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Mostrando ítems 11-20 de 136
SHRIMP chronology of the Magallanes Basin basement, Tierra del Fuego: Cambrian plutonism and Permian high-grade metamorphism
(Servicio Nacional de Geología y Minería (SERNAGEOMIN), 2010)
The Early Paleozoic history of the Cuyania (greater Precordillera) terrane of western Argentina: evidence from geochronology of detrital zircons from Middle Cambrian sandstones
(Universidad de Barcelona, 2005-01)
U-Pb geochronology of large detrital zircons populations is a powerful tool for interpreting sandstone provenance. Here, it is applied to three Middle Cambrian sandstones from the Precordillera of Argentina with the purpose ...
Late Cambrian – Tremadocian faunas and events from Angosto del Moreno Section, Eastern Cordillera, Argentina
(Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Instituto Superior de Correlación Geológica, 2003)
The Santa Victoria Group (SVG, late Upper Cambrian – Caradocian) comprises pre–Ashgillian Ordovician deposits of the Argentinean Eastern Cordillera. The most significant section of the SVG in the western flank of the Eastern ...
Global or regional? Constraining the origins of the middle Bambuí carbon cycle anomaly in Brazil
(2020-09-15)
The Ediacaran-Cambrian Bambuí Group in Brazil records an anomalously positive excursion in carbonate carbon isotopes (δ13Ccarb) with a sustained plateau of ca. +15‰ (aka the Middle Bambuí Excursion–MIBE). Considering that ...
Sedimentology and sequence stratigraphy from a mixed (carbonate-siliciclastic) rift to passive margin transition: The early to middle cambrian of the argentine precordillera
(Elsevier Science, 2015-03)
Through the analysis of facies stacking patterns, geometries and bounding surfaces, sequence stratigraphy provides a framework to understand sedimentary facies distribution and evolution. Many published works contain ...
Cambrian, Ordovician and Silurian non-stromatoporoid Porifera
(Lyell collection, 2013-07)
The Cambrian, Ordovician and Silurian distributions of non-stromatoporoid sponges are reviewed. The earliest Cambrian faunas contain mostly hexactinellids, with protomonaxonids dominating middle Cambrian assemblages. There ...
Paleogeographic and tectonic evolution of the Pampia Terrane in the Cambrian: New paleomagnetic constraints
(Elsevier Science, 2020-03)
Paleomagnetic, magnetic fabric and rock magnetic studies were carried out in the late Middle to early Late Cambrian Campanario Formation exposed in NW Argentina. The study also presents preliminary results from the Early ...
New conodont records of the Los Sombreros Formation (Cambrian-Ordovician) from the Western Precordillera, Argentina: Biostratigraphic and palaeoenvironmental implications
(Cambridge University Press, 2019-09)
The presence of a carbonate platform that interfingers towards the west with slope facies allows for the identification of an ancient lower Palaeozoic continental margin in the Western Precordillera of Argentina. The Los ...