Zobrazeno 1 - 10
of 99
pro vyhledávání: '"Excelso Ruberti"'
Publikováno v:
Brazilian Journal of Geology, Vol 50, Iss 1 (2020)
Abstract Oxygen fugacity (ƒO2) conditions were established for Três Ranchos IV (TR-IV, diamond-bearing) and Limeira I (LM-I, barren) kimberlite intrusions, in Alto Paranaíba Alkaline Province, to constrain a possible correlation between fO2 and di
Externí odkaz:
https://doaj.org/article/c9b92f7c91d54111a0ca83b953196675
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
Publikováno v:
Brazilian Journal of Geology, Iss 0 (2018)
ABSTRACT: The Itatiaia Alkaline Massif comprises some of the largest meso-cenozoic alkaline igneous occurrences in Brazil, covering over 215 km2 between the states of Minas Gerais and Rio de Janeiro. It appears as an elongated, 30-km long and 4.5-11.
Externí odkaz:
https://doaj.org/article/f5d1dcd8f7564326bb6ef979d30d91e7
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
Publikováno v:
Geologia USP. Série Científica, Vol 10, Iss 2, Pp 23-43 (2010)
The compositional evolution of the phyllosilicates in the lateritic profile of the Catalão I ultramafic alkaline-carbonatiticcomplex (GO) is proposed in this work based on petrographic and X-ray diffraction analysis, as well as, chemical composition
Externí odkaz:
https://doaj.org/article/3e602e5dd7d94c51a882fa15c27472db
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
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
Publikováno v:
Geologia USP. Série Científica, Vol 10, Iss 2 (2010)
A evolução composicional dos filossilicatos no perfil laterítico do complexo ultramáfico alcalino-carbonatítico de Catalão I (GO) é proposta neste trabalho por meio de estudos petrográficos, de difratometria de raios X e química mineral (WDS
Externí odkaz:
https://doaj.org/article/779e22f32f554ff9b7d6c2892d9abcf6
Autor:
Rogério Guitarrari Azzone, Excelso Ruberti, Gaston Eduardo Enrich Rojas, Celso de Barros Gomes
Publikováno v:
Geologia USP. Série Científica, Vol 9, Iss 2 (2009)
O maciço alcalino máfico-ultramáfico Ponte Nova, localizado no setor norte da Província Serra do Mar, junto à porção oriental da Serra da Mantiqueira, na região Sudeste do Brasil, encontra-se encaixado em granitoides e gnaisses migmatíticos
Externí odkaz:
https://doaj.org/article/c52008e817ea4da993a20b052e699fa0
Autor:
Celso de Barros Gomes, Francisco Rubens Alves, Rogério Guitarrari Azzone, Gaston Eduardo Enrich Rojas, Excelso Ruberti
Publikováno v:
Brazilian Journal of Geology, Vol 47, Iss 1, Pp 127-145
ABSTRACT: The Late Cretaceous Búzios Island alkaline massif intrudes Precambrian charnockites and consists dominantly of syenitic rocks that are cut by a large number of dikes, mostly NE-trending, and representing two distinct suites, a felsic one a
Externí odkaz:
https://doaj.org/article/90a7817e99cd421098500f74dab19904