Contents lists available at ScienceDirect Journal of South American Earth Sciences journal homepage: www.elsevier.com/locate/jsames Geology and geochemical constraints on the origin of the Mesoarchean granitoids from Carajás province, Amazonian craton Luana Camile Silva-Silva a,b,∗ , Davis Carvalho Oliveira a,b , Diwhemerson Barbosa de Souza a,b a Grupo de Pesquisa Petrologia de Granitoides (GPPG) - Instituto de Geociências (IG), Rua Augusto Corrêa, 01 CEP-66075-900, Belém, PA, Brazil b Programa de Pós-Graduação em Geologia e Geoquímica Universidade Federal do Pará (UFPA) IG-UFPA, Belém, PA, Brazil ARTICLE INFO Keywords: Granitoid Plutonism Geochemistry Archean Carajás Amazonian craton ABSTRACT The Carajás province (CP) is the largest preserved Archean core of the Amazonian craton. In this paper we present a detailed work about the Tucumã area located in the northwestern portion of the Rio Maria domain of the CP, where more detailed studies had not yet been carried out. The new geological and geochemical data obtained allowed the identification of Mesoarchean granitoids of different natures that resemble typical late- Archean granitoids (TTG, leucogranites, sanukitoids and hybrid granites) identified in several cratons around the world. The most extensive unit in the Tucumã area is the Leucomonzogranitic batholith which is intrusive in a tonalite crust of TTG affinity, that exhibits an older N-S structural pattern commonly found in oldest rocks (greenstone belt sequence). The batholith is coeval with small granitoid intrusions that occur as lenses controlled by NE-SW and E-W direction anastomosed shear zones. Apart from the tonalite, these granitoids show affinity with the calc-alkaline series and are individualized in four units. The porphyritic granodiorite is a magnesium- rich unit that has moderate K 2 O/Na 2 O ratio and higher levels of Ba, K and Th, indicating similarities with the Transitional TTG suites (Yilgarn craton). Equigranular granodiorites are equivalent of sanukitoid suites; they show enrichment in Sr and compatible elements (Mg, Cr, and Ni) and depletion in HREE. Hybrid granitoids were identified as High-HFSE granites (medium- and high-Ba) that share some geochemical affinities with Closepet granite of the Dharwar craton. The Leucomonzogranite is enriched in LILE and exhibit negative Eu anomalies, which indicate crustal reworking processes. This granitoids are syntectonic bodies that underwent a progressive deformation processes that started before the magma crystallization was complete, under high temperatures (> 500 °C) conditions compatible with those of the amphibolite facies. Two phases of magmatism are recorded in the RMD, which would be responsible for the formation of these granitoids. The first phase (2.98-2.92 Ga) is related to formation of a thick TTG crust from parcial melting of an oceanic plateau or a thickened mafic crust. The second magmatism phase (~2.87 Ga) initiated due to thermal events in a collisional setting, where both crustal rework processes and generation of juvenile magmatism occurred at the same time, resulting in the formation of heterogeneous plutons, at different crustal levels that were emplaced by mechanisms analogous to diapirs. 1. Introduction The growth of continental crust started with the emergence of the first continents since the beginning of the Archean (4.0 Ga), which originated from chemical differentiation and cooling of the Earth's primitive mantle (Taylor and McLennan, 1995; Hawkesworth et al. 2010; Dhuime et al. 2011). More than 50% of the volume of the con- tinental crust was potentially formed before 2.9 Ga, resulting in the generation of granitoids with a specific geochemical signature, different from those recognized in modern plate tectonics (McLennan and Taylor, 1982; Belousova et al. 2010; Condie and Aster, 2010; Dhuime et al. 2012). The composition of the Archean crust is typically described to be granite-greenstone terranes with a predominance of sodic tonalite- trondhjemite-granodiorite (TTG) suites (Barker and Arth, 1976; Martin, 1987; Moyen and Martin, 2012). However, between 2.95 and 2.55 Ga, this K-poor magmatism was progressively replaced by high-K calc-al- kaline suites, marked by the sudden emergence, on a global scale, of sanukitoid suites (Shirey and Hanson, 1984), whose geochemical sig- natures suggest a metasomatized mantle origin (Halla et al. 2009; Heilimo et al. 2010; Oliveira et al., 2011). Evidence for these https://doi.org/10.1016/j.jsames.2020.102568 Received 18 October 2019; Received in revised form 29 February 2020; Accepted 20 March 2020 ∗ Corresponding author. Grupo de Pesquisa Petrologia de Granitoides (GPPG) - Instituto de Geociências (IG), Rua Augusto Corrêa, 01 CEP-66075-900, Belém, PA, Brazil. E-mail addresses: luana.silva@ig.ufpa.br (L.C. Silva-Silva), davis@ufpa.br (D.C. Oliveira), diw@ufpa.br (D. Barbosa de Souza). Journal of South American Earth Sciences 100 (2020) 102568 Available online 31 March 2020 0895-9811/ © 2020 Elsevier Ltd. All rights reserved. T