Results 11 to 20 of about 1,303 (189)
Estudios Geologicos, 2005 Las sierras de Velasco, Copacabana y Paimán, en el ambiente de Sierras Pampeanas, están constituidas principalmente por cuerpos plutónicos del Paleozoico inferior, relacionados con el ciclo Famatiniano (Granitos Huaco, Antinaco y Paimán) y por rocas ...
J. P. López +3 more
doaj +2 more sources
Estudios Geologicos, 1992 La Formación Chango Real (sierras de Culampajá y Papachacra) es parte del magmatismo paleozoico de las Sierras Pampeanas noroccidentales (NW de la Argentina).
J. E. Lazarte
doaj +3 more sources
Journal of South American Earth Sciences, 2012 The granitic rocks of the Sierra de Ancasti represent one of the easternmost outcrops of the Famatinian arc of the Sierras Pampeanas. We report here new U–Pb SHRIMP and LA-ICP-MS Ordovician ages and a petrological and geochemical study of the Las Canadas I-type granitic complex in the central sector of Sierra de Ancasti.
Dahlquist, Juan A. +9 more
openaire +5 more sources
Proterozoico y paleozoico inferior de las Sierras Pampeanas occidentales [PDF]
, 1999 Las Sierras Pampeanas constituyen la mayor unidad ígneo-metamórfica de la Argentina; las edades de sus metamorfitas y granitoides indican que evolucionaron entre el Neoproterozoico y el Paleozoico superior; desde este último a nuestros días han sido montañas de bloque de retroarco.
Dalla Salda, Luis Hugo +3 more
openaire +2 more sources
Neoproterozoic A-type magmatism in the Western Sierras Pampeanas (Argentina): evidence for Rodinia break-up along a proto-Iapetus rift? [PDF]
, 2021 A-type orthogneisses of mid Neoproterozoic age (774 ± 6 Ma, U-Pb SHRIMP zircon age), are reported for the first time from the Grenvillian basement of the Western Sierras Pampeanas in Argentina.
Casquet, César +7 more
core +3 more sources
Geochemistry, Geophysics, Geosystems, Volume 24, Issue 10, October 2023., 2023 Abstract Seamounts and ridges are often invoked to explain subduction‐related phenomena such as flat slab generation, but the extent of their involvement remains controversial. An analysis of seismicity in the region of the Pampean flat slab through an application of an automated catalog generation algorithm resulted in 35,924 well constrained local ...
A. Maharaj +5 more
wiley +1 more source
Geochemistry, Geophysics, Geosystems, Volume 24, Issue 10, October 2023., 2023 Abstract Torn and bent slabs are usually associated with flat‐slab subduction where the descending plate develops a horizontal geometry beneath the overlying continent. How such slab dynamics modify the surrounding mantle flow and the overriding plate remains enigmatic.
Xiaowen Liu, Russell Pysklywec
wiley +1 more source
Tectonics, Volume 42, Issue 8, August 2023., 2023 Abstract The southern Central Andes (SCA, 27°–40°S) exhibit a complex deformation pattern that is influenced by multiple factors, including the present‐day dip angle of the subducting oceanic Nazca plate and the influence of inherited heterogeneities in the continental South American plate. This study employs a data‐driven geodynamic workflow to assess
Michaël Pons +4 more
wiley +1 more source
Tectonics, Volume 42, Issue 8, August 2023., 2023 Abstract The Upper Cretaceous Frontier Formation in southwestern Montana is coeval with the transition from Sevier‐ to Laramide‐style tectonism in the Idaho‐Montana sector of the North American Cordillera. To better constrain the timing of initial exhumation above the Laramide‐style Blacktail‐Snowcrest arch, we use biostratigraphic data, sandstone ...
E. S. Finzel +3 more
wiley +1 more source
Stepwise Widening of the Central Andes—The Role of the Lower Crust
Geophysical Research Letters, Volume 50, Issue 12, 28 June 2023., 2023 Abstract The outward growth of many orogens occurs through pulsed migration of the strain front. During Cenozoic shortening of the central Andes, the strain front abruptly migrated ∼400 km eastward across the Altiplano, isolating the plateau interior from major deformation.
Huilin Wang, Claire A. Currie
wiley +1 more source