Normal view MARC view ISBD view

Recent plate motions in the Galapagos area / Richard Hey.

By: Hey, Richard.
Contributor(s): Johnson, G. Leonard | Lowrie, Allen.
Material type: TextTextUSA : Geological Society of America Bulletin, 1977Description: 20 hojas : ilustraciones ; 28 cm.Subject(s): Tectónica de placas | Ecuador | Islas GalápagosAbstract: Recent accretion on the Cocos-Nazca spreading center has been asymmetric, with more material (along most of the rise) added to the Cocos than to the Nazca plate. There is evidence in the magnetic record that some of this asymmetric accretion has resulted from small discrete jumps of the rise axis to the south, forming and destroying transform faults. Relative and absolute models of instantaneous plate motions derived here provide an accurate representation of recent motions in the east Pacific. The existence of a self-consistent model that fits all the relative-motion data provides strong support for the hypothesis that plates behave rigidly. In addition, the exceptional agreement between the relative-motion and absolute-motion models provides strong support that the Wilson-Morgan hotspot hypothesis holds for the recent past. In particular, the agreement of the predicted instantaneous azimuths of the Cocos and Carnegie Ridges with their observed azimuths strongly suggests that at least the young parts of both aseismic ridges were formed by the motion of the Cocos and Nazca plates over a Galapagos hotspot.
Tags from this library: No tags from this library for this title.
    average rating: 0.0 (0 votes)
Item type Current location Call number Copy number Status Date due Barcode Item holds
Material de apoyo Material de apoyo BIBLIOTECA DE ING. DE GEOLOGIA Y PETROLEOS
PUBE-HE / 197703 /82 (Browse shelf) Ej. 1 Available 152554
Total holds: 0

Incluye referencias bibliográficas. Gelogical Society of America Bulletin, v.88 p. 1385-1403, 15 fgs. 3 tblas, october 1977

Recent accretion on the Cocos-Nazca spreading center has been asymmetric, with more material (along most of the rise) added to the Cocos than to the Nazca plate. There is evidence in the magnetic record that some of this asymmetric accretion has resulted from small discrete jumps of the rise axis to the south, forming and destroying transform faults.

Relative and absolute models of instantaneous plate motions derived here provide an accurate representation of recent motions in the east Pacific. The existence of a self-consistent model that fits all the relative-motion data provides strong support for the hypothesis that plates behave rigidly. In addition, the exceptional agreement between the relative-motion and absolute-motion models provides strong support that the Wilson-Morgan hotspot hypothesis holds for the recent past. In particular, the agreement of the predicted instantaneous azimuths of the Cocos and Carnegie Ridges with their observed azimuths strongly suggests that at least the young parts of both aseismic ridges were formed by the motion of the Cocos and Nazca plates over a Galapagos hotspot.

Facultad de Geología y Petróleos Donación 2014/07/09 $ 1.00 Ej. 1 BIGP 26689

There are no comments for this item.

Log in to your account to post a comment.

Powered by Koha