Edades k/ar en algunos cuerpos plutónicos del graben cauca-patía y norte de la cordillera occidental

The K/Ar dates obtained in the Sabanalarga and Buga batholiths and in the Cambumbia and Irra Stocks, confirm and make evident a plutonic event in the Albian and Cenomanian range, that affected the western flank of the Central Cordillera and the Cauca-Patía trough between the Central and the Occident...

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Autores:: González I., Humberto
Londoño G., Ana Cristina

Tipo de recurso:: Article of journal

Fecha de publicación:: 1998

Institución:: Universidad Nacional de Colombia

Repositorio:: Universidad Nacional de Colombia

Idioma:: spa

Description
Summary:	The K/Ar dates obtained in the Sabanalarga and Buga batholiths and in the Cambumbia and Irra Stocks, confirm and make evident a plutonic event in the Albian and Cenomanian range, that affected the western flank of the Central Cordillera and the Cauca-Patía trough between the Central and the Occidental Cordillera of Colombia. This plutonism is calc-alkaline with type I granitoids. The Irra Stock intrudes basic volcanic rocks from the Barroso Formation, which confirms the late Cretaceous inferred age assigned to this unit, based on the paleontological evidences. Although the age obtained for the Amaime Gabbro is in the same range of the former event, seems to correspond better to a thermal and tectonic event, registered regional, than to the crystallization of the magmatic body. The ages of Mistrato and Nudillales stocks indicate that a Paleogene calc-alkaline plutonic event is present in the Occidental Cordillera, began with the Mande Batolit setting and related minor bodies, and extended from the late Paleocene to the Eocene. However, the Mistrato Stock is complex both structurally and lithologically, with gabbroic facies, and its spatial relationship with the basic volcanic rocks could be comagmatic; in this case, the obtained ages correspond to a thermal event that produced the isotopic recrystalization. Although the Buritica Andesite is spatially associate to the Buritica Stock, it is younger than the Stock, and also has an intensive hydrothermal alteration that is not characteristic of the Stock or its associated facies. For these reasons, the Andesite is considered genetically independent.

Edades k/ar en algunos cuerpos plutónicos del graben cauca-patía y norte de la cordillera occidental

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