Zircon U-Pb ages
Zircon ages delimit the provenance of a sand extrudite from the Botucatu Formation in the Paraná volcanic province, Iraí, Brazil
... detrital zircon crystals from a sand extrudite, Cretaceous Paraná volcanic province, set limits on the origin of the numerous sand layers present in this major flood basalt ...The zircon U-Pb ...
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Grenvillian age magmatism in the Southern Espinhaço Range (Minas Gerais): evidence from U-Pb zircon ages
... distinct ages (Brito- Neves et ...new U-Pb geochronological data suggest the superpo- sition of two continental rift basins in the Espinhaço Supergroup in its southern segment (Chemale-Junior et ...
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Geologic evolution of the Serrinha nucleus granite–greenstone terrane (NE Bahia, Brazil) constrained by U–Pb single zircon geochronology
... yielded zircon crystals that are generally of poor quality ( ...severe Pb loss, but two near-concordant data yield differ- ent ages of 3079 ± 9 Ma and 3169 ± 2 ...low U concen- tration. The ...
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Zircon U-Pb geochronology, geochemistry, Sr-Nd isotopic compositions, and tectonomagmatic implications of Nay (NE Iran) postcollisional intrusives in the Sabzevar zone
... Prior to this study, numerous geochemical and petrological investigations have been conducted on various intrusive bodies of the KKBB belt (Soltani, 2000; Malekzadeh Shafaroudi et al., 2013; Shafaii Moghadam et al., ...
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U–Pb zircon geochronology, petrochemical and Sr–Nd isotopic characteristic of Late Neoproterozoic granitoids of the Bornaward complex (Bardaskan-NE Iran)
... Results of study by Hassanzadeh (2008) demonstrate that Late Neoproterozoic to Early Cambrian granitoids and granitic gneisses are present in all continental structural zones of Iran north of the Zagros, from the ...
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GEOCHEMISTRY AND U-Pb ZIRCON AGE OF THE INTERNAL OSSA-MORENA ZONE OPHIOLITE SEQUENCES: A REMNANT OF RHEIC OCEAN IN SW IBERIA
... (2) the whole-rock geochemical data indicative of ocean- floor basalts geochemistry (plume-proximal ridge system) that lack any orogenic and/or crustal contamination signa- ture (despite the absence of isotopic data); ...
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U-Pb zircon geochronology, geochemistry, and petrogenesis of the Hamech intrusions in the Kuh-e-Shah volcano-plutonic complex, Eastern Iran
... analysis, zircon contents were examined by cathode-luminescence (CL) imaging to study internal structure after carbon coating, using a Tescan CL detector instrument at Juniata College, PA, ...LA-ICP-MS ...
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U–Pb laser ablation ICP-MS zircon dating across the Ediacaran–Cambrian transition of the Montagne Noire, southern France
... Casas, J.M., Navidad, M., Castin ˜ eiras, P., Liesa, M., Aguilar, C., Carreras, J., Hofmann, M., Ga¨rtner, A., Linnemann, U., 2015. The Late Neoprote- rozoic magmatism in the Ediacaran series of the Eastern ...
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REPOSITORIO INSTITUCIONAL DA UFOP: U–Pb ages and Hf-isotope data of detrital zircons from the late Neoarchean-Paleoproterozoic Minas Basin, SE Brazil.
... of Pb/U, background signal as well as com- mon Pb were corrected by normalizing U/Pb and Pb/Pb ratios of the unknowns to the zircon standards and Pb ...
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U-Pb zircon and monazite geochronology of Variscan magmatism related to syn-convergence extension in Central Northern Portugal
... precision U–Pb zircon and monazite ages for four plutons of the Viseu area: the syn-kinematic granitoids of Maceira (314F5 Ma), Casal Vasco (311F1 Ma) and Junqueira ...
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U-Pb ages and Nd isotope characteristics of the lateorogenic, migmatizing microcline granites in southwestern Finland
... of zircon spots to be dated was based solely on cathodoluminescence (CL) ...Al, U and common Pb concentrations, and the U-Pb anal- yses are extremely ...metamict zircon is shown ...
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Metamorphic evolution and U-Pb zircon SHRIMP geochronology of the Belizário ultramafic amphibolite, Encantadas Complex, southernmost Brazil
... The ages of the Encantadas Complex tonalites and the region- ally related Porongos supracrustal rocks were re- cently determined as Paleoproterozoic (Hartmann et ...
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3.3 Ga SHRIMP U–Pb zircon age of a felsic metavolcanic rock from the Mundo Novo greenstone belt in the São Francisco craton, Bahia (NE Brazil)
... whole-rock ages of ...isochron ages and the high initial ratios observed suggest an Archean protolith involved in the source of the sedimentary ...the ages of detrital zircons from a conglomerate ...
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Chronus : um novo suplemento para a redução de dados U-Pb obtidos por LA-MC-ICPMS
... Plesovice U-Pb ratios and ages diagrams created with ...concordant ages of Plesovice zircon ...206 Pb/ 238 U ages (green ...Plešovice U-Pb ratios and ...
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Evolução paleoproterozoica do Cinturão Mineiro: geocronologia U-Pb, isótopos de Nd-Hf-Sr...
... by U-Pb zircon provenance studies and geologic relationships with the Archean country rocks (Table ...The U-Pb detrital zircon ages range between 3250-2580 Ma, where the ...
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Geocronologia U-Pb de minerais hidrotermais : materiais de referência, métodos e aplicações.
... cointain U-bearing phases that can be used to constraint timming of fluid production and ...high-precision U-Pb geochronology method using the LA-MC-ICP-MS at Universidade Federal de Ouro Preto ...a ...
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Neoproterozoic anorogenic magmatism in the Southern Bahia Alkaline Province of NE Brazil: U–Pb and Pb–Pb ages of the blue sodalite syenites
... The sodalite syenite occurs as a 3 m wide, medium to coarse-grained pegmatite dyke cutting biotite neph- eline syenite. The sodalite content reaches 40%, and its homogeneous distribution is responsible for its com- ...
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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 zircon grains from this sample are euhedric and subeuhedric varying in size from 100 µm to 400 µm in length and presenting an approximate 2:1 ratio between length and ...the zircon growth halos is ...
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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
... 207 Pb/ 206 Pb concordia age of 949 ± 9 Ma ...the U/Pb ages for rutile are younger than the age of peak metamorphism and younger than the U/Pb ages for ...
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AGE OF THE RIBEIRÃO DA FOLHA OPHIOLITE, ARAÇUAÍ OROGEN: THE U-Pb ZIRCON (LA-ICPMS) DATING OF A PLAGIOGRANITE
... The thickest ophiolite slice, named Córrego do Rubinho ultramafic body (Fig. 1), is mainly composed of tremolite schists and carbonate-tremolite- anthophyllite schists (Pedrosa-Soares et al. 1992). Some metamafic rocks ...
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