Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/32409
Title: Holocene neoglacial events in the Bransfield Strait (Antarctica). Paleogeographic and paleoclimatic significance
Author: Bárcena, María Ángeles
Fabrés Francés, Joan
Isla, Enrique
Flores Villarejo, José Abel
Sierro Sánchez, Francisco Javier
Canals Artigas, Miquel
Palanques Monteys, Albert
Keywords: Holocè
Estrets
Paleogeografia
Paleoclimatologia
Antàrtida
Holocene
Straits
Paleogeography
Paleoclimatology
Antarctica
Issue Date: Dec-2006
Publisher: Consejo Superior de Investigaciones Científicas (CSIC)
Abstract: The morphological characterisation of the western submarine island flanks of El Hierro and La Palma differentiates four type-zones that may give new insights into the evolution of oceanic island slopes. The different type-zones result from the interplay between constructive volcanic processes, hemipelagic settling and volcano collapses. The latter results in massive debris avalanche deposits, which form large volcaniclastic aprons. In most cases, the headwall scarps are clearly exposed on the emerged part of the islands. The events that occurred in the youngest and westernmost islands of El Hierro and La Palma have vertical runouts exceeding 6,000 m and volumes that can reach several hundred km3. The landslide frequency for the entire Canaries is one major event per 90 ka. Triggering mechanisms are closely related to magmatic processes. The increase in the shear stress is directly linked with the forceful intrusion of magma along ridge-rift systems, while in the western Canary Islands it seems that the main process reducing shear resistance may be related to the rise in pore pressure due to hydrothermal circulation.
Note: Reproducció del document publicat a: http://dx.doi.org/10.3989/scimar.2006.70n4607
It is part of: Scientia Marina, 2006, vol. 70, num. 4, p. 607-619
Related resource: http://dx.doi.org/10.3989/scimar.2006.70n4607
URI: http://hdl.handle.net/2445/32409
ISSN: 0214-8358
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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