Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 107-120 |
| Seitenumfang | 14 |
| Fachzeitschrift | Marine geology |
| Jahrgang | 254 |
| Ausgabenummer | 1-2 |
| Publikationsstatus | Veröffentlicht - 21 Aug. 2008 |
| Extern publiziert | Ja |
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 74,500 years within 35 to 40% error. Estimated incision rates on the upper slope are between 0.1 and 0.3 mm/yr suggesting that landscape evolution on the Peruvian submarine continental slope is similarly slow than that in the Atacama desert.
ASJC Scopus Sachgebiete
- Erdkunde und Planetologie (insg.)
- Ozeanographie
- Erdkunde und Planetologie (insg.)
- Geologie
- Erdkunde und Planetologie (insg.)
- Geochemie und Petrologie
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in: Marine geology, Jahrgang 254, Nr. 1-2, 21.08.2008, S. 107-120.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Morphotectonic and morphometric analysis of the Nazca plate and the adjacent offshore Peruvian continental slope - Implications for submarine landscape evolution
AU - Kukowski, Nina
AU - Hampel, Andrea
AU - Hoth, Silvan
AU - Bialas, Jörg
PY - 2008/8/21
Y1 - 2008/8/21
N2 - 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 74,500 years within 35 to 40% error. Estimated incision rates on the upper slope are between 0.1 and 0.3 mm/yr suggesting that landscape evolution on the Peruvian submarine continental slope is similarly slow than that in the Atacama desert.
AB - 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 74,500 years within 35 to 40% error. Estimated incision rates on the upper slope are between 0.1 and 0.3 mm/yr suggesting that landscape evolution on the Peruvian submarine continental slope is similarly slow than that in the Atacama desert.
KW - convergent margins
KW - curvature analysis
KW - hazard potential
KW - morphometric dating
KW - morphometry
KW - morphotectonics
KW - Peru
KW - submarine landscape evolution
KW - submarine slumping
KW - swath bathymetry
UR - http://www.scopus.com/inward/record.url?scp=48349141083&partnerID=8YFLogxK
U2 - 10.1016/j.margeo.2008.05.017
DO - 10.1016/j.margeo.2008.05.017
M3 - Article
AN - SCOPUS:48349141083
VL - 254
SP - 107
EP - 120
JO - Marine geology
JF - Marine geology
SN - 0025-3227
IS - 1-2
ER -