Nature and tectonic affinity of the Paleoproterozoic basement of the Central Terrane, Araçuaí-Ribeira Orogenic System (SE-Brazil): Constraints from zircon U-Pb geochronology, whole-rock geochemistry and Nd-Sr isotopes

Sandro Mauri; Monica Heilbron; Henrique Bruno; Gabriel Paravidini; Rodson de Abreu Marques; Ariadne Marra de Souza; Glenn Chapman; Caroline Cibele Vieira Soares; Rob Strachan; Catherine Mottram; Samuel Bersan; Fernando Dangremon Viana; Claudio de Morisson Valeriano; Craig Storey

doi:10.1016/j.jsames.2026.106071

Nature and tectonic affinity of the Paleoproterozoic basement of the Central Terrane, Araçuaí-Ribeira Orogenic System (SE-Brazil): Constraints from zircon U-Pb geochronology, whole-rock geochemistry and Nd-Sr isotopes

Sandro Mauri
, Monica Heilbron
, Henrique Bruno
, Gabriel Paravidini
, Rodson de Abreu Marques
, Ariadne Marra de Souza
, Glenn Chapman
, Caroline Cibele Vieira Soares
, Rob Strachan
, Catherine Mottram
, Samuel Bersan
, Fernando Dangremon Viana
, Claudio de Morisson Valeriano
, Craig Storey

Research output: Contribution to journal › Article › peer-review

36 Downloads (Pure)

Abstract

The Paleoproterozoic basement of the Central Terrane, exposed in the central segment of the Araçuaí-Ribeira Orogenic System (SE-Brazil), provides key constraints on crustal evolution and pre-Brasiliano paleogeography in the region. New zircon U-Pb ages, whole-rock geochemical and Nd-Sr isotopic data, and regional comparisons reveal that this basement shares a similar evolutionary history with Paleoproterozoic units in the southern sector of the São Francisco Paleocontinent. Hbl orthogneisses yield Rhyacian (c. 2.09 Ga) crystallization ages and geochemical features typical of TTG suites, including high Sr/Y ratios (342), strongly fractionated REE patterns, positive Eu anomalies (Eu/Eu∗ = 2.52) and juvenile signatures (ɛNd_i = +5.8). These characteristics match those of coeval units related to continental magmatic arcs in the Mantiqueira and Juiz de Fora complexes and in the Mineiro Belt along the southern margin of the São Francisco Paleocontinent. A Statherian mafic pulse (c. 1.68 Ga), represented by an E-MORB orthoamphibolite (ɛNd_i = +2.7), marks a crustal extension stage in the tectonic evolution of the Central Terrane basement. The data strongly support a model in which the Central Terrane represents a ribbon-type microcontinent derived from the São Francisco Paleocontinent. The detachment of this ribbon occurred at c. 1.00-0.95 Ga during the breakup of the São Francisco-Congo Paleocontinent and opening of the Adamastor Ocean. This ribbon microcontinent, together with other fragments, reconverged during the Ediacaran, forming the continental block that hosted the Inner Cordilleran magmatic arc during the final closure of the Adamastor Ocean. Thus, the Paleoproterozoic basement of the Central Terrane constitutes a key element for reconstructing the paleogeographic framework of Western Gondwana assembly.

Original language	English
Article number	106071
Number of pages	36
Journal	Journal of South American Earth Sciences
Volume	177
Early online date	10 Apr 2026
DOIs	https://doi.org/10.1016/j.jsames.2026.106071
Publication status	Published - 1 Jun 2026

Keywords

Ribbon microcontinent
Paleoproterozoic
Zircon U-Pb geochronology
São Francisco Paleocontinent
Araçuaí-Ribeira Orogenic System

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10.1016/j.jsames.2026.106071

Nature and tectonic affinity of the Paleoproterozoic basementAccepted author manuscript (Post-print), 2.62 MBLicence: CC BY

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Mauri, S., Heilbron, M., Bruno, H., Paravidini, G., Marques, R. D. A., Souza, A. M. D., Chapman, G., Soares, C. C. V., Strachan, R., Mottram, C., Bersan, S., Viana, F. D., Valeriano, C. D. M., & Storey, C. (2026). Nature and tectonic affinity of the Paleoproterozoic basement of the Central Terrane, Araçuaí-Ribeira Orogenic System (SE-Brazil): Constraints from zircon U-Pb geochronology, whole-rock geochemistry and Nd-Sr isotopes. Journal of South American Earth Sciences, 177, Article 106071. https://doi.org/10.1016/j.jsames.2026.106071

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title = "Nature and tectonic affinity of the Paleoproterozoic basement of the Central Terrane, Ara{\c c}ua{\'i}-Ribeira Orogenic System (SE-Brazil): Constraints from zircon U-Pb geochronology, whole-rock geochemistry and Nd-Sr isotopes",

abstract = "The Paleoproterozoic basement of the Central Terrane, exposed in the central segment of the Ara{\c c}ua{\'i}-Ribeira Orogenic System (SE-Brazil), provides key constraints on crustal evolution and pre-Brasiliano paleogeography in the region. New zircon U-Pb ages, whole-rock geochemical and Nd-Sr isotopic data, and regional comparisons reveal that this basement shares a similar evolutionary history with Paleoproterozoic units in the southern sector of the S{\~a}o Francisco Paleocontinent. Hbl orthogneisses yield Rhyacian (c. 2.09 Ga) crystallization ages and geochemical features typical of TTG suites, including high Sr/Y ratios (342), strongly fractionated REE patterns, positive Eu anomalies (Eu/Eu∗ = 2.52) and juvenile signatures (ɛNdi = +5.8). These characteristics match those of coeval units related to continental magmatic arcs in the Mantiqueira and Juiz de Fora complexes and in the Mineiro Belt along the southern margin of the S{\~a}o Francisco Paleocontinent. A Statherian mafic pulse (c. 1.68 Ga), represented by an E-MORB orthoamphibolite (ɛNdi = +2.7), marks a crustal extension stage in the tectonic evolution of the Central Terrane basement. The data strongly support a model in which the Central Terrane represents a ribbon-type microcontinent derived from the S{\~a}o Francisco Paleocontinent. The detachment of this ribbon occurred at c. 1.00-0.95 Ga during the breakup of the S{\~a}o Francisco-Congo Paleocontinent and opening of the Adamastor Ocean. This ribbon microcontinent, together with other fragments, reconverged during the Ediacaran, forming the continental block that hosted the Inner Cordilleran magmatic arc during the final closure of the Adamastor Ocean. Thus, the Paleoproterozoic basement of the Central Terrane constitutes a key element for reconstructing the paleogeographic framework of Western Gondwana assembly.",

keywords = "Ribbon microcontinent, Paleoproterozoic, Zircon U-Pb geochronology, S{\~a}o Francisco Paleocontinent, Ara{\c c}ua{\'i}-Ribeira Orogenic System",

author = "Sandro Mauri and Monica Heilbron and Henrique Bruno and Gabriel Paravidini and Marques, \{Rodson de Abreu\} and Souza, \{Ariadne Marra de\} and Glenn Chapman and Soares, \{Caroline Cibele Vieira\} and Rob Strachan and Catherine Mottram and Samuel Bersan and Viana, \{Fernando Dangremon\} and Valeriano, \{Claudio de Morisson\} and Craig Storey",

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month = jun,

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doi = "10.1016/j.jsames.2026.106071",

language = "English",

volume = "177",

journal = "Journal of South American Earth Sciences",

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Mauri, S, Heilbron, M, Bruno, H, Paravidini, G, Marques, RDA, Souza, AMD, Chapman, G, Soares, CCV, Strachan, R , Mottram, C, Bersan, S, Viana, FD, Valeriano, CDM & Storey, C 2026, 'Nature and tectonic affinity of the Paleoproterozoic basement of the Central Terrane, Araçuaí-Ribeira Orogenic System (SE-Brazil): Constraints from zircon U-Pb geochronology, whole-rock geochemistry and Nd-Sr isotopes', Journal of South American Earth Sciences, vol. 177, 106071. https://doi.org/10.1016/j.jsames.2026.106071

Nature and tectonic affinity of the Paleoproterozoic basement of the Central Terrane, Araçuaí-Ribeira Orogenic System (SE-Brazil): Constraints from zircon U-Pb geochronology, whole-rock geochemistry and Nd-Sr isotopes. / Mauri, Sandro; Heilbron, Monica; Bruno, Henrique et al.
In: Journal of South American Earth Sciences, Vol. 177, 106071, 01.06.2026.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Nature and tectonic affinity of the Paleoproterozoic basement of the Central Terrane, Araçuaí-Ribeira Orogenic System (SE-Brazil): Constraints from zircon U-Pb geochronology, whole-rock geochemistry and Nd-Sr isotopes

AU - Mauri, Sandro

AU - Heilbron, Monica

AU - Bruno, Henrique

AU - Paravidini, Gabriel

AU - Marques, Rodson de Abreu

AU - Souza, Ariadne Marra de

AU - Chapman, Glenn

AU - Soares, Caroline Cibele Vieira

AU - Strachan, Rob

AU - Mottram, Catherine

AU - Bersan, Samuel

AU - Viana, Fernando Dangremon

AU - Valeriano, Claudio de Morisson

AU - Storey, Craig

PY - 2026/6/1

Y1 - 2026/6/1

N2 - The Paleoproterozoic basement of the Central Terrane, exposed in the central segment of the Araçuaí-Ribeira Orogenic System (SE-Brazil), provides key constraints on crustal evolution and pre-Brasiliano paleogeography in the region. New zircon U-Pb ages, whole-rock geochemical and Nd-Sr isotopic data, and regional comparisons reveal that this basement shares a similar evolutionary history with Paleoproterozoic units in the southern sector of the São Francisco Paleocontinent. Hbl orthogneisses yield Rhyacian (c. 2.09 Ga) crystallization ages and geochemical features typical of TTG suites, including high Sr/Y ratios (342), strongly fractionated REE patterns, positive Eu anomalies (Eu/Eu∗ = 2.52) and juvenile signatures (ɛNdi = +5.8). These characteristics match those of coeval units related to continental magmatic arcs in the Mantiqueira and Juiz de Fora complexes and in the Mineiro Belt along the southern margin of the São Francisco Paleocontinent. A Statherian mafic pulse (c. 1.68 Ga), represented by an E-MORB orthoamphibolite (ɛNdi = +2.7), marks a crustal extension stage in the tectonic evolution of the Central Terrane basement. The data strongly support a model in which the Central Terrane represents a ribbon-type microcontinent derived from the São Francisco Paleocontinent. The detachment of this ribbon occurred at c. 1.00-0.95 Ga during the breakup of the São Francisco-Congo Paleocontinent and opening of the Adamastor Ocean. This ribbon microcontinent, together with other fragments, reconverged during the Ediacaran, forming the continental block that hosted the Inner Cordilleran magmatic arc during the final closure of the Adamastor Ocean. Thus, the Paleoproterozoic basement of the Central Terrane constitutes a key element for reconstructing the paleogeographic framework of Western Gondwana assembly.

AB - The Paleoproterozoic basement of the Central Terrane, exposed in the central segment of the Araçuaí-Ribeira Orogenic System (SE-Brazil), provides key constraints on crustal evolution and pre-Brasiliano paleogeography in the region. New zircon U-Pb ages, whole-rock geochemical and Nd-Sr isotopic data, and regional comparisons reveal that this basement shares a similar evolutionary history with Paleoproterozoic units in the southern sector of the São Francisco Paleocontinent. Hbl orthogneisses yield Rhyacian (c. 2.09 Ga) crystallization ages and geochemical features typical of TTG suites, including high Sr/Y ratios (342), strongly fractionated REE patterns, positive Eu anomalies (Eu/Eu∗ = 2.52) and juvenile signatures (ɛNdi = +5.8). These characteristics match those of coeval units related to continental magmatic arcs in the Mantiqueira and Juiz de Fora complexes and in the Mineiro Belt along the southern margin of the São Francisco Paleocontinent. A Statherian mafic pulse (c. 1.68 Ga), represented by an E-MORB orthoamphibolite (ɛNdi = +2.7), marks a crustal extension stage in the tectonic evolution of the Central Terrane basement. The data strongly support a model in which the Central Terrane represents a ribbon-type microcontinent derived from the São Francisco Paleocontinent. The detachment of this ribbon occurred at c. 1.00-0.95 Ga during the breakup of the São Francisco-Congo Paleocontinent and opening of the Adamastor Ocean. This ribbon microcontinent, together with other fragments, reconverged during the Ediacaran, forming the continental block that hosted the Inner Cordilleran magmatic arc during the final closure of the Adamastor Ocean. Thus, the Paleoproterozoic basement of the Central Terrane constitutes a key element for reconstructing the paleogeographic framework of Western Gondwana assembly.

KW - Ribbon microcontinent

KW - Paleoproterozoic

KW - Zircon U-Pb geochronology

KW - São Francisco Paleocontinent

KW - Araçuaí-Ribeira Orogenic System

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DO - 10.1016/j.jsames.2026.106071

M3 - Article

SN - 0895-9811

VL - 177

JO - Journal of South American Earth Sciences

JF - Journal of South American Earth Sciences

M1 - 106071

ER -

Mauri S, Heilbron M, Bruno H, Paravidini G, Marques RDA, Souza AMD et al. Nature and tectonic affinity of the Paleoproterozoic basement of the Central Terrane, Araçuaí-Ribeira Orogenic System (SE-Brazil): Constraints from zircon U-Pb geochronology, whole-rock geochemistry and Nd-Sr isotopes. Journal of South American Earth Sciences. 2026 Jun 1;177:106071. Epub 2026 Apr 10. doi: 10.1016/j.jsames.2026.106071