U-Pb zircon geochronology
Review of Survey Activities 2005: Using zircon geochronology to resolve the Archaean geology of southern West Greenland
... situ U-Pb zircon geochronology could be carried out only using ion microprobes, requiring lengthy analysis times of ...in zircon geochronology tech- niques that are much faster, ...
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ABSTRACT: Caxias is an orogenic gold deposit in the São Luís cratonic
... single-zircon Pb-evaporation age of 1985 ± 4 Ma has been determined for the Caxias Microtonalite, which hosts part of gold mineralization at Caxias (Klein et ...high-resolution U-Pb ...
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Repositório Institucional da UFPA: Geology, Geochemistry, and Geochronology (U-Pb) of the Rio Fortuna Gneiss - Serra do Baú Intrusive Suite - Paraguá Terrane - SW Amazonian Craton
... The rocks in this unit are of a slightly expanded acidic nature, with SiO 2 values between 67.17 and 75.76%. The Harker diagrams (Fig. 5) show coherent variation trends, with negative linear correlations between silica ...
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Repositório Institucional da UFPA: Evolução geológica da porção centro-sul do Escudo Guianas com base no estudo geoquímico, geocronológico (evaporação de Pb e U-Pb ID-TIMS em zircão) e isótopo (Nd-Pb) dos granitóides paleoproterozóicos do sudeste de Rorai
... The zircon geochronology results of SUAD show that crystallization age range (and inheritances) is very similar to the calc-alkaline Parauari- (Tropas)-Iriri magmatism (1898-1879 Ma) in the Tapajos domain ...
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REPOSITORIO INSTITUCIONAL DA UFOP: U-Pb geochronology of the Lagoa Real uranium district, Brazil : implications for the age of the uranium mineralization.
... relict zircon grains from the original granitic rock), as well as minerals crystallized or reset at 956 ± 59 Ma ...mixing U and Pb extracted from minerals ...
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Tectonic evolution of the southern margin of the Amazonian craton in the late Mesoproterozoic based on field relationships and zircon U-Pb geochronology
... New U-Pb zircon geochronological data integrated with field relationships and an airborne geophysical survey suggest that the Nova Brasilândia and Aguapeí belts are part of the same monocyclic, ...
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Provenance and age delimitation of Quadrila´tero Ferrı´fero sandstones based on zircon U–Pb isotopes
... ously. Zircon age spectra from sedimentary rocks provide a record of magmatic events of an orogeny ...SHRIMP U–Pb zircon data indicate two age peaks at w2759 and w2710 Ma, so two orogenic ...
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Metamorphic evolution and U-Pb zircon SHRIMP geochronology of the Belizário ultramafic amphibolite, Encantadas Complex, southernmost Brazil
... and zircon U-Pb SHRIMP geochronology of the Belizário ultramafic amphibolite from southernmost Brazil leads to a better understanding of the processes involved in the generation of the ...
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Paleoproterozoic felsic volcanism of Iricoumé group, Erepecuru-Trombetas domain, Amazonian central province: Field and petrographic characterization and Pb-Pb zircon geochronology
... idades Pb-Pb e U-Pb SHRIMP em zircão de 1,89 – 1,88 Ga (Costi, Dall’Agnol, Moura, 2000; Santos et ...similar Pb-Pb em zir- cão de 1,89 Ga foi obtida no sudeste do estado de ...
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U-Pb SHRIMP and Sm-Nd geochronology of the Silvânia Volcanics and Jurubatuba Granite: juvenile Paleoproterozoic crust in the basement of the Neoproterozoic Brasília Belt, Goiás, central Brazil
... table. The concentrates were then passed through a Frantz isodynamic magnetic separator to obtain a pure zircon fraction. At least 100 representative zircons were hand-picked from this fraction under a binocular ...
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REPEATED PARTIAL MELTING EVENTS IN POLYMETAMORPHIC CARLOS CHAGAS BATHOLITH: IMPLICATIONS FOR TECTONO- METAMORPHIC EVOLUTION OF THE ARAÇUAÍ OROGEN, SOUTHEASTERN BRAZIL
... reconnaissance geochronology (Roncato, 2009; Pedrosa-Soares et ...identical U-Pb crystallization ages at ...combining U-Pb dating and Hf isotopic composition performed on different ...
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SHRIMP U-Pb Geochronology of the Socorro Batholith and implications for the Neoproterozoic evolution in SE Brazil
... rited zircon was identified in the two charnockite samples and a single one was found in one of the Bragança-Paulista type granites ...of U-Pb zircon ages dated by TIMS after chemical ...
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U-Pb Geochronology Zircon (LA-ICP-MS) data of the Gneissic-Migmatitic Complex of Salvador-Esplanada-Boquim Belt, São Francisco Craton, Brazil/Geocronologia U-Pb (LA-ICP-MS) em zircões do Complexo Gnáissico-Migmatítico do Cinturão Salvador-Esplanada-Boquim, Cráton do São Francisco, Brasil
... the U-Pb method (Laser Ablation-ICP-MS) in zircons and the study area comprises the state of Sergipe southern portion and the state of Bahia northeastern ...
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Braz. J. Geol. vol.47 número2
... U-Pb zircon analyses were performed on ive samples by laser inductively-coupled plasma mass spectrometry (LA-ICP-MS) at the Geochronology Laboratory of University of Brasília ...he ...
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Brazilian Journal of Geology
... U-Pb zircon analyses were performed on five samples by laser inductively-coupled plasma mass spectrometry (LA-ICP-MS) at the Geochronology Laboratory of University of Brasília ...The ...
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AGE OF THE RIBEIRÃO DA FOLHA OPHIOLITE, ARAÇUAÍ OROGEN: THE U-Pb ZIRCON (LA-ICPMS) DATING OF A PLAGIOGRANITE
... studies have been carried out on metamagmatic and metasedimentary rocks from this and other ophiolite slivers of the Araçuaí Orogen (e.g., Pedrosa-Soares et al. 1998, 2001, Aracema et al. 2000, Suita et al. 2004, ...
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This article is licensed under a Creative Commons Attribution-NonCommercial 4.0 International
... report U-Pb SHRIMP age determinations and Sm-Nd isotopic studies of these rock units in order to understand their nature, timing of crystallization and mantle extraction aim- ing their tectonic significance ...
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U –Pb ages of shocked zircon grains link distal K–Pg boundary sites in Spain and Italy with the Chicxulub impact
... Ma zircon ages at Chicxulub and in K–Pg ejecta, there is evidence of lithological heterogeneity in the target ...single zircon ages in K–Pg ejecta and Chicxulub ...shocked zircon from the Raton ...
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Uranium-lead dating method at the Pará-Iso isotope geology laboratory, UFPA, Belém – Brazil
... The first step of statistical data reduction is carried out using the custom made laboratory software named “Fin- res2” and developed by Thomas Scheller. This program calculates the measured isotope ratios and their 2 ...
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Protolith age of Santa Maria Chico granulites dated on zircons from an associated amphibolite-facies granodiorite in southernmost Brazil
... of zircon SHRIMP U-Pb ages was obtained by Hartmann et ...Archean zircon U-Pb ion microprobe age ...magmatic zircon during a granulite facies growth ...
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