Chemical-Abrasion U-Pb zircon geochronology reveals 150 Myr of partial melting events in the Archean crust of the São Francisco Craton

Martins, Lorena; Lana, Cristiano; Mazoz, Ariela; Novo, Tiago Amâncio

doi:10.1016/j.gsf.2021.101289

Cited by 3 publications

(1 citation statement)

References 102 publications

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“…These complexes are predominantly composed of gneissic rocks with a chemical composition similar to Archean TTGs (Noce et al 1997). U-Pb zircon data for these gneisses indicate crystallization ages from 2.91 to 2.76 Ga, with inherited age of 3.20 Ga, and migmatization and metamorphism between 2.76 to 2.63 Ga (Noce et al 1998;Lana et al 2013;Farina et al 2015;Martins et al 2022). Intrusive granitoids, apparently derived from reworking of the TTG crust during the Neoarchean, have U-Pb zircon ages ranging from 2.78 to 2.60 Ga (Carneiro 1992;Noce 1995;Lana et al 2013;Romano et al 2013;Farina et al 2015;Martins et al 2022).…”

Section: Geological Contextmentioning

confidence: 98%

Stratigraphy of the Pitangui Synclinorium, northwest of the Quadrilátero Ferrífero mineral province - Brazil: magmatism and sedimentation from Archean to Neoproterozoic

Marinho¹,

Magalhães²,

Lombello³

et al. 2023

JGSB

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The Pitangui Synclinorium is located in the northwestern portion of the Quadrilátero Ferrífero mineral province, São Francisco Craton, in southeast Brazil. It corresponds to a NW-SE-trending synformal structure composed of an Archean greenstone belt sequence, which is covered by Paleoproterozoic metasedimentary rocks to Neoproterozoic sedimentary rocks, and surrounded by Archean granitegneiss complexes. This study reports the first detailed 1:25,000 scale geological mapping in the Pitangui Synclinorium and provides cartographic, stratigraphic and petrographic improvements, allowing the formalization of its lithostratigraphic units and unraveling the sedimentary and volcanic depositional environments. The Archean Pitangui greenstone belt occurs in most parts of the homonymous synclinorium, and is subdivided into the Pitangui Group and the Antimes Formation. The metavolcanosedimentary sequence of the Pitangui Group comprises basal mafic/ultramafic metavolcanic rocks with subordinate felsic/intermediate metavolcanic and metavolcaniclastic rocks of the Rio Pará Formation, suggesting a bimodal volcanism. It is followed by volcanogenic and chemical metasedimentary rocks of the Rio São João Formation, and pelitic to sandy metasedimentary rocks of the Onça do Pitangui Formation deposited in subaqueous environments mainly corresponding to submarine fan systems. The occurrence of clastic rocks increases towards the top of the sequence. The Antimes Formation comprises quartzites and metaconglomerates related to fluvial and fan delta depositional environments. The Pitangui greenstone belt is overlapped, in the central and northwest regions of the study area, by the Fazenda Tapera Formation, a Paleoproterozoic siliciclastic package containing arkosic metasandstones, metagreywackes and metarhythmites deposited in a shallow marine environment. Subordinated tuff layers occur as ash/fall deposits from distal volcanism. Neoproterozoic clastic-chemical sedimentary rocks of the Bambuí Group cover the northern portions of the synclinorium, and are mainly composed of diamictites, limestones, marls and rhythmites from the Carrancas (lacustrine or restricted marine), Sete Lagoas (shallow marine) and Serra de Santa Helena formations (deep water grading to prodelta and delta front).Stratigraphy of the Pitangui Synclinorium, northwest of the Quadrilátero Ferrífero mineral province -Brazil: magmatism and sedimentation from Archean to Neoproterozoic Accepted manuscript -Uncorrected pre-proof This is a PDF file containing an unedited and non-definitive version of a manuscript that has been accepted for publication by the Journal of the Geological Survey of Brazil -JGSB, which serves to provide early visibility of the article. Being an uncorrected preproof version, errors may appear during the production process (language review, formatting and proof review), and these can affect the final content of the article and all legal disclaimers (https://jgsb.cprm.gov.br/index.php/journal/6).

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Section: Geological Contextmentioning

confidence: 98%

Stratigraphy of the Pitangui Synclinorium, northwest of the Quadrilátero Ferrífero mineral province - Brazil: magmatism and sedimentation from Archean to Neoproterozoic

Marinho¹,

Magalhães²,

Lombello³

et al. 2023

JGSB

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The dynamic Archean to Paleoproterozoic crustal evolution of Brazil: Preface

Moreira¹,

Schannor²,

Cutts³

2022

Geoscience Frontiers

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Secular Evolution of Continents and the Earth System

Cawood

Chowdhury

Mulder

et al. 2022

Reviews of Geophysics

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Our planet is unique in the solar system in having a bimodal distribution of crustal types (continental and oceanic), the presence of liquid water at its surface, an oxygenated atmosphere, and a prolific and diverse biosphere. The evolving yet linked nature of these elements, across the range of spatial and temporal scales that operate on the planet, indicates complex and dynamic cycling between the solid (lithosphere, mantle, and core) and surficial (oceans, atmosphere, and biosphere) reservoirs. This linked evolution occurs in response to heat dissipation from the planet's interior, modulated by input of solar energy to the surficial reservoirs. During its very early history the Earth lacked these crustal and surficial features and, after initial accretion from the solar nebula, likely consisted of a magma ocean (e.g., Elkins-Tanton, 2012). Cooling, density settling, and crystallization resulted in rapid differentiation of the Earth, perhaps over a few tens of millions of years, and included formation of core, mantle, proto-crust, and atmosphere (Figure 1; Elkins-Tanton, 2008. Establishing the cascading succession of

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Chemical-Abrasion U-Pb zircon geochronology reveals 150 Myr of partial melting events in the Archean crust of the São Francisco Craton

Cited by 3 publications

References 102 publications

Stratigraphy of the Pitangui Synclinorium, northwest of the Quadrilátero Ferrífero mineral province - Brazil: magmatism and sedimentation from Archean to Neoproterozoic

Stratigraphy of the Pitangui Synclinorium, northwest of the Quadrilátero Ferrífero mineral province - Brazil: magmatism and sedimentation from Archean to Neoproterozoic

The dynamic Archean to Paleoproterozoic crustal evolution of Brazil: Preface

Secular Evolution of Continents and the Earth System

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