Geochemistry of komatiites and basalts from the Rio das Velhas and Pitangui greenstone belts, São Francisco Craton, Brazil: Implications for the origin, evolution, and tectonic setting

Verma, Sanjeet K.; Oliveira, Elson P.; Silva, Paola M.; Moreno, Juan A.; Amaral, Wagner da Silva

doi:10.1016/j.lithos.2017.04.024

Cited by 24 publications

(8 citation statements)

References 111 publications

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“…Most of the studies (e.g. Nesbitt and Sun, 1976;Arndt and Nesbitt, 1984;Arndt et al, 1997;Hanski et al, 2001;Furnes et al, 2012;Dostal and Mueller, 2013;Angerer et al, 2013;Verma et al, 2017) though suggest diverse origins of Archean komatiites and basalts, the possibility of a genetic connection among them cannot be completely ruled out. Therefore, a geochemical reinvestigation is needed to verify the rationality of the AFC model as an effective mechanism for basalt formation from komatiites in Archean greenstone belts.…”

Section: Modelling Of Melting Fractional Crystallization and Crustal Contaminationmentioning

confidence: 99%

“…However, most other studies (e.g. Nesbitt and Sun, 1976;Arndt and Nesbitt, 1984;Arndt et al, 1997;Hanski et al, 2001;Dostal and Mueller, 2013;Verma et al, 2017) consider diverse origins of komatiites and associated basalts. The relationship of tholeiitic basalts with komatiites and komatiitic basalts is also uncertain as tholeiitic basalts have very different and evolved chemical compositions (Arndt, 1991;Condie, 1994).…”

Section: Introductionmentioning

confidence: 99%

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Genetic relationship among komatiites and associated basalts in the Badampahar greenstone belt (3.25–3.10 Ga), Singhbhum Craton, Eastern India

Ghosh

Vermeesch

Gain

et al. 2019

Precambrian Research

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The ultramafic-mafic volcanic rocks of Archean greenstone belts are important archives for lithospheric and asthenospheric processes of the early Earth. Despite decades of research on this context, many issues still remain unsolved. For example, the process of komatiite magma genesis and the genetic relationship among komatiites, komatiitic basalts and tholeiitic basalts in Archean greenstone belts are not clearly understood. The metavolcanic rocks of the Badampahar greenstone belt (BGB), Singhbhum Craton are studied by major-trace element geochemistry to address the said problems and better understand the evolution of melts in Archean lithosphere. Our research suggests that the protoliths of the metavolcanic rocks were komatiites (both Al -depleted and -undepleted), komatiitic basalts and tholeiitic basalts. The Al-heavy rare earth element (HREE) depleted komatiites were formed by moderate degree mantle melting at a higher depth and the Al-HREE undepleted komatiites are products of moderate to high degree mantle melting at a shallower depth. The melting-assimilationfractional crystallization modelling result shows that komatiitic basalts were generated from Al-undepleted komatiites, and tholeiitic basalts were generated from evolved komatiitic basalts by assimilation and fractional crystallization processes. The older age limit of the BGB is determined to be 3.25 Ga. and the basement of sedimentation and volcanism was composed of plutonic felsic rocks.

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Section: Modelling Of Melting Fractional Crystallization and Crustal Contaminationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Genetic relationship among komatiites and associated basalts in the Badampahar greenstone belt (3.25–3.10 Ga), Singhbhum Craton, Eastern India

Ghosh

Vermeesch

Gain

et al. 2019

Precambrian Research

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“…Crustal contamination during the emplacement of igneous rocks can be assessed from the ratios between REE and HFSE as Nb/Yb, Th/Yb, Nb/La, La/Ta, (La/Yb)n, Y/Nb and Zr/Th known for the mantle and the continental crust [24]. The Th/Yb vs. Nb/Yb diagram that discriminates arc basalts at MORBs and OIBs, as well as crustal contamination [24] [38] [39], displays low-contaminated tholeiitic basalts and calc-alkaline basalts (Th/Yb < 0. 59) in the arc field closer to MORBs; and highly contaminated calc-alkaline dacites (Th/Yb < 0.44) in the arc field also but further from the MORB field (Figure 9).…”

Section: Crustal Contamination In the Basalts And Dacites Of Elogo Co...mentioning

confidence: 99%

“…59) in the arc field closer to MORBs; and highly contaminated calc-alkaline dacites (Th/Yb < 0.44) in the arc field also but further from the MORB field (Figure 9). REE/HFSE ratios, used to assess crustal contamination, are high in the crust and low in the mantle [24]. They are higher in calc-alkaline dacites (La/Nb = 1.55 to 5.89; La/Ta = 17 to 54.5) and in calc-alkaline andesitic basalts and basalts (La/Nb = 1.66 to 5.2;…”

Section: Crustal Contamination In the Basalts And Dacites Of Elogo Co...mentioning

confidence: 99%

Geochemistry and Petrogenesis of Basic and Ultrabasic Rocks Elogo Complex in Ivindo Archean Block (Congo Craton): Geodynamic Implications

Makamba¹,

Bouenitela²,

Matiaba-Bazika³

et al. 2023

OJG

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The Elogo complex is a greenstone belt portion located on the Eastern edge of the Archean Congo craton at the junction with the Paleoproterozoic to Neoproterozoic Sembe Ouesso basin. This study was carried out on this complex to determine the context of the placement of basaltic rocks. Metaluminous tholeiitic basalts (basic and ultrabasic), calc-alkaline basalts, andesitic basalts, and peraluminous calc-alkaline dacites represent greenstones. Tholeiitic and calc-alkaline basalts come from deep enriched and depleted mantle sources, including garnet in fusion residues [Al 2 O 3 /TiO 2 > 16 (16.5 to 35.12) and in some samples between 12.45 to 14.48; CaO/Al 2 O 3 < 1 (0.52 to 0.97) and >1 (1.04 to 1.35) in ten samples and (Gb/Yb) PM > 1]. The calc-alkaline dacites come from a shallow depleted mantle source [Al 2 O 3 /TiO 2 > 16; CaO/Al 2 O 3 < 1 and (Gb/Yb) PM > 1]. Tholeiitic and calc-alkaline basalts have a negative Rb, Ba, Ce, and Nb anomaly without negative Ti anomaly, positive Ta, Pb anomalies, and a lack of significant REE [(La/Yb)n = 0.36 to 0.97 and 1 to 2.15; (Ce/Yb)n = 0.27 to 0.96 and 1.04 to 1.72, respectively] fractionation. High Nb/Th (2 to 10) and Nb/U (1.82 to 26) ratios and low La/Ta (5 to 27) ratios are characteristic of divergent margin magmatic sources. Tholeiitic and calc-alkaline basalts correspond to an extensive back-arc basin-type tectonic setting. Calc-alkaline andesitic basalts and dacites show positive Ba, U, Th, K, La, Ce, Pb, and Li anomalies and negative Nb, Ta, and Ti anomalies reflecting crustal contamination and hydrothermal alteration in a compressive tectonic context as a volcanic arc in a subduction regime marking the interruption of the meso-neoarchean Elogo's opening. Elogo's opening and closing are probably as-

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“…The PGB is interpreted as an ocean basin developed in a collisional zone between two continental blocks, namely the Divinópolis and Belo Horizonte complexes, along the Pitangui lineament (Romano and Paiva 1997). According to Melo-Silva et al (2020) and Verma et al (2017), the PGB basalts have a MORB (mid-ocean ridge basalts) signature and the greenstone belt is related to an active continental margin setting. Based on geochemical data, Brando Soares et al (2020) propose that the PGB developed in a back-arc rift under a thick lithosphere, associated with an oceanic island arc, with subsequent collision.…”

Section: Geological Contextmentioning

confidence: 99%

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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Geochemistry of komatiites and basalts from the Rio das Velhas and Pitangui greenstone belts, São Francisco Craton, Brazil: Implications for the origin, evolution, and tectonic setting

Cited by 24 publications

References 111 publications

Genetic relationship among komatiites and associated basalts in the Badampahar greenstone belt (3.25–3.10 Ga), Singhbhum Craton, Eastern India

Genetic relationship among komatiites and associated basalts in the Badampahar greenstone belt (3.25–3.10 Ga), Singhbhum Craton, Eastern India

Geochemistry and Petrogenesis of Basic and Ultrabasic Rocks Elogo Complex in Ivindo Archean Block (Congo Craton): Geodynamic Implications

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

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Geochemistry of komatiites and basalts from the Rio das Velhas and Pitangui greenstone belts, São Francisco Craton, Brazil: Implications for the origin, evolution, and tectonic setting

Cited by 24 publications

References 111 publications

Genetic relationship among komatiites and associated basalts in the Badampahar greenstone belt (3.25–3.10 Ga), Singhbhum Craton, Eastern India

Genetic relationship among komatiites and associated basalts in the Badampahar greenstone belt (3.25–3.10 Ga), Singhbhum Craton, Eastern India

Geochemistry and Petrogenesis of Basic and Ultrabasic Rocks Elogo Complex in Ivindo Archean Block (Congo Craton): Geodynamic Implications

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

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Genetic relationship among komatiites and associated basalts in the Badampahar greenstone belt (3.25–3.10 Ga), Singhbhum Craton, Eastern India

Genetic relationship among komatiites and associated basalts in the Badampahar greenstone belt (3.25–3.10 Ga), Singhbhum Craton, Eastern India