Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Valmir da Silva Souza"'
Autor:
Raquel Guimarães da Silva, Valmir da Silva Souza, Guilherme de Oliveira Gonçalves, Luiza dos Santos Ferreira, Paulo Sérgio Mendes dos Santos Júnior
Publikováno v:
Brazilian Journal of Geology, Vol 54, Iss 1 (2024)
Abstract The Cachoeirinha Sn ± (Nb-Ta) deposit is an important producer of the Rondônia Tin Province. It is inserted in the regional unit named Rondônia Intrusive Suite (995–956 Ma) and hosts granular accumulations of columbite group minerals (C
Externí odkaz:
https://doaj.org/article/574ff7c52c0c4d60bbedd5081e154c2d
Publikováno v:
REM: International Engineering Journal, Vol 73, Iss 3, Pp 319-327 (2020)
Abstract Beryl is usually found in granite-pegmatite systems. The addition of chromophore elements (V, Cr, Mn, Fe) into the crystalline structure favors color changes in beryl and thus generates some of the world’s expensive gems such as emerald, m
Externí odkaz:
https://doaj.org/article/f015f0d458564d1da3b780a095a82e9b
Autor:
Alanna Cristina Vieira Rodrigues da Silva, Valmir da Silva Souza, Massimo Matteini, Nilson Francisquini Botelho
Publikováno v:
Geologia USP. Série Científica, Vol 20, Iss 2 (2020)
O Granito Itapuranga localiza-se na porção central da Faixa Brasília, exibe formato alongado na direção E-W e está associado ao Lineamento dos Pirineus. Apresenta textura porfirítica em diferentes estágios deformacionais (protomilonito a ultr
Externí odkaz:
https://doaj.org/article/fb722b49dea1479ab7b81094d967177f
Autor:
Judiron Santos Santiago, Valmir da Silva Souza, Elton Luiz Dantas, Claudinei Gouveia de Oliveira
Publikováno v:
Brazilian Journal of Geology, Vol 49, Iss 4 (2020)
Abstract The Fazenda Bonfim emerald deposit lies within the Seridó Belt. It is a classic example of deposit formed through metasomatic interactions between Be-rich granite intrusions and Cr(± V)-rich mafic-ultramafic rocks. The setting of the emera
Externí odkaz:
https://doaj.org/article/dfffd6a76d56414e8a1937827c8d2d87
Autor:
Judiron Santos Santiago, Valmir da Silva Souza, Bernardo de Carvalho Filgueiras, Federico Alberto Cuadros Jiménez
Publikováno v:
Brazilian Journal of Geology, Vol 48, Iss 3, Pp 457-472 (2018)
ABSTRACT: The Fazenda Bonfim emerald deposit, State of Rio Grande do Norte, is within the regional geological domain known as Seridó Mobile Belt, Borborema Tectonic Province. It was formed from metasomatic fluids interaction at along lithological co
Externí odkaz:
https://doaj.org/article/54e1efac3fe442b996997230e5c21f3c
Publikováno v:
Revista Brasileira de Geomorfologia, Vol 16, Iss 4 (2018)
O principal objetivo desse estudo foi caracterizar as feições morfoesculturais e morfoestruturais correlacionando-as com as unidades geológicas, ao longo das rodovias estaduais AM-010 e AM-363, abrangendo os municípios de Itacoatiara, Silves e It
Externí odkaz:
https://doaj.org/article/467291f5730e4a03851cd7e11f91db07
Autor:
Valmir da Silva Souza, Antônio Gilmar Honorato de Souza, Elton Luiz Dantas, Cristóvão da Silva Valério
Publikováno v:
Brazilian Journal of Geology, Vol 45, Iss 2, Pp 293-306
The Mesoproterozoic K'Mudku event (1490 - 1147 Ma) is represented by a britlle-ductile shear belt that cuts across the Paleoproterozoic units in the southernmost Guyana shield, central-north Amazon craton. This event produced mylonitization and catac
Externí odkaz:
https://doaj.org/article/34cbc4036e76474eabd1260d7d76daf6
Autor:
Cristóvão da Silva Valério, Moacir José Buenano Macambira, Valmir da Silva Souza, Elton Luiz Dantas
Publikováno v:
Brazilian Journal of Geology, Vol 47, Iss 3, Pp 441-446
ABSTRACT: This paper approaches the record of SiO2-saturated potassic alkaline magmatism of Castanhal Quartz Monzonite, Mapuera Suite, and Ladeira da Vovó Quartz Syenite. These samples are located near the Northern border of the Amazon Basin. Such r
Externí odkaz:
https://doaj.org/article/d7d3811cb8284e39ba37b3af4002cdbd
Publikováno v:
Brazilian Journal of Geology, Vol 47, Iss 4, Pp 591-613
ABSTRACT: The Igarapé Manteiga W-Sn deposit is formed by a granite stock that intrudes in the Paleoproterozoic basement. The mineralization is encapsulated in an alumino-siliceous hydrothermal carapace formed by greisen, vein-veinlets and breccia, d
Externí odkaz:
https://doaj.org/article/107b152663224cceaafd218c7a015f40
