Morphotectonic and morphometric analysis of the Nazca plate and the adjacent offshore Peruvian continental slope - implications for submarine landscape evolution.

Kukowski, Nina, Hampel, Andrea, Hoth, Silvan and Bialas, Jörg (2008) Morphotectonic and morphometric analysis of the Nazca plate and the adjacent offshore Peruvian continental slope - implications for submarine landscape evolution. Marine Geology, 254 . pp. 107-120. DOI 10.1016/j.margeo.2008.05.017.

[img] Text
215_Kukowski_2008_MorphotectonicAndMorphometricAnalysisOf_Artzeit_pubid9991.pdf - Published Version
Restricted to Registered users only

Download (4Mb) | Contact
[img]
Preview
Text
Kukowski.pdf - Accepted Version

Download (6Mb) | Preview

Supplementary data:

Abstract

We use new swath bathymetry data acquired during the RV Sonne cruise GEOPECO and complement them with swath data from adjacent regions to analyse the morphotectonics of the Peruvian convergent margin. The Nazca plate is not covered with sediments and therefore has a rough surface along the entire Peruvian trench. The styles of roughness differ significantly along the margin with linear morphological features trending in various directions, most of them oblique to the trench and roughness magnitudes of a few to several hundred meters. The lower slope is locally very rough and at the verge of failure throughout the entire Peruvian margin, as a result of subduction erosion causing the lower slope to over-steepen. Using curvature attributes to quantitatively examine the morphology in the Yaquina and Mendaña areas revealed that the latter shows a larger local roughness both seaward and landward of the trench. However, the amplitude of morphological roughness is larger in the Yaquina area. We identified a 125 km2 large slump on the Lima middle slope. Morphometric dating suggests an age of 74500 years within 35 to 40% error. Estimated incision rates on the upper slope are between 0.1 and 0.3 mm per year suggesting that landscape evolution on the Peruvian submarine continental slope is similarly slow than that in the Atacama desert.

Document Type: Article
Keywords: swath bathymetry, morphotectonics, morphometry, convergent margins, Peru, submarine slumping, curvature analysis, morphometric dating, submarine landscape evolution, hazard potential
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
GFZ
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.margeo.2008.05.017
ISSN: 0025-3227
Projects: Future Ocean, GEOPECO
Expeditions/Models/Experiments:
Date Deposited: 03 Dec 2008 16:51
Last Modified: 04 Aug 2017 09:34
URI: http://oceanrep.geomar.de/id/eprint/1568

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...