Zobrazeno 1 - 10
of 69
pro vyhledávání: '"Celso de Barros Gomes"'
Autor:
Amanda Andrade de Souza, Rogério Guitarrari Azzone, Luanna Chmyz, Lina Maria Cetina Tarazona, Fábio Ramos Dias de Andrade, José Vinicius Martins, Excelso Ruberti, Celso de Barros Gomes
Publikováno v:
Minerals, Vol 14, Iss 7, p 724 (2024)
The formation of Fe-Ti oxides-rich layers is commonly associated with open-system magma chamber dynamics. These processes are widely discussed due to the economic importance of Fe-Ti-(V) deposits, although an alkaline-system approach to the matter is
Externí odkaz:
https://doaj.org/article/9f150241df43465b8040ac605250d25a
Publikováno v:
Brazilian Journal of Geology, Vol 53, Iss 3 (2023)
Abstract Associated with subordinate potassic rocks, Mesozoic to Cenozoic sodic alkaline rocks are represented by four distinct provinces in Eastern Paraguay: Alto Paraguay, Central, Misiones, and Asunción; additional Rio Apa and Amambay provinces a
Externí odkaz:
https://doaj.org/article/3331c82d0cb54b128fc1fbd8013d64e0
Publikováno v:
Brazilian Journal of Geology, Vol 53, Iss 2 (2023)
Abstract This study revises the early-magmatic, late-magmatic, and hydrothermal mineral assemblages occurring in rocks of agpaitic affinity, mainly represented by nepheline syenites and phonolites, from the Poços de Caldas alkaline massif. Mostly co
Externí odkaz:
https://doaj.org/article/3dc0ca1c09ae4d36b27d644e039c372c
Autor:
Marco Timich, Rogério Guitarrari Azzone, Gaston Eduardo Enrich Rojas, Saulo Vieira da Silva Filho, Excelso Ruberti, Celso de Barros Gomes
Publikováno v:
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://doaj.org/article/ee307a4b08044b208f117c2682773a9d
Autor:
Celso de Barros Gomes, Rogério Guitarrari Azzone, Gaston Eduardo Enrich Rojas, Vincenza Guarino, Excelso Ruberti
Publikováno v:
Minerals, Vol 11, Iss 9, p 934 (2021)
General information is presented on ten agpaitic occurrences located in southern Brazil and at the border between Brazil and Paraguay. All the Brazilian agpaitic rocks are Late Cretaceous in age, whereas the Paraguayan ones are older than Early Trias
Externí odkaz:
https://doaj.org/article/29c35f0928264eb2842e2ed855ef02c4
Autor:
Celso de Barros Gomes, Rogério Guitarrari Azzone, Excelso Ruberti, Paulo Marcos de Vasconcelos, Kei Sato, Gaston Eduardo Enrich Rojas
Publikováno v:
Brazilian Journal of Geology, Iss 0 (2018)
ABSTRACT: New age determinations by Ar-Ar and U-Pb SHRIMP for the alkaline complexes of Banhadão and Itapirapuã that occur in the Ribeira Valley are in agreement with the previously radiometric K-Ar ages available in literature. Ar-Ar ages on bioti
Externí odkaz:
https://doaj.org/article/7dc513bce5f94d448cfc5026d0911dcf
Autor:
Celso de Barros Gomes, Ana Maria Castillo Clerici Clerici, Victor Velázquez Fernandez, Angelo De Min, Piero Comin‑Chiaramonti
Publikováno v:
Geologia USP. Série Científica, Vol 17, Iss 2 (2017)
A Cordilheira do Ybytytyruzú na região centro‑oriental do Paraguai é formada dominantemente de derrames de lavas toleíticas de idade Cretáceo Inferior (130–134 Ma) cortados por diques alcalinos potássicos e corpos intrusivos com idades entr
Externí odkaz:
https://doaj.org/article/f3098415905d46d58cf0f8c4ceda8f08
Publikováno v:
Geologia USP. Série Científica, Vol 15, Iss 3-4 (2015)
Perovskite-group minerals of alkaline-carbonatitic rocks from the Rio Apa and Amambay regions in Eastern Paraguay are members of the perovskite-lueshite-loparite-latrappite solid-solution series. Strontian-loparite is prevailing in the fenitized trac
Externí odkaz:
https://doaj.org/article/aef2d91667b84bfdb14f7614a19d3be2
Autor:
Rogério Guitarrari Azzone, Excelso Ruberti, Gaston Eduardo Enrich Rojas, Celso de Barros Gomes
Publikováno v:
Geologia USP. Série Científica, Vol 9, Iss 2, Pp 23-46 (2009)
The Ponte Nova alkaline mafi c-ultramafi c massif lies in the northern sector of the Serra do Mar Province, close to theeastern part of the Mantiqueira mountain range, SE Brazil. The massif is exposed in two different areas separated by basementrocks
Externí odkaz:
https://doaj.org/article/fb3db3a5261b46a18c54ecfa825860cb
Publikováno v:
Geologia USP. Série Científica, Vol 9, Iss 1, Pp 1-13 (2009)
The Cananeia alkaline occurrence of Late Cretaceous age (Ar-Ar, 83.6 Ma) lies in the Ribeira Valley and it is representedby two small bodies: Morro de São João (1.8 km2) in Cananeia Island, and Morrete (0.4 km2), in the neighboringComprida Island.
Externí odkaz:
https://doaj.org/article/4c8a4eac5a934f26a34f73d68fc0826c