Browsing by Autor "Augusto E. Rapalini"

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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.....
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......