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Mostrando ítems 11-20 de 410
U–Pb ages of detrital zircon grains for the Canastra Group and Passos Nappe units and U–Pb and Lu–Hf isotope analyses from orthogneisses: Provenance and tectonic implications, southern Brasília Belt, Brazil
(2020-08-15)
The age and tectonic setting of Mesoproterozoic to Neoproterozoic covers that occur along the southwestern margins of the São Francisco Craton (SFC) are still uncertain. This study reports new 207Pb/206Pb LA-ICPMS ages of ...
Linkages between the southern Patagonia Pre-Permian basements: new insights from detrital zircons U-Pb SHRIMP ages from the Cerro Negro District
(Universidad de Barcelona, 2014-06)
The Patagonian basement rocks are dominated by Precambrian to Early Paleozoic metamorphic rocks intruded by Paleozoic granitoids. Recently discovered basement rocks in the Cerro Negro District are characterized ...
U-Pb detrital zircon ages of the upper metasedimentary sequences in the region of the Guarinos Greenstone Belt, Goiás, BrazilIdades U-Pb de zircão detrítico da sequência metassedimentar superior na região do Greenstone Belt de Guarinos, Goiás
(Universidade de São Paulo, Instituto de Geociências, 2017)
Eocene volcanism in the Fuegian Andes: Evidence from petrography and detrital zircons in marine volcaniclastic sandstones
(Pergamon-Elsevier Science Ltd, 2020-12)
The sedimentology, petrography, and U–Pb dating of two Eocene volcaniclastic horizons of the Punta Torcida and Leticia formations, Austral basin, Tierra del Fuego, Argentina are interpreted and documented. The volcaniclastic ...
Provenance of metasedimentary rocks of the Araxá group in the central Brasília beltProveniência das rochas metassedimentares do grupo Araxá na porção central da faixa Brasília
(2019-01-01)
The Araxá Group in the region of Morrinhos – Marcelândia is constituted of pelitic to psammo-pelitic rocks metamorphosed in amphibolite facies, kyanite/ staurolite stability field. Chemical composition and La/Lu, La/Sc, ...
Petrography and detrital zircon U-Pb geochronology of sedimentary rocks of the Campo Alegre Basin, Southern Brazil: implications for Gondwana assembly
(Sociedade Brasileira de Geologia, 2019)
Provenance variations in the Late Paleozoic accretionary complex of central Chile as indicated by detrital zircons
(Elsevier, 2013)
We present detrital zircon U\Pb SHRIMP age patterns for the central segment (34–42°S) of an extensive accretionary
complex along coastal Chile together with ages for some relevant igneous rocks. The complex consists
of ...
Eocene volcanism in the Fuegian Andes: Evidence from petrography and detrital zircons in marine volcaniclastic sandstones
(Elsevier, 2020)
The sedimentology, petrography, and U-Pb dating of two Eocene volcaniclastic horizons of the Punta Torcida and Leticia formations, Austral basin, Tierra del Fuego, Argentina are interpreted and documented. The volcaniclastic ...
U–Pb ages and Hf-isotope data of detrital zircons from the late Neoarchean-Paleoproterozoic Minas Basin, SE Brazil
(Elsevier Science, 2017-02)
Because of its world-class iron ore deposits and promising Au and U mineralizations, the late Neoarchean to Paleoproterozoic Minas Basin (Minas Supergroup, SE of Brazil) is one of the best-studied basins in South America. ...