Seismic stratigraphy and development of Avon canyon in Benin (Dahomey) basin, southwestern Nigeria

Olabode, Solomon O.; Adekoya, J. A.

doi:10.1016/j.jafrearsci.2007.10.002

Cited by 31 publications

(17 citation statements)

References 38 publications

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“…This interpretation is supported by the erosional character of these surfaces that are locally irregular, curved and undulating (e.g. McHargue and Webb, 1986;Bertoni and Cartwright, 2003;Olabode and Adekoya, 2008) and by their valley-like morphology, U to V-shaped in cross section, globally elongated NW-SE and sloping basinward to the south-east (Fig. 8).…”

Section: Submarine Canyonsmentioning

confidence: 83%

Evidence for pre-Messinian submarine canyons on the Gulf of Lions slope (Western Mediterranean)

Lofi

Berné

2008

Marine and Petroleum Geology

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International audienceOn the Gulf of Lions margin, the Messinian Salinity Crisis (MSC) event led to a significant and widespread erosion of the Miocene shelf and slope. It is thus difficult nowadays to restore the morphology of the margin at the beginning of the crisis, and to study the Middle-Upper Miocene series rarely preserved from erosion. In this study, thanks to the use of multichannel seismic reflection data from the Gulf of Lions western slope, it has been possible to image the Miocene slope deposits. Interpretation of the data reveals several diachronic sediment bodies just beneath the Miocene/Pliocene boundary. These bodies are related to slope erosional-depositional complexes, underlain by erosional unconformities outlined by seismic reflector truncations. They are V- or U-shaped in cross section. Over their mapped extent, these bodies are typically 8-12 km wide and incise up to 600 ms TWTT into the Miocene slope deposits. in plan view, they are roughly elongated NW-SE, perpendicularly to the present day shelf break, and they progressively migrate towards the South-East. We interpret these seismic bodies as buried Miocene submarine canyons pre-dating the dramatic drawdown related to the MSC. In this study we try to constrain their age, and we discuss the events that may be at their origin. We also discuss the long-term impact of these slope canyons on the evolution of the margin

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Section: Submarine Canyonsmentioning

confidence: 83%

Evidence for pre-Messinian submarine canyons on the Gulf of Lions slope (Western Mediterranean)

Lofi

Berné

2008

Marine and Petroleum Geology

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“…We propose that they accumulated from sediments transported via the Pearl River Canyon. Compared with typical deep-sea fans that form at canyon mouths on passive margins, such as the Avon fan near the Niger Delta (Olabode and Adekoya 2008), or the Zaire deep-sea fan at the end of the Zaire Canyon (Babonneau et al 2002), the fan of the Pearl River Canyon is relatively small in scale. We suggest that most of the terrigenous sediments transported through the Pearl River Canyon have been captured by the Baiyun Sag.…”

Section: Middle Reachmentioning

confidence: 94%

Morphotectonics and evolutionary controls on the Pearl River Canyon system, South China Sea

Ding

Li³

et al. 2013

Mar Geophys Res

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The Pearl River Canyon system is a typical canyon system on the northern continental slope of the South China Sea, which has significant implications for hydrocarbon exploration. Through swath bathymetry in the canyon area combined with different types of seismic data, we have studied the morphotectonics and controlling factors of the canyon by analyzing its morphology and sedimentary structure, as well as the main features of the continental slope around the canyon. Results show that the Pearl River Canyon can be separated into three segments with different orientations. The upper reach is NW-oriented with a shallowly incised course, whereas the middle and lower reaches, that are located mainly in the Baiyun Sag, have a broad U-shape and have experienced consistent deposition. Seventeen deeply-cut canyons have developed in the slope north of the Baiyun Sag, playing an important role in the sedimentary processes of the middle and lower reaches of the Pearl River Canyon. These canyons display both asymmetrical V-and U-shapes along their lengths. Numerous buried channels can be identified below the modern canyons with unidirectionally migrating stacking patterns, suggesting that the canyons have experienced a cyclic evolution with several cut and fill phases of varying magnitude. These long established canyons, rather than the upper reach of the Pearl River Canyon, are the main conduits for the transport of terrigenous materials to the lower slope and abyssal basin during lowstand stage, and have contributed to the formation of vertically stacked deep-water fans in the middle reach. Canyon morphology is interpreted as a result of erosive sediment flows. The Pearl River Canyon and the 17 canyons in the slope area north of the Baiyun Sag probably have developed since the Miocene. Cenozoic tectonics, sea level change and sediment supply jointly control the morphology and sedimentary structure. The middle and lower reaches of the Pearl River Canyon developed on the paleo-terrain of the Baiyun Sag, which has been a persistently rapid depositional environment, receiving most of the materials transported via the canyons.

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“…Litho-stratigraphically, Abeokuta group comprises of grits, arkosic sandstone, siltstone and clay with occasional conglomerate of predominantly arenaceous materials. [4] The clay in the area is mainly residual clay, deposited over the basement complex rocks of the project area. The residual clay was formed by surface weathering, which gives rise to clay by the chemical decomposition of the rocks, containing silica and alumina.…”

Section: Description Of the Study Areamentioning

confidence: 99%

“…In the desire to have a good design and construction of foundation of future civil engineering structures in order to minimize adverse effects and prevention of post construction problems, some general studies have been carried out on geotechnical properties of the sub-soils [4]. To obtain relevant data inputs for the design and construction of foundations for proposed structures, it is important that construction site be geo-technically characterized carrying out sub-soil investigation.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Sub-Soil Geotechnical Properties for Shallow Foundation and Pavement Design in LASPOTECH, Ikorodu Campus, Lagos State, Nigeria

A¹,

A²,

O³

et al. 2014

IOSRJMCE

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Seismic stratigraphy and development of Avon canyon in Benin (Dahomey) basin, southwestern Nigeria

Cited by 31 publications

References 38 publications

Evidence for pre-Messinian submarine canyons on the Gulf of Lions slope (Western Mediterranean)

Evidence for pre-Messinian submarine canyons on the Gulf of Lions slope (Western Mediterranean)

Morphotectonics and evolutionary controls on the Pearl River Canyon system, South China Sea

Evaluation of Sub-Soil Geotechnical Properties for Shallow Foundation and Pavement Design in LASPOTECH, Ikorodu Campus, Lagos State, Nigeria

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