Subvolcanic petrology of the Pico dos Três Estados region (SE Brazil): Implications for Alkaline Magmatic Evolution
Abstract This paper presents a geological study of the subvolcanic bodies present in the Pico dos Três Estados (São Paulo (SP), Rio de Janeiro (RJ), and Minas Gerais (MG)) and its surroundings at the Passa Quatro Alkaline Complex. In this study, we used field-collected data, petrography, and geochem...
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Sociedade Brasileira de Geologia
2025-02-01
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| Series: | Brazilian Journal of Geology |
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| author | Graciano Carlos de Freitas Artur Corval Júlio Cesar Lopes da Silva Helena Saraiva Koenow Pinheiro Sérgio de Castro Valente |
| author_facet | Graciano Carlos de Freitas Artur Corval Júlio Cesar Lopes da Silva Helena Saraiva Koenow Pinheiro Sérgio de Castro Valente |
| author_sort | Graciano Carlos de Freitas |
| collection | DOAJ |
| description | Abstract This paper presents a geological study of the subvolcanic bodies present in the Pico dos Três Estados (São Paulo (SP), Rio de Janeiro (RJ), and Minas Gerais (MG)) and its surroundings at the Passa Quatro Alkaline Complex. In this study, we used field-collected data, petrography, and geochemical analysis data. From a more detailed fieldwork, we verified that the region that appeared to present only two lithologies in previous works presented a faciological complex with at least six distinct facies, with emphasis on the phonolitic body that forms the Pico dos Três Estados (2,665 m high). Still regarding fieldwork, we found that there are signs of magma mingling processes in the area. Modeling indicates that 10% of fractional crystallization was able to derive the phonolitic rocks from a trachytic liquid based on the following elements: Y, Nb, Yb, Ce, Sm, Eu, La, Nd, Hf, and Pr. The modal batch partial melting shows the possible mantle sources for the magmatism in this area. This data pointed out the involvement of an enriched mantle source in the La/Yb ratio by at least 16 times more than an Oceanic Island Basalt (OIB)-type mantle. |
| format | Article |
| id | doaj-art-74f177ba83fa4071abef43248a56f902 |
| institution | Kabale University |
| issn | 2317-4692 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Sociedade Brasileira de Geologia |
| record_format | Article |
| series | Brazilian Journal of Geology |
| spelling | doaj-art-74f177ba83fa4071abef43248a56f9022025-02-04T07:40:07ZengSociedade Brasileira de GeologiaBrazilian Journal of Geology2317-46922025-02-015510.1590/2317-4889202520240009Subvolcanic petrology of the Pico dos Três Estados region (SE Brazil): Implications for Alkaline Magmatic EvolutionGraciano Carlos de Freitashttps://orcid.org/0000-0001-5796-7632Artur Corvalhttps://orcid.org/0000-0002-5154-2737Júlio Cesar Lopes da Silvahttps://orcid.org/0000-0001-6230-0058Helena Saraiva Koenow Pinheirohttps://orcid.org/0000-0001-5742-7556Sérgio de Castro Valentehttps://orcid.org/0000-0002-7467-672XAbstract This paper presents a geological study of the subvolcanic bodies present in the Pico dos Três Estados (São Paulo (SP), Rio de Janeiro (RJ), and Minas Gerais (MG)) and its surroundings at the Passa Quatro Alkaline Complex. In this study, we used field-collected data, petrography, and geochemical analysis data. From a more detailed fieldwork, we verified that the region that appeared to present only two lithologies in previous works presented a faciological complex with at least six distinct facies, with emphasis on the phonolitic body that forms the Pico dos Três Estados (2,665 m high). Still regarding fieldwork, we found that there are signs of magma mingling processes in the area. Modeling indicates that 10% of fractional crystallization was able to derive the phonolitic rocks from a trachytic liquid based on the following elements: Y, Nb, Yb, Ce, Sm, Eu, La, Nd, Hf, and Pr. The modal batch partial melting shows the possible mantle sources for the magmatism in this area. This data pointed out the involvement of an enriched mantle source in the La/Yb ratio by at least 16 times more than an Oceanic Island Basalt (OIB)-type mantle.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892025000100300&lng=en&tlng=enfractional crystallizationpartial meltingmagma minglingsubvolcanic rocks |
| spellingShingle | Graciano Carlos de Freitas Artur Corval Júlio Cesar Lopes da Silva Helena Saraiva Koenow Pinheiro Sérgio de Castro Valente Subvolcanic petrology of the Pico dos Três Estados region (SE Brazil): Implications for Alkaline Magmatic Evolution Brazilian Journal of Geology fractional crystallization partial melting magma mingling subvolcanic rocks |
| title | Subvolcanic petrology of the Pico dos Três Estados region (SE Brazil): Implications for Alkaline Magmatic Evolution |
| title_full | Subvolcanic petrology of the Pico dos Três Estados region (SE Brazil): Implications for Alkaline Magmatic Evolution |
| title_fullStr | Subvolcanic petrology of the Pico dos Três Estados region (SE Brazil): Implications for Alkaline Magmatic Evolution |
| title_full_unstemmed | Subvolcanic petrology of the Pico dos Três Estados region (SE Brazil): Implications for Alkaline Magmatic Evolution |
| title_short | Subvolcanic petrology of the Pico dos Três Estados region (SE Brazil): Implications for Alkaline Magmatic Evolution |
| title_sort | subvolcanic petrology of the pico dos tres estados region se brazil implications for alkaline magmatic evolution |
| topic | fractional crystallization partial melting magma mingling subvolcanic rocks |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892025000100300&lng=en&tlng=en |
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