Control of internal structure and fluid-migration pathways within the Barbados Ridge décollement zone by strike-slip faulting: Evidence from coherence and three-dimensional seismic amplitude imaging

Dileonardo, C.; Moore, J. Casey; Nissen, Susan E.; Bangs, N. L.

doi:10.1130/0016-7606(2002)114<0051:coisaf>2.0.co;2

Cited by 17 publications

(12 citation statements)

References 37 publications

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“…The amplitude map of the décollement in the present study is different from those of previous studies (Shipley et al. 1994, 1997; DiLeonardo et al. 2002), in that the décollement reflection is dominantly of negative polarity.…”

Section: Discussioncontrasting

confidence: 99%

“…(1994, their figure 3) identified small areas of positive polarity in the décollement. These small anomalous areas are not obvious in the amplitude map of the décollement by DiLeonardo et al. (2002, their figure 3), which shows much larger areas of positive amplitude, covering over 50% of the décollement.…”

Section: Discussionmentioning

confidence: 94%

“…The seismic profiles with the negative‐polarity to positive‐polarity transition toward the areas with positive décollement reflection in Shipley et al. (1994, their figure 2) and DiLeonardo et al. (2002, their figure 2) show that the negative polarity and the positive polarity are separated by a zone of degraded seismic signal.…”

Section: Discussionmentioning

confidence: 99%

“…However, the trough of the negative‐polarity décollement, although the amplitude is reduced and the post‐cursor peak of this reduced‐amplitude trough is weak, appears to continue beneath the peak, which was interpreted as the décollement by Shipley et al. (1994) and DiLeonardo et al. (2002).…”

Section: Discussionmentioning

confidence: 99%

“…2000). DiLeonardo et al. (2002) suggested that the northeast‐trending amplitude band in the décollement is controlled by arc‐oblique, northeast‐trending strike‐slip faults that cut across the incoming oceanic plate and extend beneath the accretionary prism.…”

Section: Discussionmentioning

confidence: 99%

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Northern Barbados accretionary prism: Structure, deformation, and fluid flow interpreted from 3D seismic and well‐log data

Cukur

Lee

et al. 2009

Island Arc

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We reanalyzed 3D seismic reflection and logging-while-drilling data from the toe of the northern Barbados accretionary prism to interpret structure, deformation, and fluid flow related to subduction processes. The seafloor amplitude and coherence reveal an abrupt change in the thrust orientation from NNE at the thrust front and north and NNW about 5 km west of the thrust front. These thrust sets are separated by a triangular-shaped quiet area, which may represent a zone of low strength. The northeast-trending band of strong negative amplitude and high coherence in the décollement, known to be an interval of arrested consolidation, overlaps the quiet area, suggesting that the arrested consolidation may be related to the lack of thrust imbrication, and thus, vertical drainage for fluid in the accretionary prism. Fractal analysis of the décollement and top of the subducting oceanic basement indicates that the relief of the décollement correlates with the topography of the oceanic basement. Differential compaction of the underthrust sediment overlying the rugged oceanic basement, together with the basement faults that penetrate into the décollement probably caused relief or even faulting in the décollement.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Northern Barbados accretionary prism: Structure, deformation, and fluid flow interpreted from 3D seismic and well‐log data

Cukur

Lee

et al. 2009

Island Arc

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Internal deformation of the southeast Levant margin through continued activity of buried mass transport deposits

2017

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Mass transport deposits (MTDs) are commonly regarded as motionless evidences of past mass wasting events. Three‐dimensional seismic surveys acquired offshore central Israel reveal continued long‐lasting and even current deformation of >1.5 Myr old MTDs, now buried hundreds of meters beneath and still impacting the seafloor. Faulting and folding of the Messinian‐Pliocene unconformity (M), at the base of the studied interval, represent the possible impacts of tectonic and halokinematic deformation. However, an ~200 m thick continuous stratified unit straddles the M and entirely separates the overlaying Plio‐Quaternary sedimentary stack from underlying faulting. Overlaying and etched into this stratified unit are headscarp regions of two up to 450 m thick buried MTDs, characterized by distinct combinations of chaotic seismic reflections and typically ~1 km wide detached and rotated blocks. “Crowns” of growth faults emanate upward from these MTD headwalls, truncating and deforming the overburden and offsetting overlaying reflections by tens of meters up to ~100 m below the seafloor. Moreover, asymmetric sagging and faulting of the overburden mimic the layout and flow pattern of the MTDs and rafted blocks within, providing kinematic indications of combined compaction and lateral flow. These observations imply that the MTDs undergo continuous postslumping differential compaction, combined with lateral mobilization. Additional smaller and younger buried MTDs distributed within the overburden are observed to portray similar deformation kinematics. We suggest that the buried MTDs provide deformational foci and pathways for downslope internal collapse of the continental margin at large, offering a new possible mechanism of thin‐skinned extension.

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The Geometry of the Continental Wedge and Its Relation to the Rheology and Seismicity of the Chilean Interplate Boundary

Maksymowicz

Tassara

2018

The Evolution of the Chilean-Argentinean Andes

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Control of internal structure and fluid-migration pathways within the Barbados Ridge décollement zone by strike-slip faulting: Evidence from coherence and three-dimensional seismic amplitude imaging

Cited by 17 publications

References 37 publications

Northern Barbados accretionary prism: Structure, deformation, and fluid flow interpreted from 3D seismic and well‐log data

Northern Barbados accretionary prism: Structure, deformation, and fluid flow interpreted from 3D seismic and well‐log data

Internal deformation of the southeast Levant margin through continued activity of buried mass transport deposits

The Geometry of the Continental Wedge and Its Relation to the Rheology and Seismicity of the Chilean Interplate Boundary

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