Skip to Main Content
Book Chapter

Influence of the subduction of the Carnegie volcanic ridge on Ecuadorian geology: Reality and fiction

By
François Michaud
François Michaud
Université Pierre et Marie Curie, Géoazur (IRD-CNRS-UNS), la Darse, BP48, 06235, Villefranche/Mer, France, and Departamento de Geologia, Escuela Politécnica Nacional, Andalucia n/s, C.P. 17-01-2755, Quito, Ecuador
Search for other works by this author on:
Cesar Witt
Cesar Witt
Université Pierre et Marie Curie, Géoazur (IRD-CNRS-UNS), la Darse, BP48, 06235, Villefranche/Mer, France, and Departamento de Geologia, Escuela Politécnica Nacional, Andalucia n/s, C.P. 17-01-2755, Quito, Ecuador
Search for other works by this author on:
Jean-Yves Royer
Jean-Yves Royer
Université Européenne de Bretagne and Université de Brest, Centre National de la Recherche Scientifique, Institut Universitaire Européen de la Mer, Laboratoire Domaines Océaniques, Place Copernic, 29280 Plouzané, France
Search for other works by this author on:
Published:
June 01, 2009

The proposed ages for the collision of the Carnegie Ridge with the South America trench, offshore Ecuador, range from 1 to 15 Ma. In this time frame, many geological features of Ecuador are commonly linked to the subduction of the Carnegie Ridge. (1) After the ridge collided with the trench at ca. 15 Ma, the subsequent interplate coupling produced high exhumation rates of volcanic materials at ca. 9 Ma. (2) The oblique convergence of the Carnegie Ridge would have caused the northward drift of the North Andean block and the opening of the Gulf of Guayaquil. (3) During the late Miocene, the subduction of the Carnegie Ridge would have triggered a regional tectonic inversion along the forearc. (4) Along the collision front of the ridge with the trench, subduction-related erosion is occurring, and the Ecuadorian continental margin is being uplifted in the present day. (5) The chemistry of the active volcanic arc is explained as resulting from the arrival of the Carnegie Ridge into the trench. For instance, the adakitic signal, which appears at 1.5 Ma, is thought to be ridge-induced. (6) The buoyancy of the subducted Carnegie Ridge would explain the flatness of the slab beneath Ecuador. In this paper, we review the geological evolution of the Northern Andes in order to establish which of these geological events may be related to the subduction of the Carnegie Ridge. This review suggests that there is no clear deformation linked with the subduction of the Carnegie Ridge or with its landward prolongation postulated at depth.

You do not currently have access to this article.

Figures & Tables

Contents

GSA Memoirs

Backbone of the Americas: Shallow Subduction, Plateau Uplift, and Ridge and Terrane Collision

Suzanne Mahlburg Kay
Suzanne Mahlburg Kay
Search for other works by this author on:
Víctor A. Ramos
Víctor A. Ramos
Search for other works by this author on:
William R. Dickinson
William R. Dickinson
Search for other works by this author on:
Geological Society of America
Volume
204
ISBN print:
9780813712048
Publication date:
June 01, 2009

References

Related

Citing Books via

Related Articles
Related Book Content
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal