P-T-t path of the hercynian low pressure rocks from the Mandatoriccio complex (Sila massif, Calabria, Italy): new insights for crustal evolution. (Articolo in rivista)

Type
Label
  • P-T-t path of the hercynian low pressure rocks from the Mandatoriccio complex (Sila massif, Calabria, Italy): new insights for crustal evolution. (Articolo in rivista) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Alternative label
  • Langone A.; Godard G.; Prosser G.; Caggianelli A.; Rottura A.; Tiepolo M. (2010)
    P-T-t path of the hercynian low pressure rocks from the Mandatoriccio complex (Sila massif, Calabria, Italy): new insights for crustal evolution.
    in Journal of metamorphic geology
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Langone A.; Godard G.; Prosser G.; Caggianelli A.; Rottura A.; Tiepolo M. (literal)
Pagina inizio
  • 137 (literal)
Pagina fine
  • 162 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 28 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • In: Journal of Metamorphic Geology, vol. 28 (2) pp. 137 - 162. Blackwell, 2010. (literal)
Note
  • ISI Web of Science (WOS) (literal)
Titolo
  • P-T-t path of the hercynian low pressure rocks from the Mandatoriccio complex (Sila massif, Calabria, Italy): new insights for crustal evolution. (literal)
Abstract
  • The tectono-metamorphic evolution of the Hercynian intermediate-upper crust outcropping in eastern Sila (Calabria, Italy) has been reconstructed, integrating microstructural analysis, P-T pseudosections, mineral isopleths and geochronological data. The studied rocks belong to a nearly complete crustal section that comprises granulite facies metamorphic rocks at the base and granitoids in the intermediate levels. Clockwise P-T paths have been constrained for metapelites of the basal level of the intermediate-upper crust (Umbriatico area). These rocks show noticeable porphyroblastic textures documenting the progressive change from medium-P metamorphic assemblages (garnet- and staurolite-bearing assemblages) towards low-P/high-T metamorphic assemblages (fibrolite- and cordierite-bearing assemblages). Peak-metamorphic conditions of ∼590 °C and 0.35 GPa are estimated by integrating microstructural observations with P-T pseudosections calculated for bulk-rock and reaction-domain compositions. The top level of the intermediate-upper crust (Campana area) recorded only the major heating phase at low-P (∼550 °C and 0.25 GPa), as documented by the static growth of biotite spots and of cordierite and andalusite porphyroblasts in metapelites. In situ U-Th-Pb dating of monazite from schists containing low-P/high-T metamorphic assemblages gave a weighted mean U-Pb concordia age of 299 ± 3 Ma, which has been interpreted as the timing of peak metamorphism. In the framework of the whole Hercynian crustal section the peak of low-P/high-T metamorphism in the intermediate-to-upper crust took place concurrently with granulite facies metamorphism in the lower crust and with emplacement of the granitoids in the intermediate levels. In addition, decompression is a distinctive trait of the P-T evolution both in the lower and upper crust. It is proposed that post-collisional extension, together with exhumation, is the most suitable tectonic setting in which magmatic and metamorphi (literal)
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