Late Cryogenian–Ediacaran magmatism in southern Borborema Province, NE Brazil: Ages, sources, petrogenesis, and tectonic setting
The Sergipano Orogenic System (SOS) in southern Borborema Province (NE Brazil) hosts voluminous Neoproterozoic plutonism related to the Brasiliano/Pan-African Orogeny. This paper presents comprehensive whole-rock geochemical data, titanite U-Pb ages, and the first combined zircon U-Pb and Lu-Hf isot...
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Elsevier
2023-11-01
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| Series: | Geoscience Frontiers |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674987123000932 |
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| author | Fábio Santos Pereira Herbet Conceição Maria de Lourdes Silva Rosa Moacyr Moura Marinho Colombo Celso Gaeta Tassinari João Marinho Milhomem Neto Jean-Michel Lafon |
| author_facet | Fábio Santos Pereira Herbet Conceição Maria de Lourdes Silva Rosa Moacyr Moura Marinho Colombo Celso Gaeta Tassinari João Marinho Milhomem Neto Jean-Michel Lafon |
| author_sort | Fábio Santos Pereira |
| collection | DOAJ |
| description | The Sergipano Orogenic System (SOS) in southern Borborema Province (NE Brazil) hosts voluminous Neoproterozoic plutonism related to the Brasiliano/Pan-African Orogeny. This paper presents comprehensive whole-rock geochemical data, titanite U-Pb ages, and the first combined zircon U-Pb and Lu-Hf isotope results for plutonic rocks from the Macururé Domain to constrain their sources, petrogenesis, and tectonic setting. Three magmatic episodes are recognized and record the evolutionary stages of the orogen. (i) Early-collisional magmatism (643–628 Ma) comprises gabbros and diorites with minor tonalites characterized by well-developed tectonic foliation and evidence of solid-state deformation. These rocks are magnesian, high-K calc-alkaline, LILE- and LREE-enriched and provide subchondritic εHf(t) values (−6.5 to −4.7) and Orosirian Hf-TDMC model ages (1.83–1.94 Ga). Such features indicate derivation from a lithospheric mantle source metasomatized by incorporating crustal components through subduction processes prior to magma generation, possibly related to the Rhyacian Orogeny (2.20–1.96 Ga). Extensive mixing/mingling between basaltic and crust-derived magmas took place at lower crustal depths, producing coeval hybrid diorites and quartz-diorites. (ii) Syn-collisional magmatism (630–624 Ma) encompasses biotite- and muscovite-bearing granodiorites and monzogranites, preserving their structures parallel to the schistosity of the country rocks. These rocks are leucocratic, weakly metaluminous to peraluminous, and contain abundant surmicaceous enclaves. Petrographic features and geochemical composition suggest an origin related to the partial melting of graywacke protoliths with a subordinate igneous component. (iii) Late-collisional magmatism (625–600 Ma) includes undeformed and isotropic monzonites and granodiorites, which truncate the regional foliation. These rocks are consistently metaluminous and magnesian, showing affinities with the high-K calc-alkaline to shoshonite series. Trace element modeling with subchondritic εHf(t) values (−8.3 to −4.1) and Paleoproterozoic Hf-TDMC model ages (1.77–2.03 Ga) demonstrate that reworking of ancient lower mafic crust played an important role at this time. The integration of our data with previously published results leads us to conclude that the geodynamic evolution of the SOS along the western Gondwana margin is better explained by large-scale lithospheric extension followed by basin inversion and continental collision. |
| first_indexed | 2024-03-11T18:22:38Z |
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| issn | 1674-9871 |
| language | English |
| last_indexed | 2024-03-11T18:22:38Z |
| publishDate | 2023-11-01 |
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| spelling | doaj.art-e290fe97828c46b1856fb606bf052ecf2023-10-15T04:37:14ZengElsevierGeoscience Frontiers1674-98712023-11-01146101626Late Cryogenian–Ediacaran magmatism in southern Borborema Province, NE Brazil: Ages, sources, petrogenesis, and tectonic settingFábio Santos Pereira0Herbet Conceição1Maria de Lourdes Silva Rosa2Moacyr Moura Marinho3Colombo Celso Gaeta Tassinari4João Marinho Milhomem Neto5Jean-Michel Lafon6Programa de Pós-Graduação em Geologia e Geoquímica (PPGG), Instituto de Geociências, Universidade Federal do Pará (UFPA), 66075-110 Belém, Pará, Brazil; Laboratório de Geologia Isotópica (Pará-Iso), IG-UFPA, 66075-110 Belém, Pará, Brazil; Corresponding author at: Programa de Pós-Graduação em Geologia e Geoquímica (PPGG), Instituto de Geociências (IG), Universidade Federal do Pará (UFPA), 66075-110 Belém, Pará, Brazil.Programa de Pós-Graduação em Geociências e Análise de Bacias (PGAB), Universidade Federal de Sergipe (UFS), 49100-000 São Cristóvão, Sergipe, BrazilPrograma de Pós-Graduação em Geociências e Análise de Bacias (PGAB), Universidade Federal de Sergipe (UFS), 49100-000 São Cristóvão, Sergipe, BrazilInstituto de Geociências, Universidade Federal da Bahia (UFBA), 40170-290 Salvador, Bahia, BrazilInstituto de Geociências, Universidade de São Paulo (USP), 05508-900 São Paulo, BrazilLaboratório de Geologia Isotópica (Pará-Iso), IG-UFPA, 66075-110 Belém, Pará, BrazilLaboratório de Geologia Isotópica (Pará-Iso), IG-UFPA, 66075-110 Belém, Pará, BrazilThe Sergipano Orogenic System (SOS) in southern Borborema Province (NE Brazil) hosts voluminous Neoproterozoic plutonism related to the Brasiliano/Pan-African Orogeny. This paper presents comprehensive whole-rock geochemical data, titanite U-Pb ages, and the first combined zircon U-Pb and Lu-Hf isotope results for plutonic rocks from the Macururé Domain to constrain their sources, petrogenesis, and tectonic setting. Three magmatic episodes are recognized and record the evolutionary stages of the orogen. (i) Early-collisional magmatism (643–628 Ma) comprises gabbros and diorites with minor tonalites characterized by well-developed tectonic foliation and evidence of solid-state deformation. These rocks are magnesian, high-K calc-alkaline, LILE- and LREE-enriched and provide subchondritic εHf(t) values (−6.5 to −4.7) and Orosirian Hf-TDMC model ages (1.83–1.94 Ga). Such features indicate derivation from a lithospheric mantle source metasomatized by incorporating crustal components through subduction processes prior to magma generation, possibly related to the Rhyacian Orogeny (2.20–1.96 Ga). Extensive mixing/mingling between basaltic and crust-derived magmas took place at lower crustal depths, producing coeval hybrid diorites and quartz-diorites. (ii) Syn-collisional magmatism (630–624 Ma) encompasses biotite- and muscovite-bearing granodiorites and monzogranites, preserving their structures parallel to the schistosity of the country rocks. These rocks are leucocratic, weakly metaluminous to peraluminous, and contain abundant surmicaceous enclaves. Petrographic features and geochemical composition suggest an origin related to the partial melting of graywacke protoliths with a subordinate igneous component. (iii) Late-collisional magmatism (625–600 Ma) includes undeformed and isotropic monzonites and granodiorites, which truncate the regional foliation. These rocks are consistently metaluminous and magnesian, showing affinities with the high-K calc-alkaline to shoshonite series. Trace element modeling with subchondritic εHf(t) values (−8.3 to −4.1) and Paleoproterozoic Hf-TDMC model ages (1.77–2.03 Ga) demonstrate that reworking of ancient lower mafic crust played an important role at this time. The integration of our data with previously published results leads us to conclude that the geodynamic evolution of the SOS along the western Gondwana margin is better explained by large-scale lithospheric extension followed by basin inversion and continental collision.http://www.sciencedirect.com/science/article/pii/S1674987123000932Brasiliano/Pan-African OrogenyWestern GondwanaZircon and titanite U-Pb datingHf isotope dataMagma source |
| spellingShingle | Fábio Santos Pereira Herbet Conceição Maria de Lourdes Silva Rosa Moacyr Moura Marinho Colombo Celso Gaeta Tassinari João Marinho Milhomem Neto Jean-Michel Lafon Late Cryogenian–Ediacaran magmatism in southern Borborema Province, NE Brazil: Ages, sources, petrogenesis, and tectonic setting Geoscience Frontiers Brasiliano/Pan-African Orogeny Western Gondwana Zircon and titanite U-Pb dating Hf isotope data Magma source |
| title | Late Cryogenian–Ediacaran magmatism in southern Borborema Province, NE Brazil: Ages, sources, petrogenesis, and tectonic setting |
| title_full | Late Cryogenian–Ediacaran magmatism in southern Borborema Province, NE Brazil: Ages, sources, petrogenesis, and tectonic setting |
| title_fullStr | Late Cryogenian–Ediacaran magmatism in southern Borborema Province, NE Brazil: Ages, sources, petrogenesis, and tectonic setting |
| title_full_unstemmed | Late Cryogenian–Ediacaran magmatism in southern Borborema Province, NE Brazil: Ages, sources, petrogenesis, and tectonic setting |
| title_short | Late Cryogenian–Ediacaran magmatism in southern Borborema Province, NE Brazil: Ages, sources, petrogenesis, and tectonic setting |
| title_sort | late cryogenian ediacaran magmatism in southern borborema province ne brazil ages sources petrogenesis and tectonic setting |
| topic | Brasiliano/Pan-African Orogeny Western Gondwana Zircon and titanite U-Pb dating Hf isotope data Magma source |
| url | http://www.sciencedirect.com/science/article/pii/S1674987123000932 |
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