Samuel Moreira Bersan

Universidade do Estado do Rio de Janeiro

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Henrique Bruno

Universidade do Estado do Rio de Janeiro

Mônica Heilbron

Universidade do Estado do Rio de Janeiro

Cláudio de Morisson Valeriano

Universidade do Estado do Rio de Janeiro

Cristiano Lana

Universidade Federal de Ouro Preto

Craig Storey

University of Portsmouth

Rob Strachan

University of Portsmouth

Mike Fowler

University of Portsmouth

André Danderfer

Universidade Federal de Ouro Preto

Hugo Moreira

Université de Montpellier

Carla Neto

Universidade do Estado do Rio de Janeiro

Cooperative Institutions

Universidade do Estado do Rio de Janeiro

Universidade Federal de Ouro Preto

Instituto de Geociencias

University of Portsmouth

National Council for Scientific and Technological Development

Universidade Federal do Rio de Janeiro

Universidade de São Paulo

Universidade Federal de Minas Gerais

Universidade Federal do Espírito Santo

Petrobras (Brazil)

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Record of a Statherian rift-sag basin in the Central Espinhaço Range: Facies characterization and geochronology

Journal of South American Earth Sciences (2017)

Alice Fernanda de Oliveira Costa André Danderfer Samuel Moreira Bersan

Geochronology

10.1016/j.jsames.2017.10.014

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Citations (15)

Rhyacian-Orosirian tectonic history of the Juiz de Fora Complex: Evidence for an Archean crustal reservoir within an island-arc system

Geoscience Frontiers (2021)

Rasec Almeida Vitalino Elizeu Henrique Bruno Samuel Moreira Bersan Lucas Eduardo de Abreu Barbosa Araujo

The southern São Francisco Paleocontinent (SFP) comprises Archean nuclei and Paleoproterozoic complexes encompassing magmatic arcs juxtaposed during a Rhyacian to Orosirian orogenic event. The Juiz de Fora Complex (JFC) represents an imbricated thrust system that comprises orthogranulites with a wide compositional range formed in an intra-oceanic setting during the Siderian to the Orosirian and later accreted to the southeastern margin of the SFP. Here we report new petrological, geochemical, whole-rock Nd and Sr data, as well as zircon U–Pb ages from felsic and mafic orthogranulites from the JFC. The new data is combined with a regional compilation that enables an evaluation of the interaction between magmatism and orogenetic episodes in the context of the consolidation of São Francisco Paleocontinent during the Rhyacian–Orosirian. Pre collisional Island Arc tholeiites (IAT), Tonalites-Trondhjemites-Granodiorites (TTGs) and sanukitoid magmatism occurred from 2200 Ma to 2085 Ma. This was followed by post-collisional magmatism, which is represented by hybrid granitoids coeval with the emplacement of E-MORB basic rocks. Crustal signatures for the Rhyacian to Orosirian evolution are highlighted by the dominance of negative εNd(t) associated with Meso- to Neoarchean Nd TDM model ages as well as inherited zircon grains from the hybrid granitoids. The JFC is extensively highlighted in the literature as a primitive intra-oceanic arc, but here we propose the reworking or recycling of ancient crustal segments within the mature arc stage of the JFC, suggesting a Mesoarchean crustal source involved in the JFC evolution.

Felsic

Continental arc

Island arc

10.1016/j.gsf.2021.101292

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Record of Early Tonian mafic magmatism in the central Espinhaço (Brazil): New insights for break-up of the Neoproterozoic landmass ancestor of São Francisco-Congo paleocontinent

Geoscience Frontiers (2020)

Helen Fonseca Moreira André Danderfer Alice Fernanda Costa Samuel Moreira Bersan Cristiano Lana

Petrological characterization, U–Pb geochronology, Lu–Hf analyses and major and trace element data from mafic intrusions in the Central Espinhaço (central portion of the Brazilian shield) are used here to investigate the geological significance of the Early Neoproterozoic magmatism in the context of the São Francisco-Congo paleocontinent. These mafic bodies are represented by medium to coarse-grained metagabbros with plagioclase, amphibole and clinopyroxene. Zircon U–Pb isotopic data from two samples yielded weighted mean 206Pb/238U ages of 895 ± 3.4 Ma (MSWD = 1.7) and 896 ± 2.4 Ma (MSWD = 0.64), regarded as the best estimates for the crystallization age of these mafic rocks. Major and trace element data (including REEs) show that the gabbros originated from a subalkaline tholeiitic magma, typical of intraplate magmatism. Such rocks are slightly enriched in LREEs and LILEs and depleted in HFSEs. Our new isotope and geochemical data, along with regional knowledge, indicate that these metagabbros mark the beginning of an important Tonian-age extensional tectonic event of the landmass of which the São Francisco-Congo paleocontinent was part (Rodinia supercontinent or Central African block?). We furthermore suggest that these rocks belong to a prominent suite of Tonian-age mafic rocks that mark a diachronic breakup attempt of this landmass which may have occurred from south to north along the Espinhaço mountain range.

Rodinia

Supercontinent

Geochronology

10.1016/j.gsf.2020.02.007

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Citations (20)

Evidence for change in crust formation process during the Paleoarchean in the São Francisco Craton (Gavião Block): Coupled zircon Lu-Hf and U-Pb isotopic analyses and tectonic implications

Precambrian Research (2021)

Cláudia dos Santos Stefano A. Zincone Gláucia Queiroga Samuel Moreira Bersan Cristiano Lana

Hadean

Rodinia

Underplating

10.1016/j.precamres.2021.106472

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Citations (6)

Rhyacian-Orosirian transitional arc-collisional magmatism in the Archean Piedade Microcontinent, southern São Francisco Paleocontinent, Brazil

Precambrian Research (2024)

Mariana Carvalho Henrique Bruno Samuel Moreira Bersan Craig Storey Catherine Mottram

10.1016/j.precamres.2024.107343

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Earth's new tectonic regime at the dawn of the Paleoproterozoic: Hf isotope evidence for efficient crustal growth and reworking in the São Francisco craton, Brazil

Geology (2021)

Henrique Bruno Mônica Heilbron Rob Strachan Mike Fowler Cláudio de Morisson Valeriano

Abstract A zircon Hf isotope data set from Archean and Paleoproterozoic magmatic and metasedimentary rocks of the southern São Francisco craton (Brazil) is interpreted as evidence of accretionary and collisional plate tectonics since at least the Archean-Proterozoic boundary. During the Phanerozoic, accretionary and collisional orogenies are considered the end members of different plate tectonic settings, both involving preexisting stable continental lithosphere and consumption of oceanic crust. However, mechanisms for the formation of continental crust during the Archean and Paleoproterozoic are still debated, with the addition of magmatic rocks to the crust being explained by different geodynamic models. Hf isotopes can be used to quantify the proportion of magmatic addition into the crust: positive εHf values are usually interpreted as indications of magmatic input from the mantle, whereas crust-derived rocks show more negative εHf. We show that the crust of the amalgamated Paleoproterozoic tectonostratigraphic terranes that make up the southern São Francisco craton were generated from different proportions of mantle and crustal isotopic reservoirs. Plate tectonic processes are implied by a consistent sequence of events involving (1) the generation of juvenile subduction-related magmatic arc rocks, followed by (2) collisional orogenesis and remelting of older crust, and (3) post-collisional bimodal magmatism.

Crustal recycling

10.1130/g49024.1

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Citations (10)

Late Tonian (c. 735 Ma) A-type granite magmatism on the passive margin of the São Francisco paleocontinent was coeval with outboard subduction

Precambrian Research (2024)

Gabriel Paravidini Cláudio de Morisson Valeriano Catherine Mottram Rob Strachan Henrique Bruno

Margin (machine learning)

Passive margin

10.1016/j.precamres.2024.107578

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Paleoproterozoic juvenile magmatism within the northeastern sector of the São Francisco paleocontinent: Insights from the shoshonitic high Ba–Sr Montezuma granitoids

Geoscience Frontiers (2020)

Samuel Moreira Bersan Alice Fernanda de Oliveira Costa André Danderfer Francisco Robério de Abreu Cristiano Lana

New, integrated petrographic, mineral chemistry, whole rock geochemical, zircon and titanite U–Pb geochronology, and zircon Hf isotopic data from the Montezuma granitoids, as well as new geochemical results for its host rocks represented by the Corrego Tingui Complex, provides new insights into the late- to post-collisional evolution of the northeastern São Francisco paleocontinent. U–Pb zircon dates from the Montezuma granitoids spread along the Concordia between ca. 2.2 Ga to 1.8 Ga and comprise distinct groups. Group I have crystallization ages between ca. 2.15 Ga and 2.05 Ga and are interpreted as inherited grains. Group II zircon dates vary from 2.04 Ga to 1.9 Ga and corresponds to the crystallization of the Montezuma granitoids, which were constrained at ca. 2.03 Ga by the titanite U–Pb age. Inverse age zoning is common within the ca. 1.8 Ga Group III zircon ages, being related to fluid isotopic re-setting during the Espinhaco rifiting event. Zircon εHf(t) analysis show dominantly positive values for both Group I (−4 to +9) and II (−3 to +8) zircons and TDM2 model ages of 2.7–2.1 Ga and 2.5–1.95 Ga, respectively. Geochemically, the Montezuma granitoids are weakly peraluminous to metaluminous magnesian granitoids, enriched in LILES and LREE, with high to moderate Mg# and depleted in some of the HFSE. Their lithochemical signature, added to the juvenile signature of both inherited and crystallized zircons, allowed its classification as a shoshonitic high Ba–Sr granitoid related to a late- to post-collisional lithosphere delamination followed by asthenospheric upwelling. In this scenario, the partial melting of the lithospheric mantle interacted with the roots of an accreted juvenile intra-oceanic arc, being these hybrid magma interpreted as the source of the Montezuma granitoids. The Córrego Tinguí Complex host rocks are akin to a syn- to late-collisional volcanic arc granitoids originated from the partial melting of ancient crustal rocks. The results presented in this study have revealed the occurrence of juvenile rocks, probably related to an island arc environment, that are exotic in relation to the Paleo- to Neoarchean crust from the São Francisco paleocontinent's core.

Titanite

Geochronology

10.1016/j.gsf.2020.01.017

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Citations (20)

Petrography, geochemistry and geochronology of the potassic granitoids of the Rio Itacambiruçu Supersuite: implications for the Meso- to Neoarchean evolution of the Itacambira-Monte Azul block

Brazilian Journal of Geology (2018)

Samuel Moreira Bersan André Danderfer Filho Francisco Robério de Abreu Cristiano Lana

In the Itacambira-Monte Azul block (BIMA) the Archean rocks are represented by tonalite-trondhjemite-granodiorite (TTGs) of the Porteirinha Complex and by potassic granitoids of the Rio Itacambiruçu Suite that crop out at the Pedra do Urubu (PUp), Rio Gorutuba (RGp), Barrocão (BAp) and Lagoa Nova (LNp) plutons. This work presents new data for the PUp, RGp and BAp. The petrographic and lithochemical analyses allowed the subdivision of the Rio Itacambiruçu Suite in two groups of granitoids: a medium potassium group, represented by the PUp and RGp, and a high potassium group, in which the BAp rocks are inserted. The geochronological data showed different ages for the medium and high potassium groups, with crystallization ages at ca. 2.92 Ga and 2.65 Ga, respectively. Despite the differences observed between these two groups, the chemical signatures of these rocks are compatible with the signature of biotite-granites generated by the reworking of ancient continental crust. Thereby, the data obtained in this work, added to some previously published results, allowed to the identification of two Archean crustal stabilization events recorded in BIMA, one of Mesoarchean age and the other of Neoarchean age. In addition, we propose the lithodemic reclassification of the Rio Itacambiruçu Suite to Rio Itacambiruçu Supersuite.

Geochronology

10.1590/2317-4889201820170131

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Citations (20)

Neoarchean and Rhyacian TTG-Sanukitoid suites in the southern São Francisco Paleocontinent, Brazil: Evidence for diachronous change towards modern tectonics

Geoscience Frontiers (2020)

Henrique Bruno Vitalino Elizeu Mônica Heilbron Cláudio de Morisson Valeriano Rob Strachan

The southern portion of the São Francisco Palaeocontinent in Brazil is denoted by Archean nuclei and Paleoproterozoic magmatic arcs that were amalgamated during Siderian to Orosirian orogenic processes (ca. 2.4–2.1 Ga). New isotopic U–Pb in zircon and Sm–Nd whole rock combined with major and trace element composition analyses constrain the crystallization history of the Neoarchean Piedade block (at ca. 2.6 Ga) and the Paleoproterozoic Mantiqueira Complex (ca. 2.1–1.9 Ga). These therefore display quite different magmatic histories prior to their amalgamation at ca. 2.05 Ga. Sm–Nd and Rb–Sr isotopes imply a mixed mantle-crustal origin for the samples in both units. A complete Palaeoproterozoic orogenic cycle, from subduction to collision and collapse, is recorded in the Piedade Block and the Mantiqueira Complex. Rhyacian to Orosirian subduction processes (ca. 2.2–2.1 Ga) led to the generation of coeval (ca. 2.16 Ga) TTG suites and sanukitoids, followed by late (2.10–2.02 Ga) high-K granitoids that mark the collisional stage. The collisional accretion of the Mantiqueira Complex against the Piedade Block at 2.08–2.04 Ga is also recorded by granulite facies metamorphism in the latter terrane, along the Ponte Nova suture zone. The collisional stage was closely followed by the emplacement of within-plate tholeiites at ca. 2.04 Ga and by alkaline rocks (syenites and enriched basic rocks) at ca. 1.98 Ga, marking the transition to an extensional tectonic regime. The discovery of two episodes of TTG and sanukitoid magmatism, one during the Neoarchean in the Piedade Complex and another during the Rhyacian in the Mantiqueira Complex, indicates that the onset of subduction-related melting of metasomatized mantle was not restricted to Neoarchean times, as generally believed, but persisted much later into the Paleoproterozoic.

Diachronous

Geochronology

10.1016/j.gsf.2020.01.015

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Citations (64)