Quantitative analysis of the geometry of submarine channels: Implications for the classification of submarine fans

Clark, J. D.; Kenyon, Neil H.; Pickering, KT

doi:10.1130/0091-7613(1992)020<0633:qaotgo>2.3.co;2

Cited by 157 publications

(108 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1B). Both canyons have smooth morphologies and their sinuosity index (SI; calculated as the ratio of the distance along the channel axis to the straight-line valley length) is~1, classifying them as "straight" channels according to Clark et al (1992). The canyons C3 (5.87 km-long, SI-1.08) and C4 (5.42 km-long, SI-1.14) show complex canyon heads and share a common distal canyon at~140 m water depth (Sastre et al, 2010).…”

Section: Study Sitementioning

confidence: 99%

The role of mass-transport deposits and turbidites in shaping modern lacustrine deepwater channels

Corella

Loizeau

Kremer

et al. 2016

Marine and Petroleum Geology

View full text Add to dashboard Cite

a b s t r a c tSubaquatic canyons are an important pathway for sediment transport into oceanic and lacustrine basins. Understanding the mechanisms governing their geomorphological evolution is a key to predict the sediment distribution patterns through these sediment conduits as well as to implement geo-hazard assessments. Submerged channels developed in large lacustrine basins offer a small-scale natural laboratory to understand the sedimentological processes operating in submarine channels. For this reason, a multidisciplinary research initiative -including time-lapse, high-resolution bathymetric surveys, innovative coring using submersibles, in situ geotechnical tests, and geophysical and sedimentological analyses-was applied to unravel the factors controlling the geomorphological evolution of the Rhone delta channels in Lake Geneva during the last decades. The morphology of the lacustrine Rhone Delta consists of a freshwater delta system deeply incised by nine canyons (C1eC9). Geotechnical measurements in proximal areas and sediment cores retrieved in the distal fans at the end of each canyon revealed complex sediment dynamics. No turbidity current events have occurred in the easternmost canyons (C1eC4) during the last decades while the western canyons sediment record (C5eC9) indicated repeated flushing events during the 20 th century. The main "active" canyon C8 has been dominated by turbidite activity on the canyon floor with frequent overspill events along the levees. A large 6.2 Â 10 6 m 3 Mass-Transport Deposit (MTD) that resembles a debrite in its upper section was found in the distal area of the active channel. The MTD was dated at 1998e2000 CE and most likely originated from proximal delta areas affected by frequent slope failures of the steep channel walls. In situ geotechnical tests on the modern proximal channel floor showed an unconsolidated soft top-layer that might have served as a low-friction surface favouring the MTD long run-out distance to the distal part of the channel. The MTD has had a major effect morphological evolution of the distal channel by filling the existing conduit, indirectly promoting the formation of a new channel. The role of MTD emplacement in subaquatic channels has important implications for hydrocarbon exploration as they control channel avulsion processes and the location of sand-prone deposits. This study gives a detailed insight on poorly investigated short-term sedimentological dynamics that affect the long-term evolution of turbidite systems and channel migration processes. This detailed model of a river-dominated deep-lacustrine depositional system can be used as an analog for similar modern and ancient deep-water systems.

show abstract

Section: Study Sitementioning

confidence: 99%

The role of mass-transport deposits and turbidites in shaping modern lacustrine deepwater channels

Corella

Loizeau

Kremer

et al. 2016

Marine and Petroleum Geology

View full text Add to dashboard Cite

show abstract

“…The low resolution in the data makes it di⁄cult to assess the degree of vertical and lateral channel stacking in each case, apart from noting that the channels have occupied different positions during fan growth. Most likely the channels are to be classi¢ed as aggradational and a low gradient would also imply likely high sinuosity of the channel path (Clark et al, 1992). The low relief of the smaller modern channel near the base of the Lomonosov Ridge may re£ect its relative youthfulness.…”

Section: A Submarine Fan In the Amundsen Basinmentioning

confidence: 99%

A submarine fan in the Amundsen Basin, Arctic Ocean

et al. 2004

View full text Add to dashboard Cite

Seismic reflection data from drifting ice stations and an icebreaker survey document the presence of a submarine fan along the east flank of the Lomonosov Ridge in the Amundsen Basin, Arctic Ocean. The fan extends from a source area at the North Greenland and Canadian Arctic continental margin to the North Pole. The fan probably developed in response to the combined effect of increased glacial sediment input during the Plio^Pleistocene and topographically confined transport of glacial debris in the deep sea passage between Lincoln Sea margin and the southern end of the Lomonosov Ridge. ß

show abstract

“…Levee heights in B and C are not intended to be drawn to scale; levee growth is contemporaneous with sediment gravity flows transiting channel axes; channel-fill strata are omitted for clarity. Figure modified from Clark and Pickering (1996) and Weimer and Slatt (2007); see also Stow and Mayall (2000).…”

Section: Interpretations and Discussiondeep-water Canyons And Associamentioning

confidence: 99%

Deep-water canyons and sequence-stratigraphic framework of the Upper Jurassic Naknek Formation, south-central Alaska

Herriott¹,

Wartes²,

Decker³

2017

View full text Add to dashboard Cite

Front cover. Oblique aerial view southeastward of Chisik Island summit area. This mountain-scale exposure of Naknek Formation exhibits evidence of a Late Jurassic deep-water canyon incised into slope strata of Snug Harbor Siltstone Member (gray-brown, wedge-shaped succession at left of exposure) and ultimately backfilled with basin-floor sandstones of the Pomeroy Arkose Member (at and below the summit ridge). Stratigraphic studies of the Naknek Formation along the ~80-km-long Iniskin-Tuxedni bays outcrop belt led to the recognition of three deep-water paleocanyons. These discoveries and related work permit the first sequence-stratigraphic interpretation for the Naknek Formation in the hydrocarbon-bearing Cook Inlet forearc basin. See figures 4 and 17A for photogeologic rendition and sequence-stratigraphic interpretation, respectively, of this Chisik Island locality. This part of the exposure is ~275 m tall, for sense of scale. Photograph by T.M. Herriott.

show abstract

Quantitative analysis of the geometry of submarine channels: Implications for the classification of submarine fans

Cited by 157 publications

References 0 publications

The role of mass-transport deposits and turbidites in shaping modern lacustrine deepwater channels

The role of mass-transport deposits and turbidites in shaping modern lacustrine deepwater channels

A submarine fan in the Amundsen Basin, Arctic Ocean

Deep-water canyons and sequence-stratigraphic framework of the Upper Jurassic Naknek Formation, south-central Alaska

Contact Info

Product

Resources

About