Mesoarchean migmatites of the Carajás Province : from intra-arc melting to collision.

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorSilva, Marco Antonio Delinardo da-
Autor(es): dc.creatorMonteiro, Lena Virginia Soares-
Autor(es): dc.creatorSantos, Ticiano José Saraiva dos-
Autor(es): dc.creatorMoreto, Carolina Penteado Natividade-
Autor(es): dc.creatorSousa, Soraya Damasceno-
Autor(es): dc.creatorFaustinoni, Jackeline Monteiro-
Autor(es): dc.creatorMelo, Gustavo Henrique Coelho de-
Autor(es): dc.creatorXavier, Roberto Perez-
Autor(es): dc.creatorToledo, Benfica A. M.-
Data de aceite: dc.date.accessioned2025-08-21T15:18:04Z-
Data de disponibilização: dc.date.available2025-08-21T15:18:04Z-
Data de envio: dc.date.issued2022-09-14-
Data de envio: dc.date.issued2022-09-14-
Data de envio: dc.date.issued2020-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/jspui/handle/123456789/15260-
Fonte completa do material: dc.identifierhttps://www.sciencedirect.com/science/article/pii/S0024493721001146-
Fonte completa do material: dc.identifierhttps://doi.org/10.1016/j.lithos.2021.106078-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1009657-
Descrição: dc.descriptionIn the Carajás Domain, northern Carajás Province, Amazonian Craton, the oldest units encompass the Mesoarchean migmatites of the Xicrim-Cateté Orthogranulite and Xingu Complex. The Xicrim-Cateté Orthogranulite underwent early dehydration and late water-fluxed partial melting. The first process resulted in net-structured and schollen migmatites with a pargasite-bearing mafic granulite paleosome. The F-pargasite breakdown produced a neosome with peritectic enstatite, diopside, and plagioclase and a residual amphibole-free mafic granulite. The late water- fluxed partial melting generated quartzofeldspathic leucosomes in shear bands of the NW-SE-trending high-angle transcurrent shear zones. The Xingu Complex is composed of stromatic, net-structured, schollen and schlieren migmatites developed in the late water-fluxed partial melting event. These migmatites have orthogneiss and am- phibolite paleosome and syn-tectonic quartzofeldspathic leucosome and biotite-rich melanosome oriented along a low angle NE-SW to NW-SE gneissic foliation. The Xicrim-Cateté paleosome age remains undefined, but the U–Pb zircon ages of the pyroxene-bearing neosome constraint the dehydration-melting to c. 3.06–2.93 Ga. The εHf data (−2.2 to +1.2) of the neosome tie the dehydration-melting of the pargasite-bearing granulite to the underplate of mantle melts. The Zr-Ti-Y content and Ti/V ratios of the pargasite-bearing granulite suggest a compositional shift of their protoliths from MORB to IAT, characterizing a scenario of subduction installation and magmatic evolution. The Xicrim-Cateté pyroxene-bearing neosome is geochemically similar to the Xingu orthogneiss. Both rocks have a TTG affinity and similar εHf values (+0.8 to +1.6) and crystallization ages (2.94 Ga). It indicates a common source for them and suggests that the dehydration partial melting of the primitive mafic crust produced a signif- icant portion of the TTG felsic continental crust of the Carajás Domain. It probably occurred during the island-arc setting evolution between 3.06 and 2.93 Ga when supra-subduction mantle melts started to trigger the composi- tional differentiation of the mafic crust. The late water-fluxed partial melting was controlled by fluid influx into the structures developed during the regional deformation of the Carajás Domain at c. 2.89–2.85 Ga, likely associated with a collisional event in the Carajás Province.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsrestrito-
Palavras-chave: dc.subjectArchean-
Palavras-chave: dc.subjectAmazonian craton-
Título: dc.titleMesoarchean migmatites of the Carajás Province : from intra-arc melting to collision.-
Aparece nas coleções:Repositório Institucional - UFOP

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