Rapid magma ascent and formation of the Águas Belas-Canindé granitic batholith, NE Brazil: evidence of epidote dissolution and thermobarometry
Abstract Mineral chemistry and intensive parameter estimates for the Major Isidoro (626 Ma) and Monteirópolis (627 Ma) magmatic epidote-bearing granitic plutons, emplaced along the Jacaré dos Homens transpressional shear zone (JHSZ), Borborema Province, are focused in this study. These plutons consi...
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| Format: | Article |
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Sociedade Brasileira de Geologia
2020-09-01
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| Series: | Brazilian Journal of Geology |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892020000200611&tlng=en |
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| author | Thyego Roberto da Silva Valderez Pinto Ferreira Mariucha Maria Correia de Lima Alcides Nóbrega Sial |
| author_facet | Thyego Roberto da Silva Valderez Pinto Ferreira Mariucha Maria Correia de Lima Alcides Nóbrega Sial |
| author_sort | Thyego Roberto da Silva |
| collection | DOAJ |
| description | Abstract Mineral chemistry and intensive parameter estimates for the Major Isidoro (626 Ma) and Monteirópolis (627 Ma) magmatic epidote-bearing granitic plutons, emplaced along the Jacaré dos Homens transpressional shear zone (JHSZ), Borborema Province, are focused in this study. These plutons consist of medium-to-coarse grained equigranular to porphyritic tonalite to granite that show abundant dioritic enclaves. These granites contain biotite (Fe# 0.44 to 0.55), Fe-edenite (Major Isidoro), hastingsite (Monteirópolis), titanite, and epidote that often show allanite core as key mafic mineral phases. Pistacite molecular content in epidote is in the interval of 27 to 31 mol%, presenting TiO2 < 0.30%, typical for magmatic epidote. Estimated intensive parameters reveal crystallization at 6.5 ± 1 (Major Isidoro) and 4.7 ± 0.6 kbar (Monteirópolis), temperatures from ~940°C (near-liquidus) to 675 ± 35°C (near-solidus) and oxidizing conditions. Partial corrosion of epidote took place during 15.6 to 32 (Major Isidoro) and 27-49 years (Monteirópolis), corresponding to rather high magma ascension rates of 365 to 750 and 395 to 635 m.years-1, respectively. The JHSZ likely favored upward magma transport at the Sergipano and Pernambuco-Alagoas domains boundary, during the onset of the Brasiliano orogeny (650-620 Ma). |
| first_indexed | 2024-12-17T20:08:04Z |
| format | Article |
| id | doaj.art-d57512a9ba8b44ed9a781cace1d5ca96 |
| institution | Directory Open Access Journal |
| issn | 2317-4692 |
| language | English |
| last_indexed | 2024-12-17T20:08:04Z |
| publishDate | 2020-09-01 |
| publisher | Sociedade Brasileira de Geologia |
| record_format | Article |
| series | Brazilian Journal of Geology |
| spelling | doaj.art-d57512a9ba8b44ed9a781cace1d5ca962022-12-21T21:34:17ZengSociedade Brasileira de GeologiaBrazilian Journal of Geology2317-46922020-09-0150210.1590/2317-4889202020190110Rapid magma ascent and formation of the Águas Belas-Canindé granitic batholith, NE Brazil: evidence of epidote dissolution and thermobarometryThyego Roberto da Silvahttps://orcid.org/0000-0002-4072-9643Valderez Pinto Ferreirahttps://orcid.org/0000-0003-3220-7113Mariucha Maria Correia de Limahttps://orcid.org/0000-0003-4169-2712Alcides Nóbrega Sialhttps://orcid.org/0000-0001-7584-0600Abstract Mineral chemistry and intensive parameter estimates for the Major Isidoro (626 Ma) and Monteirópolis (627 Ma) magmatic epidote-bearing granitic plutons, emplaced along the Jacaré dos Homens transpressional shear zone (JHSZ), Borborema Province, are focused in this study. These plutons consist of medium-to-coarse grained equigranular to porphyritic tonalite to granite that show abundant dioritic enclaves. These granites contain biotite (Fe# 0.44 to 0.55), Fe-edenite (Major Isidoro), hastingsite (Monteirópolis), titanite, and epidote that often show allanite core as key mafic mineral phases. Pistacite molecular content in epidote is in the interval of 27 to 31 mol%, presenting TiO2 < 0.30%, typical for magmatic epidote. Estimated intensive parameters reveal crystallization at 6.5 ± 1 (Major Isidoro) and 4.7 ± 0.6 kbar (Monteirópolis), temperatures from ~940°C (near-liquidus) to 675 ± 35°C (near-solidus) and oxidizing conditions. Partial corrosion of epidote took place during 15.6 to 32 (Major Isidoro) and 27-49 years (Monteirópolis), corresponding to rather high magma ascension rates of 365 to 750 and 395 to 635 m.years-1, respectively. The JHSZ likely favored upward magma transport at the Sergipano and Pernambuco-Alagoas domains boundary, during the onset of the Brasiliano orogeny (650-620 Ma).http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892020000200611&tlng=enPernambuco-Alagoas Domaincalc-alkaline orogenic granitescrystallization conditionsmagmatic epidotehigh ascension rates |
| spellingShingle | Thyego Roberto da Silva Valderez Pinto Ferreira Mariucha Maria Correia de Lima Alcides Nóbrega Sial Rapid magma ascent and formation of the Águas Belas-Canindé granitic batholith, NE Brazil: evidence of epidote dissolution and thermobarometry Brazilian Journal of Geology Pernambuco-Alagoas Domain calc-alkaline orogenic granites crystallization conditions magmatic epidote high ascension rates |
| title | Rapid magma ascent and formation of the Águas Belas-Canindé granitic batholith, NE Brazil: evidence of epidote dissolution and thermobarometry |
| title_full | Rapid magma ascent and formation of the Águas Belas-Canindé granitic batholith, NE Brazil: evidence of epidote dissolution and thermobarometry |
| title_fullStr | Rapid magma ascent and formation of the Águas Belas-Canindé granitic batholith, NE Brazil: evidence of epidote dissolution and thermobarometry |
| title_full_unstemmed | Rapid magma ascent and formation of the Águas Belas-Canindé granitic batholith, NE Brazil: evidence of epidote dissolution and thermobarometry |
| title_short | Rapid magma ascent and formation of the Águas Belas-Canindé granitic batholith, NE Brazil: evidence of epidote dissolution and thermobarometry |
| title_sort | rapid magma ascent and formation of the aguas belas caninde granitic batholith ne brazil evidence of epidote dissolution and thermobarometry |
| topic | Pernambuco-Alagoas Domain calc-alkaline orogenic granites crystallization conditions magmatic epidote high ascension rates |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892020000200611&tlng=en |
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