Browsing by Autor "V. Valencia"

Now showing 1 - 4 of 4

Contribuciones paleomagnéticas y geocronológicas sobre la paleogeografía del Jurásico en la Serranía del Perijá
(LA Referencia, 2012) Giovanny Nova; Paola Montaño; Germán Bayona; Augusto E. Rapalini; Camilo Montes; César Silva; Hernando Mahecha; A. Cardona; V. Valencia
Giovanny Nova1, Paola Catalina Montaño1, Germán Bayona1, Augusto E. Rapalini2, Camilo Montes3, César Silva1, Hernando Mahecha1, Agustín Cardona4 &amp; Víctor Valencia5 1Corporación Geológica ARES, Calle 44 A # 53-96, Bogotá, Colombia 2Instituto de Geofísica Daniel A. Valencio (INGEODAV), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, Buenos Aires, 1428, Argentina 3Geociencias, Universidad de Los Andes, Bogotá, Colombia 4Universidad Nacional de Colombia, Sede Medellín, Facultad de Minas, Medellín, Colombia 5School of Earth and Enviromental Sciences, Washington State University, WA 99164-2812, Pullman, WA 99164-2812 8 gbayona@cgares.orgCon el fin de establecer la evolución tectónica durante el Jurásico en la Serranía Perijá (SP) y su relación con el desintegración de Pangea y los terrenos acrecionados al margen noroccidental de Suramérica, fueron realizados análisis paleomagnéticos y de geocronología detrítica en rocas de la Formación La Quinta (Jurásico Medio) y Formación Rio Negro (Cretácico Inferior). Estas unidades fueron estudiadas en tres áreas del flanco occidental de la SP y corresponden de sur a norte a Codazzi, Manaure y Fonseca.....
Late Miocene – Pliocene eastward magmatic arc migration record in the Northern Andes at 5°N latitude, west-central Colombia
(Taylor & Francis, 2024) Sebastián Echeverri; Hugo Murcia; Eliana Botello; Juan Camilo Valencia‐Gómez; A. Cardona; Sebastián Rosero; Luis Alvaro Botero-Gómez; V. Valencia
Volcanic stratigraphy provides major insights to understand the spatial and temporal relationships between volcanic products and eruptive and post-eruptive processes. In the Andean chain, the Neogene to modern magmatic arc front has shown major changes in their spatial and compositional characteristics, which have been commonly related to significant modifications in the plate configuration. In the northern segment of the Colombian Andes, at 5°N latitude, a series of Upper Miocene-Pliocene volcanic and volcaniclastic units record the Neogene tectono-magmatic evolution associated with the formation of the Andean orogen. Stratigraphic observations allow recognising primary, secondary, and non-volcanic products that document intra- and inter-eruptive episodes characterised by Plinian eruption styles associated with the construction of volcanic edifices, followed by inter- and post-eruptive periods with significant fluvial dominated sedimentation. This indicates the reworking of volcanic products associated with the destruction and the collapse phase of volcanic edifices. New geochronological data (U-Pb and K-Ar) and several published ages suggest the existence of a continuous arc magmatism from the Miocene until the present, with major changes in its spatial position of the frontal arc: during the Late Miocene (~6 Ma), was exposed in the west between the Middle Cauca Valley to the Central Cordillera, while during the Pliocene (~4 Ma), it was located exclusively in the Central Cordillera. This configuration was the result of the inland magmatic arc migration associated with the subduction dynamics of the Nazca plate (Malpelo microplate) under the South American margin that also promoted a late phase of exhumation of the Cordillera. New stratigraphic, provenance, and chronostratigraphic constraints the Upper Miocene-Pliocene volcaniclastic units in the Colombian Andes at 5°N.Primary and secondary volcaniclastic deposits characterise the Late Miocene-Pliocene in the Colombian Andes at 5°N.A frontal magmatic arc migration in the Late Miocene-Pliocene in the Northern Andes at 5°N is documented.Continuous arc magmatism from the Late Miocene to the present, south of 5°N, is constrained. New stratigraphic, provenance, and chronostratigraphic constraints the Upper Miocene-Pliocene volcaniclastic units in the Colombian Andes at 5°N. Primary and secondary volcaniclastic deposits characterise the Late Miocene-Pliocene in the Colombian Andes at 5°N. A frontal magmatic arc migration in the Late Miocene-Pliocene in the Northern Andes at 5°N is documented. Continuous arc magmatism from the Late Miocene to the present, south of 5°N, is constrained.
Separation of the Guajira-Bonaire pair: 65-50Ma exhumation followed by 300 km right-lateral transtensional deformation
(2012) S. Zapata; A. Cardona; Camilo Montes; V. Valencia; J. V. Vervoort; Peter W. Reiners
Zapata, S.1, Cardona, A.2, Montes, C3, Valencia, V.4, Vervoort, J.4 &amp; Reiners, P.5 1 Corporación Geológica Ares, Calle 57 No. 23-09 of 202, Bogotá, Colombia. szapatah@gmail.com 2 Departamento de Procesos y Energía, Universidad Nacional de Colombia Sede Medellín, Medellín, Colombia agustincardonam@gmail.com 3 Geociencias, Universidad de Los Andes, Departamento de Geología, Bogotá, Colombia. 4 School of Earth and Environmental Sciences, Washington State University, Pullman, USA 5Department of Geosciences, University of Arizona, Tucson, USA Upper Eocene fluvial strata in the Island of Bonaire contain detrital components that were tracked to the basement massifs of the Guajira Peninsula in northern of Colombia. These components confirm previous hypothesis that the Guajira-Bonaire pair constitute a tectonic piercing point along the southern Caribbean Plate margin that was right-laterally displaced approximately 300km after middle Eocene times. Other possible sources, the nearby Curaҫao and the far away Santa Marta Massif, did not pass statistical similarity and overlap tests. U-Pb LA-ICP-MS from the metamorphic boulders of the Soebi Blanco Formation in Bonaire yields Grenvillian ages (1084Ma, 1130Ma and 1184Ma), while the detrital zircons recovered from the sandy matrix of the conglomerates contain populations with peaks of 1000 - 1200Ma, 750 - 950Ma and 200 – 300 Ma. Overlap and similarity tests run between these populations and published data from Guajira yield values of 0.750 and 0.680, which are significantly higher than the same comparison against the Santa Marta Massif (0.637 and 0.522), and the Curaҫao Island (0.629 and 0.467). Thermogeochronological results from the metamorphic clasts yield Paleocene-middle Eocene ages (65 – 50Ma) that confirm not only a regional-scale cooling event in this time period, but also help constrain the maximum depositional age (50Ma) of the poorly dated Soebi Blanco Formation.
U–Pb detrital zircon ages from the Aguapeí Group (Brazil): Implications for the geological evolution of the SW border of the Amazonian Craton
(Elsevier BV, 2014) Mauro César Geraldes; Camila Cardoso Nogueira; Gabriela Vargas-Mattos; Ramiro Matos; Wilson Teixeira; V. Valencia; Joaquín Ruiz