Petrological evolution of silica-undersaturated sapphirine-bearing granulite in the Paleoproterozoic Salvador–Curaçá Belt, Bahia, Brazil
Autor: | Johildo Salomão Figueiredo Barbosa, Christian Nicollet, Pierre Sabaté, C. de M.M. Leite, Philippe Goncalves |
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Přispěvatelé: | Laboratoire Chrono-environnement - CNRS - UBFC (UMR 6249) (LCE), Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre, de l'Environnement et de l'Espace de Montpellier (ISTEEM), Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 2 - Sciences et Techniques (UM2), Laboratoire Chrono-environnement ( LCE ), Université Bourgogne Franche-Comté ( UBFC ) -Université de Franche-Comté ( UFC ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Magmas et Volcans ( LMV ), Université Blaise Pascal - Clermont-Ferrand 2 ( UBP ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Université Jean Monnet [Saint-Étienne] ( UJM ) -Centre National de la Recherche Scientifique ( CNRS ), ORSTOM, Isteem Laboratoire de Tectonophysique, Laboratoire Chrono-environnement (UMR 6249) (LCE), Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Université Montpellier 2 - Sciences et Techniques (UM2)-Centre National de la Recherche Scientifique (CNRS) |
Rok vydání: | 2009 |
Předmět: |
010504 meteorology & atmospheric sciences
Metamorphic rock Ultrahigh-temperature metamorphism [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography Geochemistry Metamorphism engineering.material 010502 geochemistry & geophysics 01 natural sciences Retrograde melt-reactions Electron microprobe monazite dating Petrology ComputingMilieux_MISCELLANEOUS [ SDU.STU.PE ] Sciences of the Universe [physics]/Earth Sciences/Petrography 0105 earth and related environmental sciences Pseudosections Charnockite Geology Orogeny Granulite Sapphirine 13. Climate action Monazite engineering Paleoproterozoic orogeny Sillimanite |
Zdroj: | Gondwana Research Gondwana Research, Elsevier, 2009, 15, pp.49-70 Gondwana Research, 2009, 15, pp.49-70 |
ISSN: | 1342-937X 1878-0571 |
DOI: | 10.1016/j.gr.2008.06.005 |
Popis: | The Salvador–Curaca Belt, located in Sao Francisco Craton, Brazil, was subjected to granulite facies metamorphism during the Paleoproterozoic orogeny ( c. 2.0 Ga). Well preserved in enclaves of silica-undersaturated sapphirine-bearing granulite occur in a charnockite outcrop located along a kilometric-scale shear zone. The sapphirine-bearing granulite preserves domains with distinct mineral assemblages that record interactions between melt and peritectic phases (orthopyroxene 1 + spinel 1 + biotite 1 ). Sapphirine was crystallized in the Si-poor cores of the enclaves, sillimanite and spinel–cordierite symplectites in the intermediate Si-rich domains between cores and margins, and garnet and quartz-bearing cordierite/biotite symplectites in Si-rich margins of the enclaves. Melt-rock interactions and metamorphism occurred at ultrahigh temperatures of 900–950 °C at 7.0–8.0 kbar pressures. The mineralogical evolution of the domains reflects not only the influence of changes in bulk composition in the equilibrium volume of the reactions but also P – T changes during orogeny evolution. Electron microprobe dating of monazite both in the sapphirine-bearing granulite and charnockite indicates UHT metamorphism timing at c. 2.08–2.05 Ga that is related to global Paleoproterozoic UHT metamorphic events that occurred during the Columbia supercontinent assembly. |
Databáze: | OpenAIRE |
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