The generation and evolution of the Archean continental crust: The granitoid story in southeastern Brazil
The Archean Eon was a time of geodynamic changes. Direct evidence of these transitions come from igneous/metaigneous rocks, which dominate cratonic segments worldwide. New data for granitoids from an Archean basement inlier related to the Southern São Francisco Craton (SSFC), are integrated with geo...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-07-01
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| Series: | Geoscience Frontiers |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S167498712200055X |
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| author | Rodrigo S. Marimon Chris J. Hawkesworth Elton L. Dantas Rudolph A.J. Trouw Wilson Teixeira Peter C. Hackspacher Allen Fetter Ciro A. Ávila Silvia Volante Atlas V. Corrêa Neto Everton M. Bongiolo Rodrigo Vinagre Maurício Simon |
| author_facet | Rodrigo S. Marimon Chris J. Hawkesworth Elton L. Dantas Rudolph A.J. Trouw Wilson Teixeira Peter C. Hackspacher Allen Fetter Ciro A. Ávila Silvia Volante Atlas V. Corrêa Neto Everton M. Bongiolo Rodrigo Vinagre Maurício Simon |
| author_sort | Rodrigo S. Marimon |
| collection | DOAJ |
| description | The Archean Eon was a time of geodynamic changes. Direct evidence of these transitions come from igneous/metaigneous rocks, which dominate cratonic segments worldwide. New data for granitoids from an Archean basement inlier related to the Southern São Francisco Craton (SSFC), are integrated with geochronological, isotopic and geochemical data on Archean granitoids from the SSFC. The rocks are divided into three main geochemical groups with different ages: (1) TTG (3.02–2.77 Ga); (2) medium- to high-K granitoids (2.85–2.72 Ga); and (3) A-type granites (2.7–2.6 Ga). The juvenile to chondritic (Hf-Nd isotopes) TTG were divided into two sub-groups, TTG 1 (low-HREE) and 2 (high-HREE), derived from partial melting of metamafic rocks similar to those from adjacent greenstone belts. The compositional diversity within the TTG is attributed to different pressures during partial melting, supported by a positive correlation of Dy/Yb and Sr/Zr, and batch melting calculations. The proposed TTG sources are geochemically similar to basaltic rocks from modern island-arcs, indicating the presence of subduction processes concomitant with TTG emplacement. From ∼2.85 Ga to 2.70 Ga, the dominant rocks were K-rich granitoids. These are modeled as crustal melts of TTG, during regional metamorphism indicative of crustal thickening. Their compositional diversity is linked to: (i) differences in source composition; (ii) distinct melt fractions during partial melting; and (iii) different residual mineralogies reflecting varying P–T conditions. Post-collisional (∼2.7–2.6 Ga) A-type granites reflect rifting in that they were closely followed by extension-related dyke swarms, and they are interpreted as differentiation or partial melting products of magmas derived from subduction-modified mantle. The sequence of granitoid emplacement indicates subduction-related magmatism was followed by crustal thickening, regional metamorphism and crustal melting, and post-collisional extension, similar to that seen in younger Wilson Cycles. It is compelling evidence that plate tectonics was active in this segment of Brazil from ∼3 Ga. |
| first_indexed | 2024-03-12T05:22:15Z |
| format | Article |
| id | doaj.art-f5d3a61abbf7466c95ec1fa0494cbb49 |
| institution | Directory Open Access Journal |
| issn | 1674-9871 |
| language | English |
| last_indexed | 2024-03-12T05:22:15Z |
| publishDate | 2022-07-01 |
| publisher | Elsevier |
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| series | Geoscience Frontiers |
| spelling | doaj.art-f5d3a61abbf7466c95ec1fa0494cbb492023-09-03T07:38:55ZengElsevierGeoscience Frontiers1674-98712022-07-01134101402The generation and evolution of the Archean continental crust: The granitoid story in southeastern BrazilRodrigo S. Marimon0Chris J. Hawkesworth1Elton L. Dantas2Rudolph A.J. Trouw3Wilson Teixeira4Peter C. Hackspacher5Allen Fetter6Ciro A. Ávila7Silvia Volante8Atlas V. Corrêa Neto9Everton M. Bongiolo10Rodrigo Vinagre11Maurício Simon12Depto. de Geologia, IGEO, Universidade Federal do Rio de Janeiro, UFRJ, Rio de Janeiro, RJ, Brazil; Corresponding author.School of Earth Sciences, University of Bristol, Bristol, United KingdomInstituto de Geociências, Universidade de Brasília, UnB, Brasília, DF, BrazilDepto. de Geologia, IGEO, Universidade Federal do Rio de Janeiro, UFRJ, Rio de Janeiro, RJ, BrazilInstituto de Geociências, Universidade de São Paulo, USP, São Paulo, SP, BrazilInstituto de Geociências e Ciências Exatas, Universidade Estadual Paulista, Rio Claro, SP, BrazilInstituto de Geociências e Ciências Exatas, Universidade Estadual Paulista, Rio Claro, SP, BrazilDepto. de Geologia, IGEO, Universidade Federal do Rio de Janeiro, UFRJ, Rio de Janeiro, RJ, BrazilInstitute of Geology, Mineralogy and Geophysics, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany; ISOTOPIA Lab, School of Earth, Atmosphere and Environment, Monash University, Wellington Rd, Clayton, VIC 3800, AustraliaDepto. de Geologia, IGEO, Universidade Federal do Rio de Janeiro, UFRJ, Rio de Janeiro, RJ, BrazilPrograma de Pós-Graduação em Geociências, IG, Universidade Federal do Rio Grande do Sul, UFRGS, Porto Alegre, RS, BrazilDepto. de Geologia, IGEO, Universidade Federal do Rio de Janeiro, UFRJ, Rio de Janeiro, RJ, BrazilDepto. de Geologia, IGEO, Universidade Federal do Rio de Janeiro, UFRJ, Rio de Janeiro, RJ, BrazilThe Archean Eon was a time of geodynamic changes. Direct evidence of these transitions come from igneous/metaigneous rocks, which dominate cratonic segments worldwide. New data for granitoids from an Archean basement inlier related to the Southern São Francisco Craton (SSFC), are integrated with geochronological, isotopic and geochemical data on Archean granitoids from the SSFC. The rocks are divided into three main geochemical groups with different ages: (1) TTG (3.02–2.77 Ga); (2) medium- to high-K granitoids (2.85–2.72 Ga); and (3) A-type granites (2.7–2.6 Ga). The juvenile to chondritic (Hf-Nd isotopes) TTG were divided into two sub-groups, TTG 1 (low-HREE) and 2 (high-HREE), derived from partial melting of metamafic rocks similar to those from adjacent greenstone belts. The compositional diversity within the TTG is attributed to different pressures during partial melting, supported by a positive correlation of Dy/Yb and Sr/Zr, and batch melting calculations. The proposed TTG sources are geochemically similar to basaltic rocks from modern island-arcs, indicating the presence of subduction processes concomitant with TTG emplacement. From ∼2.85 Ga to 2.70 Ga, the dominant rocks were K-rich granitoids. These are modeled as crustal melts of TTG, during regional metamorphism indicative of crustal thickening. Their compositional diversity is linked to: (i) differences in source composition; (ii) distinct melt fractions during partial melting; and (iii) different residual mineralogies reflecting varying P–T conditions. Post-collisional (∼2.7–2.6 Ga) A-type granites reflect rifting in that they were closely followed by extension-related dyke swarms, and they are interpreted as differentiation or partial melting products of magmas derived from subduction-modified mantle. The sequence of granitoid emplacement indicates subduction-related magmatism was followed by crustal thickening, regional metamorphism and crustal melting, and post-collisional extension, similar to that seen in younger Wilson Cycles. It is compelling evidence that plate tectonics was active in this segment of Brazil from ∼3 Ga.http://www.sciencedirect.com/science/article/pii/S167498712200055XGranitoid petrogenesisArchean geodynamicsCrustal evolutionTTGsA-typesBatch melting calculations |
| spellingShingle | Rodrigo S. Marimon Chris J. Hawkesworth Elton L. Dantas Rudolph A.J. Trouw Wilson Teixeira Peter C. Hackspacher Allen Fetter Ciro A. Ávila Silvia Volante Atlas V. Corrêa Neto Everton M. Bongiolo Rodrigo Vinagre Maurício Simon The generation and evolution of the Archean continental crust: The granitoid story in southeastern Brazil Geoscience Frontiers Granitoid petrogenesis Archean geodynamics Crustal evolution TTGs A-types Batch melting calculations |
| title | The generation and evolution of the Archean continental crust: The granitoid story in southeastern Brazil |
| title_full | The generation and evolution of the Archean continental crust: The granitoid story in southeastern Brazil |
| title_fullStr | The generation and evolution of the Archean continental crust: The granitoid story in southeastern Brazil |
| title_full_unstemmed | The generation and evolution of the Archean continental crust: The granitoid story in southeastern Brazil |
| title_short | The generation and evolution of the Archean continental crust: The granitoid story in southeastern Brazil |
| title_sort | generation and evolution of the archean continental crust the granitoid story in southeastern brazil |
| topic | Granitoid petrogenesis Archean geodynamics Crustal evolution TTGs A-types Batch melting calculations |
| url | http://www.sciencedirect.com/science/article/pii/S167498712200055X |
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