Mass wasting processes along the Owen Ridge (northwest Indian Ocean)

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doi: 10.1016/j.margeo.2012.08.008
Author(s): Rodriguez, Mathieu; Fournier, Marc; Chamot-Rooke, Nicolas; Huchon, Philippe; Zaragosi, Sébastien; Rabaute, Alain
Author Affiliation(s): Primary:
Université Pierre and Marie Curie, Institut des Sciences de la Terre de Paris, Paris, France
Ecole Normale Supérieure de Paris, France
Université Bordeaux 1, France
Volume Title: Marine Geology
Source: Marine Geology, Vol.326-328, p.80-100. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0025-3227 CODEN: MAGEA6
Note: In English. 66 refs.; illus., incl. sects., sketch map
Summary: The Owen Ridge is a prominent relief that runs parallel to the coast of Oman in the NW Indian Ocean and is closely linked to the Owen Fracture Zone, an 800-km-long active fault system that accommodates today the Arabia-India strike-slip motion. Several types of mass failures mobilizing the pelagic cover have been mapped in details along the ridge using multibeam bathymetry and sediment echosounder. Here we present a synthetic map of the different types of mass wasting features observed along the ridge and we further establish a morphometric analysis of submarine landslides. The spatial variation of failure morphology is strongly related to the topography of the basement. The highest volumes of multi-events generated slides are mobilized along the southern portion of the ridge. There, the estimated volume of evacuated material during a slide is up to 45 km3. Combining these new observations with re-interpreted ODP seismic lines (Leg 117) documents sporadic mass wasting events through time along the southern segment of the ridge since its uplift in the Early Miocene, with a typical recurrence rate of the order of 105-106years. Although seismicity may still be the final triggering process, mass wasting frequency is mainly controlled by the slow pelagic sedimentation rates and hence, time needed to build up the 40-80 m thick pelagic cover required to return to a mechanically unstable pelagic cover. Abstract Copyright (2012) Elsevier, B.V.
Year of Publication: 2012
Research Program: DSDP Deep Sea Drilling Project
ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; 20 Geophysics, Applied; Acoustical methods; Acoustical profiles; Arabian Peninsula; Arabian Sea; Asia; Bathymetry; Cenozoic; Continental margin; DSDP Site 222; Deep Sea Drilling Project; Echo sounding; Failures; Geophysical methods; Geophysical profiles; Geophysical surveys; Indian Ocean; Indus Fan; Leg 117; Leg 23; Mass movements; Miocene; Neogene; Northwestern Indian Ocean; ODP Site 721; Ocean Drilling Program; Ocean floors; Oman; Owen Ridge; Owen fracture zone; Seamounts; Slumping; Sonar methods; Surveys; Tertiary
Coordinates: N150000 N220000 E0630000 E0580000
Record ID: 2013007323
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands