Geochemistry and Geochronology (U-Pb and Lu-Hf) of the Soarinho Alkaline Massif (Brazil): Implications on Mantle versus Crustal Signature of Syenitic Magma
The Soarinho Alkaline Intrusion, southeastern Brazil, makes up part of the Serra do Mar Igneous Province, and it is composed of alkali feldspar syenite, alkali feldspar trachyte, quartz syenite, and monzonite. Geochemical and geochronological analyses of the Soarinho were compared with data from its...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-07-01
|
| Series: | Minerals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-163X/13/7/904 |
| _version_ | 1797588117557870592 |
|---|---|
| author | Daniel Adelino da Silva Guilherme Loriato Potratz Mauro Cesar Geraldes |
| author_facet | Daniel Adelino da Silva Guilherme Loriato Potratz Mauro Cesar Geraldes |
| author_sort | Daniel Adelino da Silva |
| collection | DOAJ |
| description | The Soarinho Alkaline Intrusion, southeastern Brazil, makes up part of the Serra do Mar Igneous Province, and it is composed of alkali feldspar syenite, alkali feldspar trachyte, quartz syenite, and monzonite. Geochemical and geochronological analyses of the Soarinho were compared with data from its neighbors, Rio Bonito and Tanguá. Zircon U-Pb Laser Ablation ages show that Soarinho is younger than Rio Bonito and Tanguá. Ages obtained from the monzonite (60 ± 2 Ma), alkali feldspar syenite (58 ± 2 Ma), and quartz syenite (58 ± 2 Ma) are indistinguishable within error. One nepheline syenite sample from Tanguá gives an age equal to those of Rio Bonito already published (65 ± 1 Ma). Petrographic and geochemical data show a clear contrast among Soarinho, Rio Bonito, and Tanguá. Lu-Hf isotopic data for the three alkaline intrusions (all negative) point to some similarities in their sources. The data suggest an enriched mantle source for Soarinho; however, an older continental crust contribution cannot be discarded. |
| first_indexed | 2024-03-11T00:48:16Z |
| format | Article |
| id | doaj.art-c57dd10352294a3c9ce978643345e9ae |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-11T00:48:16Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-c57dd10352294a3c9ce978643345e9ae2023-11-18T20:38:39ZengMDPI AGMinerals2075-163X2023-07-0113790410.3390/min13070904Geochemistry and Geochronology (U-Pb and Lu-Hf) of the Soarinho Alkaline Massif (Brazil): Implications on Mantle versus Crustal Signature of Syenitic MagmaDaniel Adelino da Silva0Guilherme Loriato Potratz1Mauro Cesar Geraldes2Programa de Pós-Graduação em Geociências, Faculdade de Geologia, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524, Maracanã, Rio de Janeiro 20950-000, RJ, BrazilPrograma de Pós-Graduação em Geociências, Faculdade de Geologia, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524, Maracanã, Rio de Janeiro 20950-000, RJ, BrazilFaculdade de Geologia, Universidade do Estado do Rio de Janeiro, Av. São Francisco Xavier, 524, Sala 2020A, Maracanã, Rio de Janeiro 20950-000, RJ, BrazilThe Soarinho Alkaline Intrusion, southeastern Brazil, makes up part of the Serra do Mar Igneous Province, and it is composed of alkali feldspar syenite, alkali feldspar trachyte, quartz syenite, and monzonite. Geochemical and geochronological analyses of the Soarinho were compared with data from its neighbors, Rio Bonito and Tanguá. Zircon U-Pb Laser Ablation ages show that Soarinho is younger than Rio Bonito and Tanguá. Ages obtained from the monzonite (60 ± 2 Ma), alkali feldspar syenite (58 ± 2 Ma), and quartz syenite (58 ± 2 Ma) are indistinguishable within error. One nepheline syenite sample from Tanguá gives an age equal to those of Rio Bonito already published (65 ± 1 Ma). Petrographic and geochemical data show a clear contrast among Soarinho, Rio Bonito, and Tanguá. Lu-Hf isotopic data for the three alkaline intrusions (all negative) point to some similarities in their sources. The data suggest an enriched mantle source for Soarinho; however, an older continental crust contribution cannot be discarded.https://www.mdpi.com/2075-163X/13/7/904syenitic magma sourcealkali feldspar syenitequartz syeniteU-Pb datingLu-Hf isotopesSoarinho alkaline massif |
| spellingShingle | Daniel Adelino da Silva Guilherme Loriato Potratz Mauro Cesar Geraldes Geochemistry and Geochronology (U-Pb and Lu-Hf) of the Soarinho Alkaline Massif (Brazil): Implications on Mantle versus Crustal Signature of Syenitic Magma Minerals syenitic magma source alkali feldspar syenite quartz syenite U-Pb dating Lu-Hf isotopes Soarinho alkaline massif |
| title | Geochemistry and Geochronology (U-Pb and Lu-Hf) of the Soarinho Alkaline Massif (Brazil): Implications on Mantle versus Crustal Signature of Syenitic Magma |
| title_full | Geochemistry and Geochronology (U-Pb and Lu-Hf) of the Soarinho Alkaline Massif (Brazil): Implications on Mantle versus Crustal Signature of Syenitic Magma |
| title_fullStr | Geochemistry and Geochronology (U-Pb and Lu-Hf) of the Soarinho Alkaline Massif (Brazil): Implications on Mantle versus Crustal Signature of Syenitic Magma |
| title_full_unstemmed | Geochemistry and Geochronology (U-Pb and Lu-Hf) of the Soarinho Alkaline Massif (Brazil): Implications on Mantle versus Crustal Signature of Syenitic Magma |
| title_short | Geochemistry and Geochronology (U-Pb and Lu-Hf) of the Soarinho Alkaline Massif (Brazil): Implications on Mantle versus Crustal Signature of Syenitic Magma |
| title_sort | geochemistry and geochronology u pb and lu hf of the soarinho alkaline massif brazil implications on mantle versus crustal signature of syenitic magma |
| topic | syenitic magma source alkali feldspar syenite quartz syenite U-Pb dating Lu-Hf isotopes Soarinho alkaline massif |
| url | https://www.mdpi.com/2075-163X/13/7/904 |
| work_keys_str_mv | AT danieladelinodasilva geochemistryandgeochronologyupbandluhfofthesoarinhoalkalinemassifbrazilimplicationsonmantleversuscrustalsignatureofsyeniticmagma AT guilhermeloriatopotratz geochemistryandgeochronologyupbandluhfofthesoarinhoalkalinemassifbrazilimplicationsonmantleversuscrustalsignatureofsyeniticmagma AT maurocesargeraldes geochemistryandgeochronologyupbandluhfofthesoarinhoalkalinemassifbrazilimplicationsonmantleversuscrustalsignatureofsyeniticmagma |