Terrane-boundary reactivation: A control on the evolution of the Northern Andes

Autor:	J.A. Aspden, M. Litherland
Rok vydání:	1992
Předmět:	geography geography.geographical_feature_category Subduction Geology Fault (geology) Ophiolite Graben Paleontology South American Plate Caldera Suture (geology) Seismology Earth-Surface Processes Terrane
Zdroj:	Journal of South American Earth Sciences. 5:71-76
ISSN:	0895-9811
DOI:	10.1016/0895-9811(92)90060-c
Popis:	The Andes of northern Ecuador and southern Colombia comprise two post-Oligocene cordilleras, each with its Plio-Pleistocene volcanic chain separated by the fault-bounded, inter-Andean depression or graben. Along the eastern Peltetec-Romeral fault occur Upper Jurassic ophiolitic rocks marking an ancient suture between the allochthonous Chaucah terrane in the west and the South American plate. Along the western Pujili-Cauca fault are Upper Cretaceous-lower Eocene ophiolites marking the accretion of the Cretaceous-Eocene Westner Cordillera. Post-Oligocne reactivation of these terane boundaries accounts for the origin of the cordilleras and graben and helps to explain the location of the double chain of Plio-Pleistocene volcanic centers. A caldera-graben model is suggested.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::200bd3985085fa354e1df196dae4b010 https://doi.org/10.1016/0895-9811(92)90060-c Zobrazit plný text záznamu