Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Bernhard Bühn"'
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
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:
Polar Science. 18:39-47
Schirmacher Oasis, central Dronning Maud Land, East Antarctica, a dispersed fragment of the 660-610 Ma East African Orogen (EAO), exposes platformal-facies high-grade metasedimentary rocks. Here we constrain the depositional age of these sedimentary
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::28e8dd4899f84abe5e9fba1469cbae24
https://doi.org/10.1016/j.polar.2018.07.004
https://doi.org/10.1016/j.polar.2018.07.004
Autor:
Coraline Heinis Dias, Luiz A.D. Menezes Filho, Mario Luiz de Sá Carneiro Chaves, Bernhard Bühn
Publikováno v:
Geosciences = Geociências. 37:225-236
portuguesAs idades iniciais de sedimentacao/vulcanismo do Supergrupo Espinhaco (Minas Gerais e Bahia) sao razoavelmente bem estabelecidas (~1.700Ma), bem como as idades das deformacoes relacionadas ao final do Ciclo Brasiliano (580-490Ma). Entretanto
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8055de712284c6237fa18bc7fcd86bc2
https://doi.org/10.5016/geociencias.v37i2.12182
https://doi.org/10.5016/geociencias.v37i2.12182
Publikováno v:
Mineralium Deposita. 54:347-368
Turmalina is an important orogenic gold deposit located in the NW region of the Quadrilatero Ferrifero. The deposit is hosted in an Archean greenstone belt composed of ortho-amphibolites and pelites with interleaved tuffs metamorphosed under amphibol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::43158a8b56d06cbd7aeebeaac76577ed
https://doi.org/10.1007/s00126-018-0811-7
https://doi.org/10.1007/s00126-018-0811-7
Autor:
Bernhard Bühn, Bernd Lehmann, Stefan Halder, Alexandre Raphael Cabral, Henry Francisco Galbiatti, Antônio Augusto Seabra Gomes
Publikováno v:
Journal of South American Earth Sciences. 79:377-383
In-situ laser ablation and multicollector–inductively coupled plasma–mass spectrometry were combined to analyse for sulfur isotopes in sulfide minerals that occur in the 2.7-billion-year-old black shale of Serra Sul, Carajas mineral province, Bra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c267a75556176bf56032e521c2a79575
https://doi.org/10.1016/j.jsames.2017.08.002
https://doi.org/10.1016/j.jsames.2017.08.002
Autor:
Fábio Ramos Dias de Andrade, Elton Luiz Dantas, Sebastian Viehmann, Detlef H.G. Walde, Michael Bau, Bernhard Bühn
Publikováno v:
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
The Urucum iron and manganese formation (IF and MnF) in the Neoproterozoic Santa Cruz Formation, Brazil, provides unique insights into Neoproterozoic seawater and the habitat for the evolution of the Ediacaran fauna. Pure Urucum IF drill core samples
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8582d093622a0e572b895e341d12ab60
https://doi.org/10.1016/j.precamres.2016.07.006
https://doi.org/10.1016/j.precamres.2016.07.006
Autor:
Claudinei Gouveia de Oliveira, Gustavo Campos Marques, Márcio Martins Pimentel, Frederico Bedran de Oliveira, Bernhard Bühn, E.L. Dantas, Maria Emilia Schutesky Della Giustina
Publikováno v:
Ore Geology Reviews. 72:1-21
The large Chapada Cu–Au deposit is situated in Goias Magmatic Arc, Central Brazil, which is part of an accretionary orogen with tectonic evolution between ca. 900 and 600 Ma during the Brasiliano Orogeny. With a current reserve (proven and probable
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f6355b1ff83a70a117e22becfa0b3e21
https://doi.org/10.1016/j.oregeorev.2015.06.021
https://doi.org/10.1016/j.oregeorev.2015.06.021
Autor:
Michael Bau, Bernhard Bühn, Albertus J. B. Smith, Nicolas J. Beukes, Elton Luiz Dantas, Sebastian Viehmann
Publikováno v:
Journal of African Earth Sciences. 111:322-334
Pure marine chemical sediments, such as (Banded) Iron Formations, (B)IFs, are archives of geochemical proxies for the composition of Precambrian seawater and may provide information about the ancient hydrosphere-atmosphere system. We here present rar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b4b8d6077c5cb7e7b41213e93bde3b33
https://doi.org/10.1016/j.jafrearsci.2015.08.013
https://doi.org/10.1016/j.jafrearsci.2015.08.013
Autor:
Linda Baldewein, Detlef H.G. Walde, Michael Bau, Gila Merschel, Elton Luiz Dantas, Bernhard Bühn
Publikováno v:
Comptes Rendus Geoscience. 347:284-293
Total and dissolved rare earth element (REEs) and U concentrations were determined for waters from Lake Paranoa (Brasilia, Brazil) sampled in the dry (November 2012) and wet seasons (July 2013). Shale-normalized REE patterns of all samples display th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::88fe6e13f861978fc5c3bab9c4f04125
https://doi.org/10.1016/j.crte.2015.01.004
https://doi.org/10.1016/j.crte.2015.01.004