Mesoarchean migmatites of the Carajás Province : from intra-arc melting to collision.
dc.contributor.author | Silva, Marco Antonio Delinardo da | |
dc.contributor.author | Monteiro, Lena Virginia Soares | |
dc.contributor.author | Santos, Ticiano José Saraiva dos | |
dc.contributor.author | Moreto, Carolina Penteado Natividade | |
dc.contributor.author | Sousa, Soraya Damasceno | |
dc.contributor.author | Faustinoni, Jackeline Monteiro | |
dc.contributor.author | Melo, Gustavo Henrique Coelho de | |
dc.contributor.author | Xavier, Roberto Perez | |
dc.contributor.author | Toledo, Benfica A. M. | |
dc.date.accessioned | 2022-09-14T19:04:00Z | |
dc.date.available | 2022-09-14T19:04:00Z | |
dc.date.issued | 2021 | pt_BR |
dc.description.abstract | In 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. | pt_BR |
dc.identifier.citation | SILVA, M. A. D. da. et al. Mesoarchean migmatites of the Carajás Province: from intra-arc melting to collision. Lithos, v. 388-389, 2021. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0024493721001146>. Acesso em: 29 abr. 2022. | pt_BR |
dc.identifier.doi | https://doi.org/10.1016/j.lithos.2021.106078 | pt_BR |
dc.identifier.issn | 0024-4937 | |
dc.identifier.uri | http://www.repositorio.ufop.br/jspui/handle/123456789/15260 | |
dc.identifier.uri2 | https://www.sciencedirect.com/science/article/pii/S0024493721001146 | pt_BR |
dc.language.iso | en_US | pt_BR |
dc.rights | restrito | pt_BR |
dc.subject | Archean | pt_BR |
dc.subject | Amazonian craton | pt_BR |
dc.title | Mesoarchean migmatites of the Carajás Province : from intra-arc melting to collision. | pt_BR |
dc.type | Artigo publicado em periodico | pt_BR |
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