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Callegari, Riccardo (2018) Study of nanogranites included in garnets from the Valpelline series (Austrlpine domain, Western Alps). [Magistrali biennali]

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Since their discovery melt inclusions (MI) have been a very useful tool in igneous petrology and from the last decade they represent a novel approach for the study of metamorphic rocks. This work focuses on the investigation of high-grade metapelitic rocks (kinzigites) from the Valpelline Series and on the characterization of the melt inclusions hosted in peritectic garnet. These rocks belong to the Australpine domain of the western Alps and represent portions of the southern continental margin of the alpine Tethys. The partial melting in this rocks occurred at about 750-850 °C and 6-8 kbar during the Permian (300-250 Ma). One hundred and one samples have been collected from the Valpelline Series and seventy-seven thin sections have been prepared from them. Subsequently a preliminary work with the optical microscope has been done in order to identify the most promising samples for the study of MI. A detailed microstructural characterization has been performed on selected samples using electron scanning microscope (SEM-EDS). The inclusions are small in size (< 20 μm) and are of primary origin as testified by their distribution in the cores of peritectic garnet. They are formed by a polycrystalline assemblage of quartz + plagioclase + K-feldspar + biotite and they are call nanogranites or nanogranitoids; no glassy inclusions have been founded in any samples. An important goal of this work was the re-homogenization of MI in order to recover the bulk composition of the trapped melt. This has been done via remelting experiments under confining pressure in a piston cylinder apparatus. The inclusions did not re-homogenize after the first experiment conducted at 800 °C and 10 kbar for 24 hours and, hence, it was necessary to perform a second experiment at 850 °C and 10 kbar for 24 hours. In this case almost all nanogranite inclusions were partially re-melted but some of them displayed interaction with the host garnet, such as the recrystallization of garnet around the inclusions or the crystallization of new phases (e.g., orthopyroxene) at the inclusion wall. This occurs because the trapping temperature of MI was exceeded during the experimental run. One inclusion was almost totally re-homogenized, without clear evidence of overheating. Semi-quantitative analyses have been done using EDAX system. For the first time the probable composition of the melt produced by the partial melting of crustal rocks of the Valpelline Series was analysed (SiO2 ≈ 72%, Na2O ≈2%, CaO ≈0.7%, K2O ≈ 6%, FeO ≈ 4%, Al2O3 ≈ 13 %).This work also confirms the previous temperature estimates from the literature on peak conditions of the Variscan metamorphism.

Item Type:Magistrali biennali
Corsi di Diploma di Laurea:Scuola di Scienze > Geologia e geologia tecnica
Uncontrolled Keywords:Nanogranite, Nanogranitoids, Melt Inclusions, Valpelline Series, Australpine domain, Garnet, Western Alps
Subjects:Area 04 - Scienze della terra > GEO/07 Petrologia e petrografia
Codice ID:61631
Relatore:Cesare, Bernardo
Correlatore:Bartoli, Omar
Data della tesi:07 December 2018
Biblioteca:Polo di Scienze > Dip. Geoscienze - Biblioteca
Tipo di fruizione per il documento:on-line per i full-text
Tesi sperimentale (Si) o compilativa (No)?:Yes


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Acosta-Vigil, A., Buick, I., Hermann, J., Cesare, B., Rubatto, D., London, D. and Morgan VI, G.B. (2010) Mechanisms of crustal anatexis: a geochemical study of partially melted metapelitic enclaves and host dacite, SE Spain. Journal of Petrology 51, 785–821. Cerca con Google

Acosta-Vigil, A., Cesare, B., London, D. and Morgan VI, G.B. (2007) Microstructure and composition of melt inclusions in a crustal anatectic environment, represented by metapelitic enclaves within El Hoyazo Dacites, SE Spain. Chemical Geology 237, 450–65. Cerca con Google

Bartoli, O., Cesare, B., Poli, S., Acosta-Vigil, A., Esposito, R., Turina, A., Bodnar, R.J., Angel R.J. and Hunter, J. (2013a) Nanogranite inclusions in migmatitic garnet: behavior during piston-cylinder remelting experiments. Geofluids 13, 405-420. Cerca con Google

Bartoli, O., Cesare, B., Poli, S., Bodnar, R.J., Acosta-Vigil, A., Frezzotti, M.L. and Meli, S. (2013b) Recovering the composition of melt and the fluid regime at the onset of crustal anatexis and S-type granite formation. Geology 41, 115-118. Cerca con Google

Bartoli, O., Cesare, B., Remusat, L., Acosta-Vigil, A. and Poli, S. (2014) The H2O content of granite embryos. Earth and Planetary Science Letters 395, 281-290. Cerca con Google

Bodnar, R.J. (2003) Reequilibration of fluid inclusions. In I. Samson, A. Anderson, & D. Marshall, eds. Fluid Inclusions: Analysis and Interpretation. Mineral. Assoc. Canada, Short Course 32, 213-230. Cerca con Google

Brown, M. (1994) The generation, segregation, ascent and emplacement of granite magma: the migmatite-to-crustally-derived granite connection in thickened orogen. Earth-Siences Reviews 36, 83-130. Cerca con Google

Carvalho, B., Bartoli, O., Ferri, F. and Cesare, B. (2018) Melt and fluid inclusions in metapelitic migmatites from Ivrea Zone: anatexis and fluid regime of a high-grade terrane. Conference Paper. Cerca con Google

Cesare, B., Acosta-Vigil, A., Bartoli, O. and Ferrero, S. (2015) What can we learn from melt inclusions in migmatites and granulites?. Lithos 239, 186–216. Cerca con Google

Cesare, B., Acosta-Vigil, A., Ferrero, S. and Bartoli, O. (2011) Melt inclusions in migmatites and granulites. Journal of the Virtual Explorer 38, paper 2. Cerca con Google

Cesare, B., Ferrero, S., Salvioli-Mariani, E., Pedron, D. and Cavallo, A. (2009) “Nanogranite” and glassy inclusions: the anatectic melt in migmatites and granulites. Geology 37, 627–30. Cerca con Google

Cesare, B., Maineri, C., Baron Toaldo, A., Pedron, D. and Cavallo, A. (2007) Immiscibility between carbonic fluids and granitic melts during crustal anatexis: a fluid and melt inclusion study in the enclaves of the Neogene Volcanic Province of SE Spain. Chemical Geology 237, 433-449. Cerca con Google

Cesare, B., Salvioli-Mariani, E. and Venturelli, G. (1997) Crustal anatexis and melt extraction during deformation in the restitic xenoliths at El Joyazo (SE Spain). Mineralogical Magazine 61, 15–27. Cerca con Google

Chupin, V.P., Kuzmin, D.V. and Madyukov, I.A. (2006) Melt inclusions in minerals of scapolite-bearing granulites (Lower crustal xenolites from diatremes of the Pamirs). Doklady Earth Sciences 407A, 507-511. Cerca con Google

Compagnoni, R., Dal Piaz, G.V., Hunziker, J.C., Gosso, G., Lombardo, B. and Wlliams P.F. (1977b) The Sesia-Lonzo zone, a slice of continental crust with alpine high pressure-low temperature assemblages in the Western Italian Alps. Rendiconti della Società Italiana di Mineralogia e Petrologia 33, 281-334. Cerca con Google

Dal Piaz, G.V. (1971). La II Zona Dioritico-Kinzigitica tra la Valsesia e la Valle d’Ayas (Alpi Ocidentali). Memoria Delle Scienze Geologiche Italiane 10, 257-278. Cerca con Google

Dal Piaz, G.V. (1999) The Australpine-Piedmont nappe stack and the puzzle of Alpine Tethys. Memorie Delle Scienze Geologiche Italiane 51, 155-176. Cerca con Google

Dal Piaz, G.V. (2001) Tertiary age and paleostructural inferences of the eclogitic imprint in the Australpine outliers and Zermatt-Sass ophiolite, Western Alps. International Journal of Earth Sciences 90, 668-684. Cerca con Google

Dal Piaz, G.V., Bistacchi, A. and Massironi, M. (2003) Geological Outline of the Alps. Episodes 26, 175-180. Cerca con Google

De Leo, S., Biino, G. and Compagnoni, R. (1987) Riequilibrazioni metamorfiche alpine della serie di Valpelline e di Arolla a nord di Bionaz (Valpelline-Aosta). Rendiconti Della Societa Italiana Di Mineralogia e Petrologia 42, 181. Cerca con Google

Diehl, E.A., Masson, R. and Stutz, A.H. (1952) Contributo alla conoscenza del ricoprimento Dent Blanche. Memorie degli Istituti di Geologia e Mineralogia dell’Università di Padova 17, 5. Cerca con Google

Ferrero, S., Bartoli, O., Cesare, B., Salvioli-Mariani, E., Acosta-Vigil, A., Cavallo, A., Groppo, C. and Battiston, S. (2012) Microstructures of melt inclusions in anatectic metasedimentary rocks. Journal of Metamorphic Geology 30, 303-22. Cerca con Google

Ferrero, S., Wunder, B., Walczak, K., O’Brien, P.J. and Ziemann, M.A. (2015) Preserved near ultrahigh-pressure melt from continental crust subducted to mantle depths. Geology 43, 447-450. Cerca con Google

Fossen, H. (2016) Structural Geology, Second Edition. Cambridge University Press. Cerca con Google

Frezzotti, M.L. (2001) Silicate-Melt Inclusions in Magmatic Rocks: Applications to Petrology. Lithos 55, 273–99. Cerca con Google

Gardien, V., Marquer, D. and Reusser, E. (1994) Pre-Alpine metamorphic evolution of the gneisses from the Valpelline serie (Western Alps, Italy). Swiss Journal of Geosciences 74, 489-502. Cerca con Google

Goldstein, R.H. (2003) Petrographic analysis of fluid inclusions. Fluid Inclusions-Analysis and Interpretation 32, 9-54. Cerca con Google

Handy, M.R., Schmid, S.M., Bousquet, R., Kissling, E. and Bernoulli, D. (2010) Reconciling plate-tectonic reconstructions of Alpine Tethys with the geological-geophysical record of spreading and subduction in the Alps. Earth-Science Reviews 102, 121–58. Cerca con Google

Kohn, M.J. and Spear, F. (2000) Retrograde net transfer reaction insurance for pressure-temperature estimates. Geology 28, 1127-1130. Cerca con Google

Kretz, R. (1983) Symbols for rock-forming minerals. American Mineralogist 68, 277-279. Cerca con Google

Le Bayon, B. and Ballèvre, M. (2006) Deformation history of a subducted continental crust (Gran Paradiso, Western Alps): Continuing crustal shortening during exhumation. Journal of Structural Geology 28, 793-815. Cerca con Google

Lowenstern, J.B. (1995) Applications of silicate-melt inclusions to the study of magmatic volatiles. Mineralogical Association of Canada Short Course 23, 71–99. Cerca con Google

Manzotti, P. (2011) Petro-structural map of the Dent Blanche Tectonic System between Valpelline and Valtournenche Valleys,Western Italian Alps. Journal of Maps 7, 340-352. Cerca con Google

Manzotti, P. and Zucali, M. (2013) The Pre-Alpine tectonic history of the Austroalpine continental basement in the Valpelline Unit (Western Italian Alps). Geological Magazine 150, 153-172. Cerca con Google

Manzotti, P., Ballèvre, M., Zucali, M., Robyr, M. and Engi, M. (2014) The Tectonometamorphic Evolution of the Sesia–Dent Blanche Nappes (Internal Western Alps): Review and Synthesis. Swiss Journal of Geosciences 107, 309-336. Cerca con Google

Manzotti, P., Rubatto, D., Darling, J., Zucali, M., Cenki-Tok, B. and Engi, M. (2012) From Permo-Triassic lithospheric thinning to Jurassic rifting at the Adriatic margin: petrological and geochronological record in Valtournenche (Western Italian Alps). Lithos 146–147, 276–92. Cerca con Google

Marchildon, N. and Brown, M. (2001) Melt segregation in late syn-tectonic anatectic migmatites: an example from the Onawa contact aureole, Maine, USA. Physics and Chemistry of the Earth, Part A: Solid Earth and Geodesy 26, 225-229. Cerca con Google

Maze, W.B., Bergman, S.C. and Sisson, V.B. (1981) Direct observations of the formation of fluid primary inclusions. Geological Society of America 13, 506. Cerca con Google

Pennacchioni, G. and Guermani, A. (1993) The mylonites of the Australpine Dent Blanche nappe along the northwestern side of the Valpelline Valley (Italian Western Alps). Memorie Scienze Geologiche 45, 37-55. Cerca con Google

Roedder, E. (1984) Fluid inclusions. Mineralogical Society of America, Reviews in Mineralogy 12, Mineralogical Society of America, Chantilly, Virginia. Cerca con Google

Sawyer, E.W. (2008) Atlas of Migmatites. Mineralogical Association of Canada. The Canadian Mineralogist, Special Publication 9, Quebec City. Cerca con Google

Sawyer, E.W. (2008) Identifying the parts of migmatites in the field in Working of Migmatites. Mineralogical Association of Canada Short Course 38, 29-36. Cerca con Google

Sawyer, E.W. (2008) Working with migmatites: nomenclature for the consituent parts in Working with Migmatites. Mineralogical Association of Canada Short Course 38, 29-36. Cerca con Google

Sisson, V.B., Lovelace, R.B., Maze, W.B. and Bergam, S.C. (1993) Direct observation of primary fluid inclusion formation. Geology 21, 751-754. Cerca con Google

Touret, J.L.R. (2001) Fluids in Metamorphic Rocks. Lithos 55, 1-25. Cerca con Google

Zucali, M. and Roda, M. (2008). Meso and microstructural evolution of the Mont Morion metaintrusive complex (Dent Blanche Nappe, Austroalpine Domain, Valpelline, Western Italian Alpas). Italian Journal of Geosciences 127, 105-123. Cerca con Google

Zucali, M., and Spalla, M.I. (2011) Prograde lawsonite during the flow of continental crust in the Alpine subduction: strain vs. metamorphism partitioning, a filed-analysis approach to infer tectonometamorphic evolution (Sesia-Lanzo Zone, Western Italian Alps). Journal of the Virtual Explorer 33, 381-398. Cerca con Google

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