Mônica Heilbron

Universidade do Estado do Rio de Janeiro

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Cláudio de Morisson Valeriano

Universidade do Estado do Rio de Janeiro

Júlio Almeida

Universidade do Estado do Rio de Janeiro

Henrique Bruno

Universidade do Estado do Rio de Janeiro

Miguel Tupinambá

Universidade do Estado do Rio de Janeiro

Ivo Dussin

Universidade do Estado do Rio de Janeiro

Carla Neto

Universidade do Estado do Rio de Janeiro

Beatriz Paschoal Duarte

Universidade Católica Portuguesa

Wilson Teixeira

Universidade de São Paulo

Samuel Moreira Bersan

Universidade do Estado do Rio de Janeiro

Nuno Machado

Université du Québec à Montréal

Cooperative Institutions

Universidade do Estado do Rio de Janeiro

110

Instituto de Geociencias

Universidade Federal do Rio de Janeiro

Universidade de São Paulo

Petrobras (Brazil)

National Council for Scientific and Technological Development

Universidade Federal de Minas Gerais

Universidade Federal de Ouro Preto

Sociedade Brasileira de Geofísica

Universidade de Brasília

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Tectonic evolution of the Ribeira Belt's tonian magmatic arc and its implications for West Gondwana's amalgamation

Caroline Peixoto Mônica Heilbron Diana Ragatky Cláudio de Morisson Valeriano Richard Armstrong

Back-arc basin

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Pre-rift tectonic scenario of the Eo-Cretaceous Gondwana break-up along SE Brazil–SW Africa: insights from tholeiitic mafic dyke swarms

Figshare (2016)

Júlio Almeida Fátima Blanco de Dios Webster Ueipass Mohriak Cláudio de Morisson Valeriano Mônica Heilbron

This chapter presents a synthesis of the pre-break-up plate tectonics of western Gondwana and the pre- and syn-rift magmatism in the SW South Atlantic margin (Brazil, Uruguay and Argentina) and the conjugate African continental margin (Angola, Namibia and South Africa). An updated database of the geographical locations of the primary available radiometric ages is also included in this work. A systematic analysis of the K–Ar and Ar/Ar ages from outcrops and boreholes shows a marked Mid to Late Jurassic peak in the southernmost segment of the South Atlantic, related to the emplacement of the Karoo volcanics in South Africa and in Argentina (including the Falkland Islands), and an important Early Cretaceous peak with age distributions that are related to the Gondwana break-up and formation of rift basins along the incipient continental margins. In both the southern Brazilian and Argentinian margins, as well as in the conjugate Namibian and South African margins, several igneous centres and basaltic lava flows are suggestive of the influence of mantle plumes in the Early Cretaceous, which were heralded by mafic dyke swarms in Argentina, Brazil, South Africa and Namibia.

10.6084/m9.figshare.3453245

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Pre-rift tectonic scenario of the Eo-Cretaceous Gondwana break-up along SE Brazil–SW Africa: insights from tholeiitic mafic dyke swarms

Geological Society London Special Publications (2013)

Júlio Almeida Fátima Blanco de Dios Webster Ueipass Mohriak Cláudio de Morisson Valeriano Mônica Heilbron

Abstract This chapter presents a synthesis of the pre-break-up plate tectonics of western Gondwana and the pre- and syn-rift magmatism in the SW South Atlantic margin (Brazil, Uruguay and Argentina) and the conjugate African continental margin (Angola, Namibia and South Africa). An updated database of the geographical locations of the primary available radiometric ages is also included in this work. A systematic analysis of the K–Ar and Ar/Ar ages from outcrops and boreholes shows a marked Mid to Late Jurassic peak in the southernmost segment of the South Atlantic, related to the emplacement of the Karoo volcanics in South Africa and in Argentina (including the Falkland Islands), and an important Early Cretaceous peak with age distributions that are related to the Gondwana break-up and formation of rift basins along the incipient continental margins. In both the southern Brazilian and Argentinian margins, as well as in the conjugate Namibian and South African margins, several igneous centres and basaltic lava flows are suggestive of the influence of mantle plumes in the Early Cretaceous, which were heralded by mafic dyke swarms in Argentina, Brazil, South Africa and Namibia. Supplementary material: A complete table with Radiometric ages of Jurassic–Early Cretaceous magmatism in the southern portion of West Gondwana is available at: www.geolsoc.org.uk/SUP18589

10.1144/sp369.24

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Citations (65)

NEOPROTEROZOIC WESTERN GONDWANA ASSEMBLY AND SUBDUCTIONRELATED PLUTONISM: THE ROLE OF THE RIO NEGRO COMPLEX IN THE RIBEIRA BELT

Revista Brasileira de Geociências (2000)

Miguel Tupinambá Wilson Teixeira Mônica Heilbron

The assembly of Western Gondwana, during the Neoproterozoic, involved the São Francisco/West Congo Craton and its passive margins. The Ribeira Belt lies along the Brazilian Atlantic Coast and is one of the products of the supercontinent amalgamation. Collisional processes were preceded by subduction, recorded by the Rio Negro Complex orthogneisses at the Ribeira Belt. Its plutonites represent a gabbrodiorite-tonalite-throndhjemite plutonic series that evolved from 637 Ma (U-Pb zircon age of the tonalite gneiss) to nearly 600 Ma, at the beginning of the collisional event. Field, petrographic, litogeochemical, and isotopic characteristics of the Rio Negro Complex point to magmatism at a very mature oceanic arc or an immature continental crust as seen along attenuated passive margins. In the latter hypothesis, the margin could be related to a microplate or to the Congo/Angola Craton.

Supercontinent

Passive margin

10.25249/0375-7536.2000301007011

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Granulite/charnockite from the Juiz de Fora domain, central segment of the Brasiliano Ribeira Belt

Brazilian Journal of Geology (2000)

Beatriz Paschoal Duarte Mônica Heilbron Mário da Costa Campos Neto

The Ribeira Belt is the product of the last stage of Brasiliano collage in southeastern Brazil. Its Ocidental Terrane comprises the reworked margin of the San Francisco Craton, which is composed by two thrust sheets: the Andrelandia and the Juiz de Fora domains (Heilbron et al. 1998). The latter includes three different tectonically bounded litho-stratigraphic units: pre-1.8 Ga. granulite facies orthogneisses; post-1.8 Ga. metasedimentary rocks; and Brasiliano-Pan-African granitoids and charnockitoids. Each unit comprises a characteristic type of granulite/charnockite. The pre-1.8 Ga. unit is composed of basic to acid orthopyroxene-bearing orthogneisses with a granoblastic fabric. Field and petrological data indicate that granulite metamorphism is the result of infiltration of CO2-rich fluids. A late mylonitic foliation and retrogressive mineral products are contemporaneous to the Brasiliano-Pan-African tectonic stacking. The paragneisses display granulite facies parageneses within a foliated and/or mylonitic structure and show features of in situ migmatization caused by the breakdown of biotite. Charnockite bodies occur as garnet-(orthopyroxene)-bearing leucosomes within the paragneisses and also as isotropic to slightly foliated individualized igneous bodies with enclaves of the other units. They are interpreted as the product of anatexis of the paragneisses with minor contributions of the prthogranulites. Granulite facies metamorphism of the paragneisses, and anhydrous melting were caused by tectonic stacking related to the Brasiliano collage.

Charnockite

Anatexis

Migmatite

10.5327/rbg.v30i3.828

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Ages of Detrital Zircon from Siliciclastic Successions South of the São Francisco Craton, Brazil: Implications for the Evolution of Proterozoic Basins

Gondwana Research (2004)

Cláudia Sayão Valladares Nuno Machado Mônica Heilbron Gilles Gauthier

Siliciclastic

Basement

Orogeny

10.1016/s1342-937x(05)71074-1

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Citations (50)

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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Citations (9)

Geochemistry and geochronology of paleoproterozoic gneissic rocks of the Paraíba do Sul Complex (Quirino Unit), Barra Mansa region, Rio de Janeiro, Brazil

Brazilian Journal of Geology (1997)

Cláudia Sayão Valladares Mônica Heilbron Mário Cesar Heredia de Figueiredo Wilson Teixeira

This paper presents and discusses new geochemical data from orthogneisses rocks of Paraiba do Sul Complex (PSC) from the NW of the Rio de Janeiro State, denominated Quirino Unit. U-Pb geochronological data (carried out on GEOTOP-UQAM, Canada), displayed in Valladares (1996) and Machado et al. (1996), are also discuss. This Unit, as well the Metasedimentary Unit of PSC and intrusive brazilian granitoids, comprise the Paraiba do Sul Tectonic Domain (PSTD) or Upper Tectonic Domain, at the central segment of the Ribeira belt. The Quirino Unit occurs as extensive bodies of homogeneous gneisses of upper amphibolite facies metamorphism, with hornblende and or biotite comprising approximately 50% of the studied area and ca. 70% of the PSTD. This unit yields U-Pb zircon ages of 2185±3 Ma and 2169±3 Ma, temporally related to the Transamazonian event. Minimum ages of 2846 Ma and 2981 Ma (zircon U-Pb data) reveal the pre-existence of Archean crust as Pb source of part of the investigated gneisses. Geochemical studies of orthogneisses Quirino discriminate two calc-alkaline suites: one of medium to high-K and other of high-K, with enrichment in LILE. The chemical characteristics and the ages U-Pb allow to perform a tectonic correlation of the Quirino Unit with arc magmatic calc-alkaline granitoids, which were generated during the Transamazonian orogeny (2.2 - 1.9 Ga). Ages between 605-503 Ma (zircon and sphene U-Pb data) indicate reworking of Quirino Unit during Brazilian Orogeny (ca. 700-450 Ma).

Geochronology

Orogeny

Continental arc

Lile

10.5327/rbg.v27i1.579

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Citations (5)

LITOGEOQUÍMICA DE DIQUES DE DIABÁSIO DA FAIXA COLATINA, ES

Geochimica Brasiliensis (2009)

Sérgio de Castro Valente T. X. C. Dutra Mônica Heilbron Artur Corval Péter Szatmári

This paper presents the results of a lithogeochemical study on the dolerites that cropout within the so-called Colatina Lineament in the State of Espirito Santo, Brazil. Previous work have shown that these dolerites may be associated with the geodynamic processes related with the Gondwana break-up in Lower Cretaceous times. The lithogeochemical data obtained for the Colatina dolerites allow their classification as basalts and andesitic basalts that comprise a low-TiO 2 suite witin a subalkaline tholeiitic series. The evolutive process was fractional crystallization without concomitant crustal assimilation. Trace element data for the parental composition indicate that these dolerites are related to mantle sources involving at least a contribution of the subcontinental lithospheric mantle.

10.21715/gb.v23i2.305

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Citations (5)

Origin and radiogenic isotope fingerprinting of aerosols over the Southwestern Atlantic and corresponding Southern Ocean Sector

Aeolian Research (2020)

Elaine Alves dos Santos Heitor Evangelista Cláudio de Morisson Valeriano Carla Neto Alexandre Castagna

Radiogenic nuclide

10.1016/j.aeolia.2020.100596

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Citations (6)