Title

Origin of continental margin morphology: submarine-slide or downslope current-controlled bedforms, a rock magnetic approach

Abstract

Morphological features observed in both swath bathymetry and seismic reflection data are not unique, which introduces uncertainty as to their origin. The origin of features observed in the Humboldt Slide has generated much controversy because the same features have been interpreted as a submarine failure deposit versus current-controlled sediment waves. It is important to resolve this controversy because similar structures are observed on many continental margins and the origin of these features needs to be understood. Anisotropy of magnetic susceptibility (AMS) measurements on sediment samples acquired from the Humboldt Slide reveal that the top ∼ 8 m have not experienced post-depositional deformation. This suggests that these features are formed by primary deposition associated with downslope currents. Using the same AMS technique on a core acquired north of the Humboldt Slide in a region with no geophysical evidence for post-depositional deformation, we were able to identify a ∼ 1 m thick deposit that appears to be a small slump.

Publication Date

6-5-2007

Journal or Conference Title

Marine Geology

Volume

240, Issues 1-4

Pages

19-41

Publisher Place

New York, NY, USA

Publisher

Elsevier

Digital Object Identifier (DOI)

10.1016/j.margeo.2007.01.012

Document Type

Journal Article

Rights

Copyright © 2007 Elsevier B.V. All rights reserved.