Browsing by Autor "Camilo Montes"

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Angiosperm leaf cuticles from a revisited paleo-elevation site in the Eastern Cordillera of the northern Andes
(RELX Group (Netherlands), 2025) Aura Cuervo-Gómez; Camilo Montes; Mónica R. Carvalho; Camila Martínez; Lina C. Pérez-Ángel; Carmala Garzione; María Cuervo-Gómez; Ángela A. Sánchez-Galán; Jhon-Meyer Muñoz; Andrés Rodríguez-Corcho
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.....
Detrital Geochronology and Provenance Analyses of Andean Molasses as Markers of Northward Tectonic Transport
(2019) Mara Daniela Daniela Muoz Granados; Robinson O Villamil; Camilo Montes; Yamirka Rojas‐Agramonte; Germán Bayona; Felipe Lamus
Estimación de condiciones P-T en secuencias afectadas por metamorfismo de muy bajo a bajo grado: aplicación del parámetro B y la cristalinidad de illita y clorita en metasedimentos de la Alta Guajira
(2012) Mario Lara; A. Cardona; G Collo; Camilo Montes
Lara, M.1, Cardona, A.2, Collo, G.3 &amp; Montes, C.4 1Corporación Geológica Ares, Bogotá, Colombia. marioelarao@gmail.com 2Escuela de Química y Petróleos, Universidad Nacional de Colombia, Medellín, Colombia. agustincardonam@gmail.com 3Laboratorio de Análisis de Cuencas, Universidad Nacional de Córdoba, Córdoba, Argentina. 4Geociencias, Universidad de Los Andes, Bogotá, Colombia. La illita (Ill) y clorita (Chl) son minerales de arcilla usados para estimar valores aproximados de las condiciones de presión (parámetro b) y temperatura (índice de cristalinidad) en zonas de muy bajo grado metamórfico en metasedimentos. Esta estimación se realiza analizando el orden estructural y el grado de cristalinidad de los minerales arcillosos mediante Difracción de Rayos X.......
Evolution of paleogene basins in northwestern Southamerica: tracking the change from caribbean to nazca subduction
(2012) Germán Bayona; A. Cardona; Carlos Jaramillo; Camilo Montes; Andrés Mora
In the northern Andes, inversion of mesozoic extensional structures, have controlled the location of synorogenic successions and dispersal of detritus since Paleocene time. Detailed geologic mapping, tectosedimentological studies using provenance (petrography, heavy minerals, geochronology), biostratigraphy and termogeochronological data, conducted in several basins with paleogene strata across the present Eastern Cordillera, southern Llanos Basin and the Perijá Range, that reactivation of former normal faults broke the single Upper Cretaceous basin into different depocenters that migrates through the Paleogene period......
Middle Miocene closure of the Central American Seaway
(Center for Astrophysics Harvard & Smithsonian, 2014) Camilo Montes
Uranium-lead geochronology in detrital zircons and provenance analyses in eight boreholes and two surface stratigraphic sections in the northern Andes provide insight into the time of closure of the Central American Seaway. The timing of this closure has been correlated with Plio-Pleistocene global oceanographic, atmospheric, and biotic events. We found that a uniquely Panamanian Eocene detrital zircon fingerprint is pronounced in middle Miocene fluvial and shallow marine strata cropping out in the northern Andes but is absent in underlying lower Miocene and Oligocene strata. We contend that this fingerprint demonstrates a fluvial connection, and therefore the absence of an intervening seaway, between the Panama arc and South America in middle Miocene times; the Central American Seaway had vanished by that time. Early closing between oceans The Central American Seaway, which once separated the Panama Arc from South America, may have closed 10 million years earlier than is believed. Montes et al. report that certain minerals of Panamanian provenance began to appear in South America during the Middle Miocene, 15 to 13 million years ago (see the Perspective by Hoorn and Flantua). The presence of the minerals indicates that rivers were flowing from the Panama Arc into the shallow marine basins of northern South America. One interpretation of this finding is that large-scale ocean flow between the Atlantic and Pacific had ended by then. If this is true, then many models of paleo-ocean circulation and biotic exchange between the Americas need to be reconsidered. Science, this issue p. 226; see also p. 186
Neotropical terrestrial records indicate colder, more densely vegetated lowland landscapes between the middle and late Miocene
(RELX Group (Netherlands), 2025) Elena Stiles; Katharine W. Huntington; Zhennan Wang; Andrew Schauer; Nitzan Yanay; Carmala Garzione; Camilo Montes; Daniel E. Góngora; Andrés Vanegas; César Perdomo
PALEOMAGNETISM FROM JURASSIC AND EARLY CRETACEOUS ROCKS ON THE PERIJA RANGE WESTERN FLANK: INSIGHTS TO THE TECTONIC EVOLUTION FROM NW OF SOUTH AMERICA
(2012) Giovanny Nova R; Paola Montaño; Germán Bayona; Augusto E. Rapalini; Camilo Montes
The Perija Range is a mountain system located in the northwestern corner of Southamerica; upon western flank outcrop its rocks from La Quinta and Rio Negro formations, and the Cogollo Group that were deposited from the Jurassic to Early Cretaceous. Paleomagnetic analysis allow to document rotations on vertical axis and traslation of geologic terranes along of North Andes, especially those related with the Pangea fragmentation as the Mexican Blocks (Yucatan, Chortis, etc) and the Santa Marta Massif. Twenty nine paleomagnetic sites distributed in three areas from the western flank of the Perija Range were analyzed for testing if had changes in the rotation magnitude in several structural domains. In all, we colected 17 sites in the La Quinta Fm., 9 in the Rio Negro Fm. and 3 in the Cogollo Group. The results of our study were integrated to the paleomagnetic data reported from eastern flank allow us document clockwise rotations of 41±13° for Jurassic rocks and 45±13° for Cretaceous rocks. The values of positive inclination allow us suggest a stable paleolatitudinal position for the PR, adjacent to the Craton, between the Jurassic (+7.5°) and Cretaceous (+9.2°). This paleolatutudinal stability is opposite to the northward traslation given for the Santa Marta Massif in previous studies, inferring that between these blocks in subsoil should be exist a paleosuture in late Jurassic.
PALEOMAGNETISMO EN ROCAS DEL JURÁSICO Y CRETÁCICO INFERIOR EN EL FLANCO OCCIDENTAL DE LA SERRANÍA DEL PERIJÁ; CONTRIBUCIONES A LA EVOLUCIÓN TECTÓNICA DEL NW DE SURAMERICA
(2012) Giovanny Nova R; Paola Montaño; Germán Bayona; Augusto E. Rapalini; Camilo Montes
The Perija Range is a mountain system located in the northwestern corner of Southamerica; upon western flank outcrop its rocks from La Quinta and Rio Negro formations, and the Cogollo Group that were deposited from the Jurassic to Early Cretaceous. Paleomagnetic analysis allow to document rotations on vertical axis and traslation of geologic terranes along of North Andes, especially those related with the Pangea fragmentation as the Mexican Blocks (Yucatan, Chortis, etc) and the Santa Marta Massif. Twenty nine paleomagnetic sites distributed in three areas from the western flank of the Perija Range were analyzed for testing if had changes in the rotation magnitude in several structural domains. In all, we colected 17 sites in the La Quinta Fm., 9 in the Rio Negro Fm. and 3 in the Cogollo Group. The results of our study were integrated to the paleomagnetic data reported from eastern flank allow us document clockwise rotations of 41±13° for Jurassic rocks and 45±13° for Cretaceous rocks. The values of positive inclination allow us suggest a stable paleolatitudinal position for the PR, adjacent to the Craton, between the Jurassic (+7.5°) and Cretaceous (+9.2°). This paleolatutudinal stability is opposite to the northward traslation given for the Santa Marta Massif in previous studies, inferring that between these blocks in subsoil should be exist a paleosuture in late Jurassic.
Paleomagnetismo y Geocronología detrítica de rocas mesozoicas en la Alta Guajira
(2012) Paola C Montaño; Giovanny Nova; Germán Bayona; Augusto E. Rapalini; A. Cardona; Camilo Montes
Paola Catalina Montaño1, Giovanny Nova1, German Bayona1,2, Augusto Rapalini3, Agustín Cardona1,2,4 &amp; Camilo Montes1,2,51Corporación Geológica Ares, Bogotá, Colombia 2Instituto Smithsoniano de Investigaciones Tropicales 3Universidad de Buenos Aires, Argentina 4Universidad Nacional de Colombia Nacional, Sede Medellín, Medellín, Colombia 5Universidad De los Andes, Bogotá, Colombia pcmontano@cgares.org, gnova@cgares.org, gbayona@cgares.orgEn la Alta Guajira afloran bloques continentales al norte del Sistema de Fallas de Oca, los cuales estan aislados de los sistemas montañosos andinos de la Sierra Nevada de Santa Marta (SNSM) y de la Serranía de Perijá (SP). La sucesión estratigrafía del Jurásico y Cretácico Inferior de la Alta Guajira difiere de las reportadas en la SNSM, donde las unidades del Jurásico corresponden a extensos cuerpos plutónicos y sucesiones volcánicas. Rocas jurásicas en el sur de la Alta Guajira, pertenecientes a las formaciones Rancho Grande y Uitpana presentan una litología y estructuras sedimentarias similares a la Formación La Quinta de la SP, en donde las unidades del Jurásico son de origen volcano-sedimentario, y difieren de las unidades jurásicas marinas reportadas en el área de Cocinas, en la parte norte de la Alta Guajira......
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.