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• W2912021358 abstract "Abstract Neoarchean granitogenesis in the Carajas province, southeastern portion of the Amazonian craton (Brazil), is marked by large volume of magmatic rocks and is recorded strictly in the Sapucaia and Canaa dos Carajas domains (including the Carajas basin). New data from the central portion of the Canaa dos Carajas domain, Vila Uniao area, show that these granitoids encompass a wide compositional range from syenogranites, monzogranites and granodiorites to tonalites and (quartz) diorites. Geochemical data reveals a metaluminous to slightly peraluminous character as well as affinities with the oxidized and reduced ferroan Neoarchean A-type granites from Carajas province. High crystallization conditions are recorded in these granitoids with temperatures from 926 to 831 ℃ and pressures of 814–532 MPa, which represent crystallization at ∼23–13 km depths. Detailed microstructural analysis corroborates the syntectonic emplacement conditions, indicated by microtextural evidence of continuous magmatic to submagmatic deformational processes. Moreover, these microtextures imply dominant deformational temperatures of approximately 500–400 °C, eventually reaching 250–700 °C. U-Pb and Pb-evaporation dating of zircon grains defines homogeneous ages ranging from 2.74 to 2.73 Ga, interpreted as crystallization ages, and corroborates ages recorded for Neoarchean magmatism in Carajas province. The integrated data suggest that, at 2.74–2.73 Ga, this portion of the crust was subjected to an N–S pure shear-dominated transpressional regime, with E–W sinistral sense of tectonic movement, and was responsible for generation of the magma from Vila Uniao granitoids. Textural evidences – as magmatic, submagmatic and solid-state fabrics printed on these granitoids – show that cooling and deformation of these rocks took place coevally, and confirm the syn-tectonic character to the Neoarchean granitoids from Vila Uniao area." @default.
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• W2912021358 date "2019-05-01" @default.
• W2912021358 modified "2023-10-18" @default.
• W2912021358 title "Neoarchean A-type granitoids from Carajás province (Brazil): New insights from geochemistry, geochronology and microstructural analysis" @default.
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• W2912021358 doi "https://doi.org/10.1016/j.precamres.2019.01.010" @default.
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