques de la Téthys ligure: la série du Lago Nero (Alpes Occidentales franco-italiennes). Comptes rendus de l'Académie des Sciences, 298, 359–364.
   PubMed Web of Science ®Google Scholar
• Radulescu, I. G., Rubatto, D., Gregory, C., & Compagnoni, R. (2009). The age of HP metamorphism in the Gran Paradiso Massif, Western Alps: A petrological and geochronological study of “silvery micaschists”. Lithos, 110(1-4), 95–108. https://doi.org/https://doi.org/10.1016/j.lithos.2008.12.008
   Web of Science ®Google Scholar
• Ramsay, J. C. (1967). Folding and fracturing of rocks. McGraw-Hill.
   Google Scholar
• Ramsbotham, W., Inger, S., Cliff, B., Rex, D., & Barnicoat, A. (1994). Time constraints on the metamorphic and structural evolution of the southern Sesia-Lanzo zone, Western Italian Alps. Mineralogical Magazine, 58A(2), 758–759. https://doi.org/https://doi.org/10.1180/minmag.1994.58A.2.131
   Google Scholar
• Rosenbaum, G., & Lister, G. S. (2005). The Western Alps from the Jurassic to Oligocene: Spatio-temporal constraints and evolutionary reconstructions. Earth-Science Reviews, 69(3-4), 281–306. https://doi.org/https://doi.org/10.1016/j.earscirev.2004.10.001
   Web of Science ®Google Scholar
• Rubatto, D., Gebauer, D., & Compagnoni, R. (1999). Dating of eclogite-facies zircons: The age of Alpine metamorphism in the Sesia-Lanzo zone (western Alps). Earth and Planetary Science Letters, 167(3-4), 141–158. https://doi.org/https://doi.org/10.1016/S0012-821X(99)00031-X
   Web of Science ®Google Scholar
• Schmid, S. M., Fügenschuh, B., Kissling, E., & Schuster, R. (2004). Tectonic map and overall architecture of the Alpine orogen. Eclogae Geologicae Helvetiae, 97(1), 93–117. https://doi.org/https://doi.org/10.1007/s00015-004-1113-x
   Google Scholar
• Schmid, S. M., & Kissling, E. (2000). The arc of the Western Alps in the light of geophysical data on deep crustal structure. Tectonics, 19(1), 62–85. https://doi.org/https://doi.org/10.1029/1999TC900057
   Web of Science ®Google Scholar
• Tartarotti, P., Festa, A., Benciolini, L., & Balestro, G. (2017b). Record of Jurassic mass transport processes through the orogenic cycle: Understanding chaotic rock units in the high-pressure Zermatt-Saas ophiolite (Western Alps). Lithosphere, 9(3), 399–407. https://doi.org/https://doi.org/10.1130/L605.1
   Web of Science ®Google Scholar
• Tartarotti, P., Guerini, S., Rotondo, F., Festa, A., Balestro, G., Bebout, G. E., Cannaò, E., Epstein, G. S., & Scambelluri, M. (2019a). Superposed sedimentary and tectonic block-in-matrix fabrics in a subducted serpentinite mélange (high-pressure Zermatt Saas Ophiolite, Western Alps). Geosciences, 9(8), 358. https://doi.org/https://doi.org/10.3390/geosciences9080358
   Web of Science ®Google Scholar
• Tartarotti, P., Martin, S., Meyzen, C. M., Benciolini, L., & Toffolo, L. (2019b). Structural evolution and metasomatism of subducted metaophiolites in the Northwestern Alps. Tectonics, 38(12), 4185–4206. https://doi.org/https://doi.org/10.1029/2019TC005626
   Web of Science ®Google Scholar
• Tartarotti, P., Martin, S., Monopoli, B., Benciolini, L., Schiavo, A., Campana, R., & Vigni, I. (2017a). Geology of the Saint-Marcel valley metaophiolites (Northwestern Alps, Italy). Journal of Maps, 13(2), 707–717. https://doi.org/https://doi.org/10.1080/17445647.2017.1355853
   Web of Science ®Google Scholar
• Thöni, M. (1999). A review of geochronological data from the eastern Alps. Schweizerische Mineralogische und Petrographische Mitteilungen, 79, 209–230.
   Google Scholar
• Villa, I. M., Bucher, S., Bousquet, R., Kleinhanns, I. C., & Schmid, S. M. (2014). Dating polygenic metamorphic assemblages along a transect across the Western Alps. Journal of Petrology, 55(4), 803–830. https://doi.org/https://doi.org/10.1093/petrology/egu007
   Web of Science ®Google Scholar