Dating minerals by ID-TIMS geochronology at times of in situ analysis: selected case studies from the CPGeo-IGc-USP laboratory [PDF]
Anais da Academia Brasileira de Ciências, 2009 Since 1964, the Center for Geochronological Research - CPGeo, one of the interdepartmental centers of the Instituto de Geociências (IG) of São Paulo University, has developed studies related to several geological processes associated with different rock ...
Cláudia R. Passarelli +5 more
doaj +4 more sources
High spatial resolution analysis of Pb and U isotopes for geochronology by laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) [PDF]
Anais da Academia Brasileira de Ciências, 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.
Bernhard Bühn +3 more
doaj +4 more sources
The tectonic evolution of the Neoproterozoic Brasília Belt, central Brazil: a geochronological and isotopic approach [PDF]
Brazilian Journal of Geology, 2016 : The Brasília Belt is one of the most complete Neoproterozoic orogens in western Gondwana. Rapid progress on the understanding of the tectonic evolution of the belt was achieved due to new U-Pb data, combined with Sm-Nd and Lu-Hf analyses. The evolution
Márcio Martins Pimentel
doaj +5 more sources
Combined U-Pb and Lu-Hf isotope analyses by laser ablation MC-ICP-MS: methodology and applications [PDF]
Anais da Academia Brasileira de Ciências, 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 magma ...
Massimo Matteini +3 more
doaj +4 more sources
Tectonic evolution of the Dom Feliciano Belt in Southern Brazil: Geological relationships and U-Pb geochronology [PDF]
Brazilian Journal of Geology, 2016 : The Dom Feliciano Belt is an important Neoproterozoic to Cambrian orogenic complex, extending from eastern Uruguay to southern Brazil. It comprises a collage of oceanic domains and continental fragments developed between 900 and 540 Ma between the Rio ...
Ruy Paulo Philipp +2 more
doaj +4 more sources
The Lomagundi-Jatuli carbon isotopic event recorded in the marble of the Tandilia System basement, Río de la Plata Craton, Argentina [PDF]
, 2019 The “Lomagundi-Jatuli event” corresponds to the most important δ13C positive anomaly (≥5‰) globally reported in Palaeoproterozoic marine carbonates (between ∼2.30 and 2.06 Ga).
Ballivian Justiniano, Carlos Alberto +6 more
core +1 more source
Integração e análise de dados aerogeofísicos por meio da aplicação de técnicas de processamento digital de imagens e classificação não supervisionada : o exemplo do Greenstone Belt Rio das Velhas, quadrilátero ferrífero, MG [PDF]
, 2006 Afloramentos escassos e um intemperismo acentuado caracterizam o Greenstone Belt Rio das Velhas no sudeste do Brasil. Este artigo sumariza a utilização de dados aerogeofísicos de alta densidade de amostragem aplicados à exploração mineral baseado no ...
Moraes, Roberto Alexandre Vitória de +4 more
core +2 more sources
Revista Mexicana de Ciencias Geológicas, 2023 Los depósitos continentales del Paleógeno (Grupo Balsas) del sur de México han sido poco estudiados y se desconoce en gran medida su origen, edad, naturaleza y ambiente tectónico de formación; elementos cruciales para comprender la relación del sur de ...
Alicia Sarmiento-Villagrana +3 more
doaj +1 more source
Geoquímica e geocronologia U-Pb e Sm-Nd dos ortognaisses da região de Pontalina (GO), Brasil
Brazilian Journal of Geology, 2013 Na regiao de Pontalina (GO) afloram ortognaisses de composicao tonalitica a granodioritica e caracteriticas calcioalcalinas, metaluminosas a peraluminosas. Exibem anomalias negativas de Nb, Ta, P e Ti em relacao a elementos terras raras (ETR) e a elementos litofilos e baixos conteudos em elementos como Nb, Ta, Y e Yb, similar as rochas formadas em ...
Navarro, Guillermo Rafael Beltrano +3 more
openaire +2 more sources
Journal of Anthropology, Volume 2013, Issue 1, 2013., 2013 We present data on carbon and nitrogen isotopic composition of human bones from Tolombón (Calchaqui Valley, Salta) and Esquina de Huajra (Quebrada de Humahuaca, Jujuy) sites located in Northwest Argentina (NWA). Both are complex archaeological residential settlements ascribed to the Regional Development Period (ca.
María Soledad Gheggi +2 more
wiley +1 more source