Correlation of Syn-Rift Structures Between Morocco and Nova Scotia, Canada

Tari, Gábor; Molnar, Jim

doi:10.5724/gcs.05.25.0132

Cited by 16 publications

(31 citation statements)

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“…Based on industrial seismic and potential field data, Tari and Molnar (2005) propose the existence of a high-relief accommodation zone at the Tafelney plateau, with the northern Moroccan margin acting as upper plate margin and the southern Moroccan margin representing a lower plate margin. More recently, Sibuet et al, (2012) proposed a new interpretation of the WACMA anomaly including two ridge jumps, the first jump leading to the existence of a part of the Canadian plate on the Moroccan side and a second jump leaving most of the exhumed upper mantle material on the Canadian side.…”

Section: Previous Workmentioning

confidence: 99%

“…During the MIRROR cruise (2011), a joint project between Ifremer, the Universities of Brest, El Jadida, and Lisbon, and the German BGR (Bundesanstalt fuer Geowissenschaften und Rohstoffe), seven combined wide-angle and multi-channel seismic profiles were acquired on the central Moroccan (Smith and Sandwell, 1997).The West African Coast Magnetic Anomaly (WACMA) is taken from Verhoef et al (1996) and Roeser et al (2002). The position of the salt is taken from Tari et al (2003), Tari and Molnar (2005), and Sahabi et al (2004) and that of the hinge line from Sahabi et al (2004) and Tari and Molnar (2005). The Jurassic carbonate platform is taken from Klitgord and Schouten (1986).…”

Section: Introductionmentioning

confidence: 99%

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Deep crustal structure of the North-West African margin from combined wide-angle and reflection seismic data (MIRROR seismic survey)

et al. 2015

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International audienceThe structure of the Moroccan and Nova Scotia conjugate rifted margins is of key importance for understanding the Mesozoic break-up and evolution of the northern central Atlantic Ocean basin. Seven combined multichannel reflection (MCS) and wide-angle seismic (OBS) data profiles were acquired along the Atlantic Moroccan margin between the latitudes of 31.5° and 33° N during the MIRROR seismic survey in 2011, in order to image the transition from continental to oceanic crust, to study the variation in crustal structure, and to characterize the crust under the West African Coast Magnetic Anomaly (WACMA).The data were modeled using a forward modeling approach. The final models image crustal thinning from 36 km thickness below the continent to approximately 8 km in the oceanic domain. A 100 km wide zone characterized by rough basement topography and high seismic velocities up to 7.4 km/s in the lower crust is observed westward of the West African Coast Magnetic Anomaly. No basin underlain by continental crust has been imaged in this region, as has been identified north of our study area. Comparison to the conjugate Nova Scotian margin shows a similar continental crustal thickness and layer geometry, and the existence of exhumed and serpentinized upper mantle material on the Canadian side only. The oceanic crustal thickness is lower on the Canadian margin

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Section: Previous Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deep crustal structure of the North-West African margin from combined wide-angle and reflection seismic data (MIRROR seismic survey)

et al. 2015

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“…7), suggest that these structures show an areal/temporal distribution that is progressively more complex basinwards: salt-related tectonic styles thus varied along strike from the coastal basins towards the deep oceanic basin, forming different tectonic domains characterized by different halokinetic features (Tari et al, 2000, Tari & Molnar, 2005Hafid et al, 2005a;Hafid, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…Widespread "filtering" due to salt, means that older vintage seismic lines do not image the basement underlying these folds as well as for much of the slope area. Newly acquired higher quality seismic data, however, show that these salt-cored folds, which represent the westernmost salt structures in the Essaouira offshore, are underlain by basement tilted blocks that are bounded by westerly dipping normal faults (Tari et al, 2000;Tari & Molnar, 2005; Fig. 6B).…”

Section: Role Of Salt During the Post-rift Atlasic Stagementioning

confidence: 99%

Salt tectonics and structural styles of the western High Atlas and the intersecting Essaouira‐Cap Tafelney segments of the Moroccan Atlantic margin

Hafid¹,

Bally

Salem

et al. 2010

Quaternary Carbonate and Evaporite Sedimentary Facies and Their Ancient Analogues

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The Safi-Agadir Moroccan coastal region is the only area where the Moroccan Atlantic salt province makes an inland incursion. It is also an area where the High Atlas alpine fold-belt intersects at right angles the Atlantic passive margin. Regional reflection seismic transects have been constructed across this area and its offshore extension. These are used here to analyze the effects of the post-sedimentary mobility of salt on sedimentation and on structural styles, and to link these effects to the main stages of the geodynamic evolution of the Atlas and the Atlantic systems. Salt was deposited in Late Triassic-Early Jurassic times during the last stage of rifting prior to continental breakup. It played an important role in the genesis of most of the structures presently encountered in the area. A great variety of salt structures have been identified, including: gentle salt-cored folds and pillows; compressional diapirs; and salt withdrawal synclines. Completely allochthonous pluri-kilometric salt sheets and canopies are bounded to the west by toe-thrust salt structures that overlie oceanic crust in the deep offshore basin. This offers a great variety of favourable settings for possible hydrocarbon traps.

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“…The conjugate margin, the Moroccan margin on the west coast of Africa, displays many of these same features -notably NE-trending tilted fault blocks and extensive salt tectonics (e.g. Le Roy & Piqué 2001;Tari & Molnar 2005). On both margins, the synrift, normal faults dip preferentially to the NW on the SW part of the margin, and dip to the SE on the NE part of the margin (e.g.…”

Section: Regional Geologymentioning

confidence: 97%

Variations in rifting style and structure of the Scotian margin, Atlantic Canada, from 3D gravity inversion

Dehler

Welford

2012

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Regional gravity data and a three-dimensional (3D) inversion approach were used to examine variations in crustal thickness and to extend seismic-based interpretations along the Scotian margin, Atlantic Canada. Constraints on Moho, crust and sedimentary layers were based on seismic refraction models and profiles of deep multichannel seismic data. A subsurface 3D density anomaly distribution was developed, using initial constraints from bathymetric data and seismic basement depth estimates, and inverting for crustal and subcrustal geometries. Predictions from the model include regional maps of Moho structure, crustal thickness and stretching factor. Depth slices allow comparison with seismic interpretations along three transects. The model predictions of variable width of crustal extension and northward thinning of oceanic crust agree with the seismic profiles. The density anomaly model shows significantly greater thinning and numerous block faulting beneath the northern margin and more uniform thinning to the SW. The fairly sharp transition between the two regions may be explained by a transfer zone separating different rifting regimes.

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Correlation of Syn-Rift Structures Between Morocco and Nova Scotia, Canada

Cited by 16 publications

References 0 publications

Deep crustal structure of the North-West African margin from combined wide-angle and reflection seismic data (MIRROR seismic survey)

Deep crustal structure of the North-West African margin from combined wide-angle and reflection seismic data (MIRROR seismic survey)

Salt tectonics and structural styles of the western High Atlas and the intersecting Essaouira‐Cap Tafelney segments of the Moroccan Atlantic margin

Variations in rifting style and structure of the Scotian margin, Atlantic Canada, from 3D gravity inversion

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