http://www.cnr.it/ontology/cnr/individuo/prodotto/ID29291
The relationship between tectono-metamorphic evolution and argon isotope records in White Mica: constraints from in situ 40Ar -39Ar laser analysis of the Variscan Basement of Sardinia. (Articolo in rivista)
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- Label
- The relationship between tectono-metamorphic evolution and argon isotope records in White Mica: constraints from in situ 40Ar -39Ar laser analysis of the Variscan Basement of Sardinia. (Articolo in rivista) (literal)
- Anno
- 2004-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1093/petrology/egh002 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Di Vincenzo G.; Carosi R.; Palmeri R. (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
- http://petrology.oxfordjournals.org/ (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
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- DOI:10.1093/petrology/egh002.
n.5 (literal)
- Note
- Scopu (literal)
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Istituto di Geoscienze e Georisorse - CNR, via Moruzzi 1, I-56124 Pisa, Italy;
Dipartimento di Scienze della Terra, Università di Pisa, via S. Maria 53, I-56126 Pisa, Italy;
Museo Nazionale dell'Antartide, Università di Siena, via Laterina 8, I-53100 Siena, Italy (literal)
- Titolo
- The relationship between tectono-metamorphic evolution and argon isotope records in White Mica: constraints from in situ 40Ar -39Ar laser analysis of the Variscan Basement of Sardinia. (literal)
- Abstract
- The basement of Sardinia represents a nearly complete section of a segment of the Variscan belt that experienced a polyphase tectonometamorphic evolution and Barrovian metamorphism. This basement is well suited to investigate the relationship between tectono-metamorphic evolution and argon isotope records in white mica. Micaschists from the garnet zone (maximum T of up to 520-560?C) contain two texturally and chemically resolvable generations of white mica: (1) deformed celadonite-rich flakes, defining a relict S1 foliation preserved within the main S2 foliation or enclosed in rotated albite porphyroblasts; (2) celadonite-poor white micas aligned along the main S2 foliation. The S1 foliation developed earlier and at a deeper crustal level with respect to that at which the thermal peak was reached. From the staurolite zone (Tof up to 590---625?C) to the sillimaniteþK-feldspar zone, white mica is nearly uniform in composition (muscovite) and is predominantly aligned along the S2 foliation or is of later crystallization. In situ 40Ar-39Ar laser analyses of white mica yielded ages of ?340-315 Ma in the garnet zone, and ?320---300Ma in the staurolite and sillimanite þ K-feldspar zones. Results highlight a close link between argon isotope records in white mica and both textures and structure-forming major elements. The oldest ages were detected in samples where the earlier syn-D1 white mica generation did not texturally and chemically re-equilibrate at upper-crustal levels. This study suggests that the white micas that escaped recrystallization retain argon isotope records of an earlier metamorphic stage that survived a later event characterized by temperatures higher than 500?C. (literal)
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