The Lages diatremes: mineral composition and petrological implications

Autor: Giancarlo Barabino, Celso B. Gomes, Gianbosco Traversa

Publikováno v: Anais da Academia Brasileira de Ciências, Vol 79, Iss 3, Pp 473-501 (2007)

Chemical data of heavy minerals from Lages diatremes in southern Brazil have been studied with the aim of characterizing the sample source(s). Three groups of minerals are recognized: I) aluminian-chromian pyroxene, pyrope garnet and chromian spinel,

Externí odkaz: https://doaj.org/article/305ca72707d54d358bbafce226743381

Petrography and mineral chemistry of carbonatites and mica-rich rocks from the Araxá complex (Alto Paranaíba Province, Brazil)

Autor: GIANBOSCO TRAVERSA, CELSO B. GOMES, PIERO BROTZU, NICOLETTA BURAGLINI, LUCIO MORBIDELLI, MARIA SPERANZA PRINCIPATO, SARA RONCA, EXCELSO RUBERTI

Publikováno v: Anais da Academia Brasileira de Ciências, Vol 73, Iss 1, Pp 71-98 (2001)

The Araxá complex (16 km²) comprises carbonatites forming a central core and a complex network of concentric and radial dykes as well as small veins; additionally, it includes mica-rich rocks, phoscorites and lamprophyres. Fenites also occur and ar

Externí odkaz: https://doaj.org/article/c52abad4ce2e4e03a88dc2b6dd83f6f6

Morphological aspects, textural features and chemical composition of spherules from the Colônia impact crater, São Paulo, Brazil

Autor: Leonardo Augusto Moraes, Marcos de Souza Mansueto, José Maria Azevedo Sobrinho, Alethéa Ernandes Martins Sallun, William Sallun Filho, Celso B. Gomes, Victor Fernandez Velázquez, Rodrigo F. Lucena

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Solid Earth Sciences, Vol 6, Iss 1, Pp 27-36 (2021)

A wide variety of spherules and aluminum-silicate accretionary particles are found associated to allochthonous breccia deposits within the Colonia impact crater, SE Brazil. Using morphological, textural and compositional variation parameters, four ty

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::efeec9c26014bfdce3a9332a49623301

Isotopic clues tracking the open-system evolution of the Ponte Nova mafic-ultramafic alkaline massif, SE Brazil: The contribution of Pb isotopes

Autor: Adriana Alves, Vincenza Guarino, Celso B. Gomes, Rogério Guitarrari Azzone, Luanna Chmyz, Excelso Ruberti

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

The Pb isotope ratios of olivine- and nepheline-normative rocks from the Ponte Nova mafic-ultramafic alkaline massif (SE Brazil) corroborate evidence that the assimilation of crustal components played an important role in this small magma chamber. Ne

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::93084bafac434577cf4b807a113035ce
http://hdl.handle.net/11588/857645

Relações de contato entre rochas alcalinas máficas e sieníticas na Praia do Jabaquara, setor norte da Ilha de São Sebastião, SP

Autor: Excelso Ruberti, Saulo Vieira da Silva Filho, Gaston Eduardo Enrich Rojas, Rogério Guitarrari Azzone, Marco Timich, Celso B. Gomes

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Geologia USP. Série Científica, Vol 19, Iss 4 (2019)

Relações de contato entre as rochas sieníticas do stock de Serraria e as rochas máficas plutônicas e hipoabissais do setor norte da suíte alcalina da Ilha de São Sebastião (Ilhabela) são descritas pela primeira vez, permitindo a indicação

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6ada57b79ee04d7662ef6693f3775095