Rotational Slumping and the Recognition of Disconformities

Williams, Eugene G.; Guber, Albert L.; Johnson, Abigail M.

doi:10.1086/627086

Cited by 16 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, similar deep-seated failures occurred during the excavation of the Panama Canal (Binger, 1948;McCullough, 1978;and Lutton et al, 1979). River in Canada, and in subsurface deep-water channels (Williams, et al, 1965;Williams et al, 1985;Beaubouef and Friedmann, 2000;Brooks, 2003;Deptuck et al, 2003).…”

Section: Evolution Of Channel-levee Systemsmentioning

confidence: 85%

Seismic geomorphology, lithology, and evolution of the late Pleistocene Mars-Ursa turbidite region, Mississippi Canyon area, northern Gulf of Mexico

et al. 2007

View full text Add to dashboard Cite

show abstract

Section: Evolution Of Channel-levee Systemsmentioning

confidence: 85%

Seismic geomorphology, lithology, and evolution of the late Pleistocene Mars-Ursa turbidite region, Mississippi Canyon area, northern Gulf of Mexico

et al. 2007

View full text Add to dashboard Cite

show abstract

“…The Cretaceous canyon system was flanked by large bounding faults that parallel The faulting is interpreted to reflect "rotated channel-margin sliding" sensu Sawyer et al (2007) and are similar to some outcrop examples of erosion-dominated channels (Williams et al, 1965;Cronin et al, 2007). These faults are the result of …”

Section: Canyon-margin Faultingmentioning

confidence: 96%

Two fundamentally different types of submarine canyons along the continental margin of Equatorial Guinea

Jobe

Lowe

Uchytil

2011

Marine and Petroleum Geology

155

View full text Add to dashboard Cite

Most submarine canyons are erosive conduits cut deeply into the world's continental shelves through which sediment is transported from areas of high coastal sediment supply onto large submarine fans. However, many submarine canyons in areas of low sediment supply do not have associated submarine fans and show significantly different morphologies and depositional processes from those of 'classic' canyons. Using three-dimensional seismic reflection and core data, this study contrasts these two types of submarine canyons and proposes a bipartite classification scheme.The continental margin of Equatorial Guinea, West Africa during the late Cretaceous was dominated by a classic, erosional, sand-rich, submarine canyon system. This system was abandoned during the Paleogene, but the relict topography was reactivated in the Miocene during tectonic uplift. A subsequent decrease in sediment supply resulted in a drastic transformation in canyon morphology and activity, initiating the 'Benito' canyon system. This non-typical canyon system is aggradational rather than erosional, does not indent the shelf edge and has no downslope sediment apron. Smooth, draping seismic reflections indicate that hemipelagic deposition is the chief depositional process aggrading the canyons. Intra-canyon lateral accretion 2 deposits indicate that canyon concavity is maintained by thick (> 150 m), dilute, turbidity currents. There is little evidence for erosion, mass wasting, or sand-rich deposition in the Benito canyon system. When a canyon loses flow access, usually due to piracy, it is abandoned and eventually filled. During canyon abandonment, fluid escape causes the successive formation of 'cross-canyon ridges' and pockmark trains along buried canyon axes.Based on comparison of canyons in the study area, we recognize two main types of submarine canyons: 'Type I' canyons indent the shelf edge and are linked to areas of high coarse-grained sediment supply, generating erosive canyon morphologies, sandrich fill, and large downslope submarine fans/aprons. 'Type II' canyons do not indent the shelf edge and exhibit smooth, aggradational morphologies, mud-rich fill, and a lack of downslope fans/aprons. Type I canyons are dominated by erosive, sandy turbidity currents and mass wasting, whereas hemipelagic deposition and dilute, sluggish turbidity currents are the main depositional processes sculpting Type II canyons. This morphology-based classification scheme can be used to help predict depositional processes, grain size distributions, and petroleum prospectivity of any submarine canyon.

show abstract

“…Figs. 15, 17;Gennesseaux, 1966;Williams et al, 1965). If, on the other hand, transport continued beyond this stage, and if sufficient mud was present in the flow, then successively more mature (differentiated) beds resulted until finally the typical X--Y--Z graded sequence was produced (Fig.…”

Section: Slide-sheet Conglomeratesmentioning

confidence: 99%

Redeposited conglomerates in a miocene flysch sequence at Blackmount, Western Southland, New Zealand

Carter

Norris

1977

Sedimentary Geology

View full text Add to dashboard Cite

Carter, R.M. and Norris, R.J., 1977. Redeposited conglomerates in a Miocene flysch sequence at Blackmount, western Southland, New Zealand, Sediment. Geol., 18: 289--319.The Middle Miocene Monowai Formation represents a gravel delta that prograded south into a flysch basin complex developed along the Moonlight Tectonic Zone, southern New Zealand. The delta-slope environment was characterized by a conglomeratic sequence up to 500 m thick. Most of the gravel was moved downslope by mass-transport processes. A complete spectrum exists from synsedimentary slide sheets (up to 10 m thick and 100 m long) that retain pre-sliding sedimentary structures, to more mature mass-transported sediment types in which all original structures have been destroyed. The most distal deposits include ungraded homogeneous pebble conglomerates up to 3 m thick. Some of the more mature redeposited conglomerate--sand--mud units (X--Y--Z sequences) are between 2 and 10 m thick; they comprise a basal X-division of bouldery conglomerate, a middle Y-division of pebbly mudstone or pebbly sandstone, and an upper Z-division of hydroplastically folded mudstone. Though X--Y--Z sequences may have been deposited from very proximal turbidity or fluxoturbidity currents, inertia-flow emplacement seems more likely. An inertia-flow mode of emplacement also seems most probable for the other redeposited sediment types described from the Monowai Formation.

show abstract

Rotational Slumping and the Recognition of Disconformities

Cited by 16 publications

References 0 publications

Seismic geomorphology, lithology, and evolution of the late Pleistocene Mars-Ursa turbidite region, Mississippi Canyon area, northern Gulf of Mexico

Seismic geomorphology, lithology, and evolution of the late Pleistocene Mars-Ursa turbidite region, Mississippi Canyon area, northern Gulf of Mexico

Two fundamentally different types of submarine canyons along the continental margin of Equatorial Guinea

Redeposited conglomerates in a miocene flysch sequence at Blackmount, Western Southland, New Zealand

Contact Info

Product

Resources

About