Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Marcio M. Pimentel"'
Autor:
LUCIO M.S. FRAGA, SORAYA C. NEVES, ALEXANDRE UHLEIN, ALCIDES N. SIAL, MARCIO M. PIMENTEL, ADOLF H. HORN
Publikováno v:
Anais da Academia Brasileira de Ciências, Vol 86, Iss 2, Pp 633-648 (2014)
Neoproterozoic carbonate rocks comprise different stratigraphic units in the southern part of the Espinhaço Ridge, Minas Gerais, Brazil. C, O- and Sr-isotope analyses were carried out along four selected stratigraphic sections across these formation
Externí odkaz:
https://doaj.org/article/616a22cf4589405bbcf37434532d5f7b
Publikováno v:
Anais da Academia Brasileira de Ciências, Vol 82, Iss 2, Pp 479-491 (2010)
The Lutetium-Hafnium isotopic system represents one of the most innovative and powerful tools for geochronology and isotopic studies. Combined U-Pb and Lu-Hf in situ analyses on zircon by LA-MC-ICP-MS permit to characterize isotopically the host magm
Externí odkaz:
https://doaj.org/article/5dbe136c88374899a033e01ec9bef29c
Autor:
Silva, Maria V. Nascimento, Sial, Alcides N., Ferreira, Valderez P., Neumann, Virgínio H., Barbosa, José A., Pimentel, Marcio M. Pimentel
Publikováno v:
Repositório Institucional da Universidade Federal do Ceará (UFC)
Universidade Federal do Ceará (UFC)
instacron:UFC
Universidade Federal do Ceará (UFC)
instacron:UFC
The Paraíba Basin in northeastern Brazil contains a complete carbonate sequence that recorded theCretaceousePaleogene transition, and is composed of the Itamaracá, Gramame and Maria Farinhaformations. In this study, the behavior of C and O isotopes
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______3056::49426a8b475525e4bb6deb70108d27dd
http://www.repositorio.ufc.br/handle/riufc/60473
http://www.repositorio.ufc.br/handle/riufc/60473
Publikováno v:
Anais da Academia Brasileira de Ciências, Vol 81, Iss 1, Pp 99-114 (2009)
Age determinations using the 235U and 238U radioactive decay series to the daughter isotopes 207Pb and 206Pb, respectively, using the mineral zircon (ZrSiO4), are widely used to decipher geological processes. A new method developed in the last couple
Externí odkaz:
https://doaj.org/article/e48ae8d812284b559ec37acf694f67bb
Publikováno v:
Anais da Academia Brasileira de Ciências, Vol 77, Iss 1, Pp 137-155 (2005)
C-isotope and 87Sr/86Sr values for five carbonate successions from the São Caetano Complex, northeastern Brazil, were used to constrain their depositional age and to determine large variations in the C- and Sr-isotopic composition of seawater under
Externí odkaz:
https://doaj.org/article/444db9b4b929480c89c6209ccbe46025
Publikováno v:
Anais da Academia Brasileira de Ciências, Vol 75, Iss 3, Pp 331-339 (2003)
The Arenópolis volcano-sedimentary sequence is located in the southern part of the Goiás Magmatic Arc and includes a ca. 900 Ma calc-alkaline arc sequence made of volcanic rocks ranging in composition from basalts to rhyolites, metamorphosed under
Externí odkaz:
https://doaj.org/article/eeaecf188c5e4e4db48ef41dbef9d1e0
Publikováno v:
Anais da Academia Brasileira de Ciências, Vol 75, Iss 3, Pp 383-392 (2003)
The Fazenda Brasileiro gold mineralization is hosted by a gabbroic sill, intrusive into metavolcanicmetasedimentary rocks of the Rio Itapicuru Greenstone Belt, São Francisco Craton. The 2.05 Ga old mineralization is associated with intense shearing
Externí odkaz:
https://doaj.org/article/ad5759d962ad4f6b8707b712cc82d4ec
Publikováno v:
Anais da Academia Brasileira de Ciências, Vol 75, Iss 1, Pp 97-108 (2003)
The Itapuranga alkali granite and Uruana quartz syenite are large K-rich EW-elongated intrusions, in the central part of the Neoproterozoic Brasília Belt, central Brazil. They are associated with Pireneus lineaments, which cut the regional NNW-SSE s
Externí odkaz:
https://doaj.org/article/dd3bd8a8360e42a69bde1772dd02ee59
Autor:
MÁRCIO M. PIMENTEL, NILSON F. BOTELHO
Publikováno v:
Anais da Academia Brasileira de Ciências, Vol 73, Iss 2, Pp 263-276 (2001)
Supracrustal rocks of the Araí Group, together with coeval A-type granites represent a ca. 1.77-1.58 Ga old continental rift in Brazil. Two granite families are identified: the older (1.77 Ga) group forms small undeformed plutons, and the younger gr
Externí odkaz:
https://doaj.org/article/8139117e59664709839598e3e9667fba
Publikováno v:
Anais da Academia Brasileira de Ciências, Vol 72, Iss 4, Pp 604-605 (2000)
Externí odkaz:
https://doaj.org/article/d612af2103b64cf5b569dcf484dad1b1