Controls on localization and densification of a modern décollement: Northern Barbados accretionary prism

Wallace, Glen; Moore, J. Casey; Dileonardo, C.

doi:10.1130/0016-7606(2003)115<0288:colado>2.0.co;2

Cited by 15 publications

(9 citation statements)

References 11 publications

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“…Renewed activity on the inner faults can be interpreted as a mechanical adjustment that thickens the wedge and maintains its critical taper angle [ Platt , ]. Differential advancement of the wedge (see e.g., southern Transects T02 and T03 relative to the northern Transect T01 in our study region) may be related to increased weakness of the basal décollement [ Wallace et al ., ] and/or to a possible southward increase in fluid pressure in the region [ Fagereng and Ellis , ; Reyners and Eberhart‐Phillips , ]. However, asynchronous episodes of rapid wedge advancement along the margin may also be controlled by other factors, such as along‐strike changes in sediment accumulation, or potential subduction of asperities over time (e.g., seamounts, see Transect T02).…”

Section: Discussionmentioning

confidence: 99%

The last 2 Myr of accretionary wedge construction in the central Hikurangi margin (North Island, New Zealand): Insights from structural modeling

Ghisetti¹,

Barnes

Ellis

et al. 2016

Geochem Geophys Geosyst

104

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Three depth-converted and geologically interpreted seismic profiles provide a clear image of the offshore outer accretionary wedge associated with oblique subduction of the Pacific Plate beneath the central Hikurangi margin. Plio-Quaternary turbidites deposited over the pelagic cover sequence of the Hikurangi Plateau have been accreted to the margin by imbrication along E-verging thrust faults that propagated up-section from the plate boundary decollement. Growth stratigraphy of piggy-back basins and thrusting of progressively younger horizons trace the eastward advance of the leading thrust front over 60 km in the last 2 Myr. Moderate internal shortening of fault-bounded blocks typically 4-8 km wide reflects rapid creation of thrust faults, with some early formed faults undergoing out-of-sequence reactivation to maintain critical wedge taper. Multistage structural restorations show that forward progression of shortening involves: (1) initial development of a~10-25 km wide ''proto-thrust'' zone, comprising conjugate sets of moderately to steeply dipping low-displacement (~10-100 m) reverse faults; and (2) growth of thrust faults that exploit some of the early proto-thrust faults and propagate up-section with progressive breakthrough of folds localized above the fault tips. The youngest, still unbreached folds deform the present-day seafloor. Progressive retro-deformations show that macroscopic thrust faults and folds account for less than 50% of the margin-perpendicular shortening imposed by plate convergence. Arguably, significant fractions of the missing components can be attributed to mesoscopic and microscopic scale layer-parallel shortening within the wedge, in the proto-thrust zones, and in the outer decollement zone.

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Section: Discussionmentioning

confidence: 99%

The last 2 Myr of accretionary wedge construction in the central Hikurangi margin (North Island, New Zealand): Insights from structural modeling

Ghisetti¹,

Barnes

Ellis

et al. 2016

Geochem Geophys Geosyst

104

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“…Thus, the sheared clay interval at 821.5-822.5 mbsf is interpreted as the plate boundary décol-lement zone between the subducting Pacific plate and the overlying prism of accreted sediment. It is noteworthy that the scaly clay décollement zone is more similar to the décollement zones in Costa Rica (e.g., Kimura, Silver, Blum, et al, 1997;Vannucchi and Tobin, 2000) and considerably thinner than the few tens of meters thick décolle-ment zones in Nankai and Barbados (Maltman et al, 1997;Wallace et al, 2003;Kinoshita et al, 2008).…”

Section: Structural Geologymentioning

confidence: 99%

“…Stratigraphic control on the location of plate boundary décollements has been proposed in the past on the basis of well log and seismic data from other subduction zones (e.g., Wallace et al, 2003). Here, the décollement occurs within a thick clay-rich layer.…”

Section: Core-log-seismic Integrationmentioning

confidence: 99%

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Chester¹,

Mori²,

Toczko³

et al. 2012

IODP Preliminary Report

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“…Heggland, 1997, 2004; Hurst et al , 2003; Huuse & Cartwright, 2004; Ligtenberg, 2005). Recently, academic studies have begun to employ 3D seismic techniques to understand the fluid–rock interactions in accretionary prisms demonstrating the role of detachment faults in fluid flow (McIntosh & Silver, 1996; Wallace et al , 2003). Increasing focus on shallow hazards along continental margins have shown linkages between fault slip and fluid flow during growth faulting (Dugan & Flemings, 2000).…”

Section: Fluid–rock Interactionsmentioning

confidence: 99%

3D seismic technology: the geological ‘Hubble’

2005

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The proliferation of three-dimensional (3D) seismic technology is one of the most exciting developments in the Earth Sciences over the past century. 3D re£ection seismic data provide interpreters with the ability to map structures and stratigraphic features in 3D detail to a resolution of a few tens of metres over thousands of square kilometres. It is a geological 'Hubble' , whose resolving power has already yielded some fascinating (and surprising) insights and will continue to provide a major stimulus for research into geological processes and products for many decades to come. Academic and other research institutions have a major role to play in the use of this data by exploiting the enormous volume of geological information contained in 3D seismic surveys.This paper reviews some of the recent advances in basin analysis made using the medium of 3D seismic data, focusing on the ¢elds of structural and sedimentary geology, £uid^rock interactions and igneous geology. It is noted that the increased resolution of the 3D seismic method provided the essential catalyst necessary to stimulate novel observations and discover new geological structures such as mud diapir feeders, km-long gas blow-out pipes, giant pockmarks and sandstone intrusions, and to capture the spatial variability of diagenetic fronts.The UKs ¢rst impact crater was also discovered using 3D seismic data. The potential for future developments in this ¢eld of geophysical interpretation is considerable, and we anticipate that new discoveries will be made in many years to come.

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Controls on localization and densification of a modern décollement: Northern Barbados accretionary prism

Cited by 15 publications

References 11 publications

The last 2 Myr of accretionary wedge construction in the central Hikurangi margin (North Island, New Zealand): Insights from structural modeling

The last 2 Myr of accretionary wedge construction in the central Hikurangi margin (North Island, New Zealand): Insights from structural modeling

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3D seismic technology: the geological ‘Hubble’

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