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

Rodriguez, Mathieu; Fournier, Marc; Chamot‐Rooke, Nicolas; Huchon, Philippe; Zaragosi, Sébastien; Rabaute, Alain

doi:10.1016/j.margeo.2012.08.008

Cited by 25 publications

(16 citation statements)

References 58 publications

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“…Actually, the East Oman Margin, the Owen Basin, and the Owen Ridge show compressive deformation precisely dated at 8.2-8.8 Ma at ODP Site 730 (Rodriguez et al, 2014) consistent with the age of the unconformity marking the uplift of the Southern Murray Ridge. An erosive surface at the top of the Owen Ridge, marked by large submarine failures (Rodriguez et al, 2012(Rodriguez et al, , 2013a, and dated at 8-9 Ma by ties with ODP Site 722, characterizes the younger uplift of the Owen Ridge (Rodriguez et al, 2014).…”

Section: U-unconformity and The Uplift Of The Murray Ridgementioning

confidence: 99%

Tectonics of the Dalrymple Trough and uplift of the Murray Ridge (NW Indian Ocean)

Rodriguez¹,

Chamot‐Rooke²,

Huchon³

et al. 2014

Tectonophysics

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International audienceThe Dalrymple Trough is a 150-km-long, 30-km-wide basin located at the northern termination of the Owen Fracture Zone (OFZ), which is the present-day active India-Arabia plate boundary. The Dalrymple Trough is closely associated with the Murray Ridge, a complex of prominent bathymetric highs located on its eastern flank. Recent multibeam mapping of the connection between the Dalrymple Trough and the OFZ revealed a horsetail structure, which suggests a close relationship between geological histories of both structures. However, the 3-6 Ma age of initiation of the OFZ contrasts with the commonly accepted Early Miocene emplacement of the Dalrymple Trough. Recent seismic lines document a new tectonic history of the Dalrymple Trough, involving two major episodes of deformation along the India-Arabia plate boundary at ~ 8-10 Ma and ~ 1.9 ± 0.9 Ma. The 8-10 Ma episode is marked by a system of folds linked to the main uplift of the southern Murray Ridge and the first uplift of the northern Murray Ridge. This episode is related to a global plate reorganization event in the Late Miocene, well expressed by intraplate deformation in the Central Indian Ocean. The Dalrymple Trough opened at ~ 1.9 ± 0.9 Ma subsequently to the formation of a stepover at the India-Arabia plate boundary, coeval with the regional M-unconformity in the Oman abyssal plain, which marks a structural reorganization of the Makran accretionary wedge, and the last uplift of the northern Murray Ridge

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Section: U-unconformity and The Uplift Of The Murray Ridgementioning

confidence: 99%

Tectonics of the Dalrymple Trough and uplift of the Murray Ridge (NW Indian Ocean)

Rodriguez¹,

Chamot‐Rooke²,

Huchon³

et al. 2014

Tectonophysics

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“…Stratigraphic studies document sporadic mass wasting events through time since the uplift of the Owen Ridge in the Miocene, with a typical recurrence rate of the order of 10 5 -10 6 yr . The recurrence rate is determined by converting into time the thickness of pelagic deposits lying between successive mass transport deposits according to sedimentation rates calculated at ODP sites (Shipboard Scientific Party, 1989;Rodriguez et al, 2012). The seismicity along the Owen Fracture Zone is rather low and scattered (Quittmeyer and Kafka, 1984;Gordon and DeMets, 1989;Fournier et al, 2001), the maximum magnitude recorded to date being a M w = 5.3 earthquake (Harvard CMT, 7 April 1985).…”

Section: Geological Background and Description Of The 17 • 20 N Submamentioning

confidence: 99%

Owen Ridge deep-water submarine landslides: implications for tsunami hazard along the Oman coast

Rodriguez

Chamot‐Rooke

Hébert

et al. 2013

Nat. Hazards Earth Syst. Sci.

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The recent discovery of voluminous submarine landslides along the Owen Ridge may represent a source of tsunami hazard for the nearby Oman coast. We assess the severity of this potential hazard by performing numerical simulations of tsunami generation and propagation from the biggest landslide (40 km<sup>3</sup> in volume) observed along the Owen Ridge. A finite-difference model, assimilating the landslide to a visco-plastic flow, simulates tsunami generation. Computation results show that Salalah city (190 000 inhabitants) is impacted by 2.5 m-high tsunami waves one hour after sediment failure. Higher wave elevation values (4 m) are reached in the low populated Sawqara Bay over 80 min after slide initiation. Although large submarine failures along remote oceanic ridges are infrequent, this study reveals an underestimated source of tsunami hazard in the Arabian Sea

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“…As indicated by dextral strike‐slip focal mechanisms of earthquakes, the Arabian plate moves northward slightly faster than the Indian plate with a relative motion of 3 ± 1 mm yr −1 , estimated independently from geodetic [ Reilinger et al ., ; Fournier et al ., ] and geological data [ DeMets et al ., , , ]. The OFZ cuts through the Owen Ridge, a prominent relief affected by numerous submarine landslides [ Rodriguez et al ., , ]. Offsets of the Owen Ridge observed on the seafloor imply a finite dextral displacement of 10–12 km along the OFZ [ Fournier et al ., , ].…”

Section: Introductionmentioning

confidence: 99%

Mode of opening of an oceanic pull‐apart: The 20°N Basin along the Owen Fracture Zone (NW Indian Ocean)

et al. 2013

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[1] Pull-apart basins are common features observed at releasing bends along major strike-slip faults. The formation and structural evolution of such basins have mostly been investigated in the continental domain and by sandbox laboratory experiments or numerical models. Here we present recently acquired multibeam bathymetry, 3.5 kHz echo sounder, and seismic profiles across the 20°N pull-apart Basin along the India-Arabia transform boundary, known as the Owen Fracture Zone (OFZ). Using nearby oceanic drilling (Deep Sea Drilling Project 222), we constrain the structural evolution of the basin since opening some 3 Myr ago. The 20°N Basin is large (90 km long and 35 km wide) despite limited transcurrent motion (~10 km). The first stage involved the formation of a step over along the OFZ and the subsequent isolation of a subsiding half graben. Extension and subsidence were further partitioned over three distinct subbasins separated by complex sets of transverse faults. The size of the basin was enhanced by gravity-driven collapse. The 20°N Basin has been a catchment for Indus turbidites since its opening, which provide a good record of syn-sedimentary deformation. The deformation related to the subsidence of the half graben mimics rollover structures commonly encountered in salt tectonics, suggesting that subsidence was accommodated by one or several décollement layers at depth. Despite a different rheological context, the subsurface structure of the nascent oceanic 20°N Basin is very similar to the more mature continental Dead Sea Basin along the Levant Fault, which also displays subbasins separated by transverse faults.

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

Cited by 25 publications

References 58 publications

Tectonics of the Dalrymple Trough and uplift of the Murray Ridge (NW Indian Ocean)

Tectonics of the Dalrymple Trough and uplift of the Murray Ridge (NW Indian Ocean)

Owen Ridge deep-water submarine landslides: implications for tsunami hazard along the Oman coast

Mode of opening of an oceanic pull‐apart: The 20°N Basin along the Owen Fracture Zone (NW Indian Ocean)

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