La sucesión paleoambiental del cretácico de la región de tequendama y oeste de la sabana de bogotá, cordillera oriental colombiana

A stratigraphic, micropaleontologic and petrographic survey of ca. 4000 m of the Cretaceous Villeta, Guadalupe and Olini Groups and the Lomagorda Formation outcropping in the Tequendama and west of Bogotá regions, is presented. Two facial settings are recognized, and apparently controlled at times, by the Bituima Fault. East of the Bituima Fault, at least six stratigraphic sequences can be interpreted begining with the late Barremian calcareous-siliceous rocks of the Trincheras Formation and ending with the regressive arenites of the Labor and Tierna Formations. A clastic - evaporitic (7) phase is suggested for the late Aptian - early Albian (Socota and lower Capotes Formations) implying tectonic restriction of the basin and a deep-water setting. Anoxia at the sediment-water interface is inferred for intervals at the early Aptian (Trincheras Formation), the late Aptian - early Cenomanian (Socota, Capotes and Hilo Formations), the Turonian - Coniacian (La Frontera and Conejo Formations), and the late Campanian (the Plaeners Formation). West of the Bituima Fault, at least two sequences can be interpreted, begining with the Coniacian Lomagorda Formation and ending with the regressive Maastrichtian Nivel de Lutitas y Arenas. These distal, offshore facies were strongly influenced by upwelling (and anoxia) during the Coniacian - Santonian (Lidita Inferior Formation) and Campanian (Lidita Superior Formation) intervals. A correlation between both stratigraphic settings is attempted.

• Autores: Martínez R., Jose Ignacio; Vergara S., Luis Eduardo
• Tipo de recurso: Article of journal
• Fecha de publicación: 1999
• Institución: Universidad Nacional de Colombia
• Repositorio: Universidad Nacional de Colombia
• Idioma: spa
• OAI Identifier: oai:repositorio.unal.edu.co:unal/42054
• Acceso en línea: https://repositorio.unal.edu.co/handle/unal/42054; http://bdigital.unal.edu.co/32151/
• Palabra clave: Geología; Ciencias de la tierra; Geociencias; Geología; Ciencias de la tierra; Geociencias
• Rights: openAccess
• License: Atribución-NoComercial 4.0 Internacional