Low-temperature thermochronology of the northern Cordillera Real, Ecuador: Tectonic insights from zircon and apatite fission track analysis / Richard A. Spikings

By: Spikings, Richard
Contributor(s): Seward, Diane | Winkler, Wilfried | Ruiz M., Geoffrey
Material type: TextTextLanguage: English USA : American Geophysical Union, 2000Description: 649-668 páginas : ilustraciones, mapas, papersSubject(s): Cordillera Real -- Ecuador | Tectónica | TermocronologíaOther classification: PUBE-SP-200002-349 Online resources: Texto completo Scope and content: The post Early Cretaceous tectonic development of the northern Andean segment (north of 5øS) is loosely constrained by a series of partially and fully reset K/Ar ages. New apatite and zircon fission track data from three traverses across the Cordillera Real of Ecuador reveal distinct periods of accelerated crustal cooling during the Cenozoic. Fission track ages range from 65 to 14 Ma (zircon) and 44 to 8 Ma (apatite), with apatite mean track lengths ranging from 14.6 to 12.1 }am. These results record rapid cooling rates during - 43 - 30 Ma, 23 - 15 Ma, and 10 - 0 Ma occurring at temperatures below - 275øC. The events reflect up to - 9 km of crustal exhumation in various regions of the Cordillera in response to relative changes in the kinematics of the Farallon, Nazca, and South American plates. The exhumation hlstory of the Cordillera Real was not continuous but rather evolved during separate phases.
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The post Early Cretaceous tectonic development of the northern Andean segment (north of 5øS) is loosely constrained by a series of partially and fully reset K/Ar ages. New apatite and zircon fission track data from three traverses across the Cordillera Real of Ecuador reveal distinct periods of accelerated crustal cooling during the Cenozoic.
Fission track ages range from 65 to 14 Ma (zircon) and
44 to 8 Ma (apatite), with apatite mean track lengths ranging
from 14.6 to 12.1 }am. These results record rapid cooling rates during - 43 - 30 Ma, 23 - 15 Ma, and 10 - 0 Ma occurring at temperatures below - 275øC. The events reflect up to - 9 km of crustal exhumation in various regions of the Cordillera in response to relative changes in the kinematics of the Farallon, Nazca, and South American plates. The exhumation hlstory of the Cordillera Real was not continuous but rather evolved during separate phases.

Facultad de Geología y Petróleos

BIGP Donación 2014/10/08 25205 $ 0.01 Ej. 1 Biblioteca Facultad de Geología y Petróleos

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