Erosional features as indicators of thrust fault activity (Nankai Trough, Japan)

Alves, Tiago Marcos; Strasser, Michael; Moore, Gregory F.

doi:10.1016/j.margeo.2013.07.011

Cited by 28 publications

(31 citation statements)

References 67 publications

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“…Once again, local structures denoting shearing and pull-apart are observed at the extensional part of the MTD are more reliable kinematic indicators than ramps, as they respond to the evacuation of displaced material, rather than to the geometry of the ramp below (e.g. Alves et al, 2014b) (Fig. 12d).…”

Section: Thrusting and Foliation In Frontally Confined Mtds Of Se Crementioning

confidence: 95%

“…7b). Gawthorpe and Clemney (1985) and Trincardi and Argnami (1990) report that most ramps trend perpendicular to the main flow or movement direction, a postulate reassessed by Omosanya and Alves (2013) for salt-rich margins and by Alves et al (2014b) for tectonically active margins.…”

Section: Ramps and Flats In Basal Shear Surfacesmentioning

confidence: 97%

“…For instance, Alves et al (2014b) showed that the direction of transport of an MTD from Nankai (SE Japan) differs 30 e45 from the strike of scarps and ramps at its base ( Fig. 7b and c).…”

Section: Ramps and Flats In Basal Shear Surfacesmentioning

confidence: 99%

“…Basal ramps are also associated with zones in MTDs with distinct geological properties, and show ramps and other features can be unreliable kinematic indicators. Alves et al (2014b) postulated that the generation of basal ramps relates to the combined effect of the erosional power of the mass-transport body and preexisting seafloor roughness, and not solely to the transport directions of MTDs. Basal glide planes may be complex on seismic data, rather than comprising a single surface between undisturbed strata and the base of displaced blocks (Fig.…”

Section: Ramps and Flats In Basal Shear Surfacesmentioning

confidence: 99%

“…Kvalstad et al (2005) recognised in Norway that a two-layered structure is associated with the build-up of pore pressure near the seafloor, thus predisposing slope strata to fail. If near-seafloor lithology is more homogeneous, submarine slides will be devoid of blocks, more recurrent, and alternating with turbidite successions such as those of SE Japan and SE Spain (Kleverlaan, 1987;Dabrio, 1990;Haughton, 1994Haughton, , 2000Strasser et al, 2011;Alves et al, 2014b). A second pre-conditioning factor of importance is the presence of sandy material at the base of large blocks (Alves and Lourenço, 2010).…”

Section: Pre-conditioning Factors For the Generation Of Submarine Slimentioning

confidence: 99%

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Submarine slide blocks and associated soft-sediment deformation in deep-water basins: A review

Alves

2015

Marine and Petroleum Geology

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109

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a b s t r a c tThree-dimensional (3D) seismic and outcrop data are used to review the significance of submarine slide blocks and associated soft-sediment deformation structures in deep-water basins. Submarine slide blocks are generated during major instability events in a variety of geological settings and their size exceeds that of boulders, which are <4.1 m. Slide blocks can be~500 m high by >4.5 km long on a number of continental margins, presenting internal folding, thrusting and rolling over basal brecciaconglomerate carpets. In addition, soft-sediment deformation structures such as foliated strata, intrafolial folds, tiling, bookshelf sliding and dilational jogs reflect important shearing within blocks and their basal glide planes. This work proposes that buried blocks and associated coarse-grained debrites are capable of forming prolific reservoir intervals for hydrocarbons and mineralization. Three-dimensional leakage factor models show the bulk of fluid flow to be focused in vertical and horizontal surfaces within, and immediately below displaced blocks. The generation of large slide blocks can also mark the sudden release of overburden pressure, and result in the loss of seal competence above existing hydrocarbon fields. Ultimately, this review clarifies the present-day understanding on the modes of formation of submarine slide blocks, confirming their economic importance in deep-water basins throughout the world.

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Section: Thrusting and Foliation In Frontally Confined Mtds Of Se Crementioning

confidence: 95%

Section: Ramps and Flats In Basal Shear Surfacesmentioning

confidence: 97%

“…For instance, Alves et al (2014b) showed that the direction of transport of an MTD from Nankai (SE Japan) differs 30 e45 from the strike of scarps and ramps at its base ( Fig. 7b and c).…”

Section: Ramps and Flats In Basal Shear Surfacesmentioning

confidence: 99%

Section: Ramps and Flats In Basal Shear Surfacesmentioning

confidence: 99%

Section: Pre-conditioning Factors For the Generation Of Submarine Slimentioning

confidence: 99%

See 3 more Smart Citations

Submarine slide blocks and associated soft-sediment deformation in deep-water basins: A review

Alves

2015

Marine and Petroleum Geology

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151

109

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Flow dynamics of Nankai Trough submarine landslide inferred from internal deformation using magnetic fabric

Kanamatsu

Kawamura

Strasser

et al. 2014

Geochem. Geophys. Geosyst.

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Submarine landslide deposits in an active subduction zone were investigated by Integrated Ocean Drilling Program Expedition 333 as the ''Nankai Trough Submarine Landslides History.'' The expedition recovered a Pleistocene to Holocene sequence of stacked mass-transport deposits at Site C0018, located within a slope basin on the footwall of the megasplay fault in the Nankai Trough off the Kii Peninsula, southwest Japan. Six mass-transport deposit units intercalated with coherent intervals were recovered from the upper 190 m of the drilled succession. Anisotropy of magnetic susceptibility variations within mass-transport deposit units was used to ascertain their rheology. Shape parameters and magnetic fabric orientation reveal inhomogeneity through the sequences, indicating that different compaction and shear occurred within individual units. The upper intervals of younger units generally represent a magnetic fabric formed under vertical compression. However, the lower intervals involve magnetic fabrics indicating lateral shear with in-depth gradual change. In the older mass-transport deposit, a distribution of magnetic foliation forms tightly folded strata, indicating different sliding patterns from the younger mass-transport deposit units. Using available paleomagnetic data, the shear directions of basal intervals of units are reoriented, producing two different sliding orientations. Variation in the flow type and supply route is interpreted to reflect the slope condition (e.g., slope gradient and susceptibility to ground motion), which has been controlled by local tectonic evolution of the accretionary wedge.

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Strain decoupling reveals variable seismogenic risk in SEJapan (Nankai Trough)

Tuyl

Alves

Moore

2015

Geochem Geophys Geosyst

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The determination of in situ stress states is vital in understanding the behavior of faults and subsequent seismogenesis of accretionary prisms. In this paper, a high-quality 3-D seismic volume is used to map the depth of the extensional-compressional decoupling (ECD) boundary in the accretionary prism of Nankai, with the prior knowledge that strike-slip and compressional stresses occur deeper than 1250 m below seafloor (mbsf) in the Kumano Basin, changing to extension toward the seafloor. A total of 1108 faults from the accretionary prism are analyzed to estimate paleostresses via fault inversion and slip tendency techniques. A key result in this paper is that the ECD boundary can be used as a proxy to identify active structures on accretionary prisms as its depth depends on (a) local tectonic uplift in areas adjacent to active faults and (b) the thickness of sediment accumulated above active thrust anticlines. The depth of the ECD boundary ranges from 0 to 650 mbsf, being notably shallower than in the Kumano Basin. In Nankai, frontal regions of the imbricate-thrust zone, and the megasplay fault zone, reveal the shallower ECD depths and correlate with the regions where faulting is most active. As a corollary, this work confirms that estimates of stress state variability based on the analysis of 3-D seismic data are vital to understand the behavior of faults and potential seismogenic regions on convergent margins.

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Erosional features as indicators of thrust fault activity (Nankai Trough, Japan)

Cited by 28 publications

References 67 publications

Submarine slide blocks and associated soft-sediment deformation in deep-water basins: A review

Submarine slide blocks and associated soft-sediment deformation in deep-water basins: A review

Flow dynamics of Nankai Trough submarine landslide inferred from internal deformation using magnetic fabric

Strain decoupling reveals variable seismogenic risk in SEJapan (Nankai Trough)

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