New geochronological constraints on the geological evolution of Espinhaço basin within the São Francisco Craton—Brazil

Danderfer, André; Waele, Bert De; Pedreira, Augusto José; Nalini, Hermínio Árias

doi:10.1016/j.precamres.2009.01.002

Cited by 162 publications

(100 citation statements)

References 33 publications

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“…975 Ma and therefore coeval to Rio Preto Group, can be viewed as correlative of the pre-glacial lower Macaúbas Group (Duas Barras and Peixe Bravo formations) exposed in Araçuaí Belt (Pedrosa-Soares et al 2001). Our data also supports Schobbenhaus (1996) suggestion that Santo Onofre and Rio Preto Groups were deposited in a NS-trending rift system, the Macaúbas -Santo Onofre -Rio Preto System, as also emphasized by Danderfer et al (2009) and Caxito et al (2014a).…”

Section: Stratigraphic Correlations and Implications For Evolution Ofsupporting

confidence: 82%

“…1). The single 833 Ma concordant zircon found in the sample, although statistically not representative, is compatible with ages obtained in dykes occurring in the northern Espihanço Range (Danderfer et al 2009). Samples of Canabravinha and Formosa Formations showed a very similar provenance record: a youngest peak of Tonian age, minor Mesoproterozoic peaks, a major age concentration between 1.9 and 2.1 Ga, and minor contribution of Neo-Mesoarchean sources.…”

Section: Possible Source Areassupporting

confidence: 62%

“…1.5 Ga, and ca. 1.2 Ga; Danderfer et al 2009;Chemale et al 2012), and the Macaúbas-Santo Onofre-West Congo basin system (ca. 1 Ga, ca.…”

Section: Introductionmentioning

confidence: 99%

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Stratigraphy, tectonics and detrital zircon U-Pb (LA-ICP-MS) geochronology of the Rio Preto Belt and northern Paramirim corridor, NE, Brazil

et al. 2017

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Two important Proterozoic metasedimentary sequences, the Rio Preto and Santo Onofre Groups, crop out along the northwestern margin of the São Francisco craton and in northern Paramirim corridor, respectively. The Rio Preto Group, involved in the eponymous fold-thrust belt along the northwestern cratonic boundary, comprises the Formosa (garnet schist, quartz-mica schist, quartzite, chlorite-sericite schist and ferriferous quartz schist) and Canabravinha (quartzite, micaceous quartzite, metarhytmite, phylite, schist and metaturbidite) formations. The Santo Onofre Group occurs exclusively in the Paramirim corridor, and is composed of quartzite and minor carbonaceous or Mn-rich phylite. These units record sedimentation in shallow to deep-water marine settings related to rift basins, and were deformed and metamorphosed under greenschist facies conditions during the Brasiliano orogeny. Here we present 427 new detrital zircon U-Pb ages, which constrain the maximum depositional ages of ca. 971 Ma for the Santo Onofre Group, ca. 912 Ma for the Canabravinha Formation, and ca. 965 Ma for the Formosa Formation of the Rio Preto Group. Our data suggests that the Santo Onofre and the Rio Preto Groups accumulated in two distinct basin settings. The latter, composed mostly of sandy rocks, would represent a relatively stable, shallow-marine shelf environment. The Rio Preto Group, with metadiamictite, quartzite, pelitic and rhythmitic rocks, represents a shallow to deep marine environment influenced by gravity flows. Both groups were probably deposited in the Late Tonian, and are potential correlatives of the lower (pre-glacial) units of the Macaú-bas Group of the Araçuaí belt. KEYWORDS:Detrital zircon U-Pb geochronology, Brasiliano orogeny, sedimentary provenance, Rio Preto Belt, Paramirim corridor. RESUMO: Duas importantes sequências metassedimentares proterozoicas ocorrem ao longo da margem noroeste do Cráton do

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Section: Stratigraphic Correlations and Implications For Evolution Ofsupporting

confidence: 82%

Section: Possible Source Areassupporting

confidence: 62%

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Stratigraphy, tectonics and detrital zircon U-Pb (LA-ICP-MS) geochronology of the Rio Preto Belt and northern Paramirim corridor, NE, Brazil

et al. 2017

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“…Several mafic dikes and sills were found in the northern Espinhaço, but none intruded the Sítio Novo and Santo Onofre successions. Danderfer et al (2009) reported one mafic dyke with an age of 854 ± 23 Ma (U-Pb SHRIMP), and suggested that this dike was related to the Santo Onofre rifting. Danderfer and Dardenne (2002) subdivided Santo Onofre Group into three formations, which were laterally and vertically complexly interdigitated and had distinct lithofacies successions (from the base to the top): the Canatiba Formation (carbonaceous, laminated and massive mudstones), Boqueirão Formation (sandstones with minor carbonaceous, laminated and massive mudstones), and João Dias Formation (mainly conglomerates and breccias with minor sandstones and mudstones).…”

Section: Northern Espinhaçomentioning

confidence: 99%

“…1). Several unconformity-bounded stratigraphic successions have been characterized along southern and central Espinhaço regions and within the Paramirim aulacogen (Schobbenhaus 1996, Danderfer & Dardenne 2002, Chemale Jr. et al 2012, Danderfer et al 2009, Alkmim & Martins-Neto 2012, Guadagnin et al 2015, Cruz & Alkmim 2017. Each unconformity-bounded unit has been considered a record of an episode of basin formations within the Congo-São Francisco paleocontinent, beginning at 1.8 Ga. Generally, the Paleo-Mesoproterozoic-age units are mapped as Espinhaço Supergroup, and those of Neoproterozoic age are attributed to the supergroup of São Francisco (Schobbenhaus 1996, Martins-Neto et al 2001, Danderfer & Dardenne 2002, Alkmim & Martins-Neto 2012.…”

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confidence: 99%

Tectonics and sedimentation of the central sector of the Santo Onofre rift, north Minas Gerais, Brazil

Costa

Filho

2017

Braz. J. Geol.

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ABSTRACT:The Santo Onofre Group registers the filling of a Tonian, intracontinental paleo-rift that developed along the northern and central Espinhaço regions. This paper examines this unit in the central Espinhaço region with stratigraphic analysis and U-Pb geochronology, reviewing and dividing into the Canatiba and Rio Peixe Bravo Formations, which include the Barrinha Member. The Canatiba Formation mainly comprises carbon-rich mudstones that were deposited through low-density turbidity flows that alternated with sediment settling under anoxic conditions. The Rio Peixe Bravo Formation consists of a succession of sandstones and minor mudstones, which were deposited through low-to high-density turbidity flows. The Barrinha Member mainly consists of conglomerates and is related to channelized debris flows. Detrital zircon grains show maximum depositional ages of 930 ± 33 Ma and around 865 Ma for the Canatiba and Rio Peixe Bravo Formations, respectively. We interpret the Santo Onofre rifting to be relative younger than that for the Sítio Novo Group and to be a precursor stage of the glacial and post-glacial rift-to-passive margin-related sequences of the Macaúbas Group. The lithostratigraphic term "Macaúbas Supergroup" would be of better use to accommodate the unconformity-bounded Tonian sequences that were related to the Rodinia breakup in the Congo-São Francisco paleocontinent. (Hoffman 1991, Meert 2001. Several phases that involved the breaking of Rodinia occurred, either through passive or active rifting, which were induced by remotely applied tensions (in-plane stress) and mantle plumes, respectively . These processes operated diachronically through a continental mass, and the full disintegration of the continent was complete at the end of the Tonian Period (Hoffman 1991, Cawood et al. 2016. Many rifts were formed before reaching this stage, some of which were aborted, and mafic dyke swarms intruded, which became dispersed in the scattered continents (Chew et al. 2010, Volkert et al. 2015. Investigations of these features have provided a better understanding of the space-temporal evolution of the Rodinia, for reconstructions (Hoffman 1991, Meert 2001. KEYWORDS:The Congo-São Francisco paleocontinent is characterized as one of several fragments of the Rodinia (Hoffman 1991. This paleocontinent encompasses the cover and basement rocks of São Francisco and Congo cratons and their marginal orogenic belts ( Fig. 1; Almeida 1977, Alkmim et al. 1993, Trompette 1994. The Espinhaço mountain range is a remarkable feature that extends with a sub-meridian direction across the entire extent of the Congo-São Francisco paleocontinent. The southern and central Espinhaço range regions integrate the Araçuaí fold and thrust belt as one of the external domains of the Neoproterozoic Araçuaí-West Congo orogen (Almeida 1977, Pedrosa-Soares et al. 1992, while the northern extension occurs along the eastern border of the Paramirim aulacogen, which was partially inverted, and involves the basement in the cover deformation (Schobbenhau...

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Modeling Craton Destruction by Hydration‐Induced Weakening of the Upper Mantle

et al. 2017

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Growing evidence shows that lithospheric mantle beneath cratons may contain a certain amount of water that originated from dehydration of subducted slabs or mantle metasomatism. As water can significantly reduce the viscosity of nominally anhydrous minerals such as olivine, hydration‐induced rheological weakening is a possible mechanism for the lithospheric thinning of cratons. Using 2‐D thermomechanical numerical models, we investigated the influence of water on dislocation and diffusion creep of olivine during the evolution of cratonic lithosphere. Modeling results indicate that dislocation creep of wet olivine alone is insufficient to trigger dramatic lithospheric thinning within a timescale of tens of millions of years, even with an extremely high water content. However, if diffusion creep is incorporated, significant convective instability will occur at the base of the lithosphere and drive lithospheric mantle dripping, which results in intense lithospheric thinning. We performed semianalytical models to better understand the influence of various parameters on the onset of convective instability. The convective instability promoted by hydration weakening drives lithospheric mantle dripping beneath cratons and thus provides a possible mechanism for cratonic thinning.

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New geochronological constraints on the geological evolution of Espinhaço basin within the São Francisco Craton—Brazil

Cited by 162 publications

References 33 publications

Stratigraphy, tectonics and detrital zircon U-Pb (LA-ICP-MS) geochronology of the Rio Preto Belt and northern Paramirim corridor, NE, Brazil

Stratigraphy, tectonics and detrital zircon U-Pb (LA-ICP-MS) geochronology of the Rio Preto Belt and northern Paramirim corridor, NE, Brazil

Tectonics and sedimentation of the central sector of the Santo Onofre rift, north Minas Gerais, Brazil

Modeling Craton Destruction by Hydration‐Induced Weakening of the Upper Mantle

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