Upper Miocene to Quaternary unidirectionally migrating deep-water channels in the Pearl River Mouth Basin, northern South China Sea

Gong, Chenglin; Wang, Yingmin; Zhu, Weilin; Li, Weiguo; Xu, Qiang

doi:10.1306/07121211159

Cited by 108 publications

(91 citation statements)

References 56 publications

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“…Downslope seismic facies, which are orientated roughly perpendicular to isobaths and developed on continental slopes, are commonly interpreted to be deep-water channels (e.g., Wynn et al, 2007;Gong et al, 2013;Janocko et al, 2013).…”

Section: Downslope Seismic Facies: Unidirectionally Migrating Deep-wamentioning

confidence: 99%

“…forming unidirectionally migrating deep-water channels (see Gong et al, 2013Gong et al, , 2016 for a detailed interpretation). (Fig.…”

Section: Downslope Seismic Facies: Unidirectionally Migrating Deep-wamentioning

confidence: 99%

“…8 to 11). Gong et al (2013Gong et al ( , 2016 have also attributed the long term unidirectional migration of deep-water turbidite channels, as recorded by downslope seismic facies, to the interaction of downslope gravity currents with contour currents that have predominantly unidirectional flow conditions.…”

Section: Downslope Seismic Facies: Unidirectionally Migrating Deep-wamentioning

confidence: 99%

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Flow processes and sedimentation in contourite channels on the northwestern South China Sea margin: A joint 3D seismic and oceanographic perspective

et al. 2017

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Section: Downslope Seismic Facies: Unidirectionally Migrating Deep-wamentioning

confidence: 99%

“…forming unidirectionally migrating deep-water channels (see Gong et al, 2013Gong et al, , 2016 for a detailed interpretation). (Fig.…”

Section: Downslope Seismic Facies: Unidirectionally Migrating Deep-wamentioning

confidence: 99%

Section: Downslope Seismic Facies: Unidirectionally Migrating Deep-wamentioning

confidence: 99%

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Flow processes and sedimentation in contourite channels on the northwestern South China Sea margin: A joint 3D seismic and oceanographic perspective

et al. 2017

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“…1c). These canyons are nearly N-S orientated and well-confined to the deep-water continental slope where water depth ranges from 300 to 2000 m. The interest of these slope-confined canyons is their depositional architecture and special characteristic of unidirectional migration (Zhu et al 2010;Gong et al 2013;Li et al 2013;Zhou et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Slope-confined submarine canyons in the Baiyun deep-water area, northern South China Sea: variation in their modern morphology

Zhou

et al. 2016

Mar Geophys Res

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On the basis of newly collected multibeam bathymetric data, chirp profiles and existing seismic data, we presented a detailed morphological interpretation of a series of slope-confined canyons in water depths of 300-2000 m in the Baiyun deep-water area, northern margin of the South China Sea. Although these canyons are commonly characterized by regular spacing and a straightline shape, they vary in their lengths, starting and ending water depths, canyon relief, slope gradients, wall slope gradients and depth profiles along the axis. The eastern canyons (C1-C8) have complex surface features, low values in their slope gradient, canyon relief and wall slope gradient and high values in their length and starting and ending depth contrasting to the western ones (C9-C17). From the bathymetric data and chirp profiles, we interpret two main processes that have controlled the morphology and evolution of the canyons: axial incision and landsliding. The western part of the shelf margin where there were at least four stages of submerged reefs differs from the eastern part of the shelf margin where sedimentary undulations occurred at a water depth of *650 m. We consider that the variation in morphology of submarine canyons in the study area is the result of multiple causes, with the leading cause being the difference in stability of the upper slope which is related to the submerged reefs and sedimentary undulations.

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“…Apesar dos sedimentos arenosos predominantes neste tipo de feição serem rapidamente transportados devido a inconsolidação do substrato, as sand waves configuram um sistema deposicional heterogêneo em relação ao período de formação, onde a modificação temporal dos eventos declina-se aos processos dinâmicos locais (Kuijpers and Nielsen, 2016;Zhang et al, 2016). A permanência de uma forçante atuando de forma contínua durante um longo intervalo de tempo, como a ação das correntes de maré predominantemente de vazante neste trecho da Baía de Macapá, pode ter originado as feições com respectivo arranjo de refletores identificados em subsuperfície (GomezVelez et al, 2015;Gong et al, 2013).…”

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Caracterização Das Principais Feições Superficiais De Fundo E Em Subsuperfície No Limite Sudoeste Da Baía De Macapá, Canal Do Norte, Rio Amazonas

2017

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RESUMO.A Baía de Macapá, por estar inserida a zona de médio estuário do Rio Amazonas, apresenta vestígios de alterações morfológicas diferenciadas pela forte dinâmica em um curto intervalo de tempo. O reflexo de tais alterações pode ser observado nas modificações morfoestruturais presentes no leito e subsuperfície. A análise dos perfis sísmicos em alta resolução pelo intervalo de frequência de 0,7 kHz a 12,0 kHz revela que as características apresentadas nas formas de fundo desencadeiam os processos modeladores do padrão de reflexão observados nos refletores em subsuperfície. Através desta relação foi possível identificar a predominância de cinco formas de fundo, quatro unidades estruturais e cinco sismofácies com o destaque para a identificação de uma feição de paleocanal. Observou-se que as variações morfológicas do leito são influenciadas pela constante atuação dos processos hidrodinâmicos e sedimentares ocorrentes periodicamente e vice-versa, corroborando para correlação entre as feições superficiais de fundo e as feições em subsuperfície.Palavras-Chave: Morfologia, formas de fundo, sismofácies, paleocanal.ABSTRACT. The Macapá Bay, because it is inserted in the middle estuary zone of the Amazon River, presents evidences of different changes in a short time. The reflex of such changes can be observed in morphostructural modifications present in the bed and subsurfaces. The analysis of the high-resolution seismic profiles through on frequency range of 0.7 kHz to 12.0 kHz reveals that the features presented in the bedforms trigger the reflection pattern modelers processes observed in the subsurface reflectors. Through this relationship, it was possible to identify the predominance of five bedforms, four structural units and five seismic facies with highlight for the identification of a paleochannel feature. It was observed that the morphological variations of the bed are influenced by the constant actuation of the hydrodynamic processes and sedimentary that occur periodically and vice versa, corroborating to correlation between the superficial bottom features and the subsurface features.

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Upper Miocene to Quaternary unidirectionally migrating deep-water channels in the Pearl River Mouth Basin, northern South China Sea

Cited by 108 publications

References 56 publications

Flow processes and sedimentation in contourite channels on the northwestern South China Sea margin: A joint 3D seismic and oceanographic perspective

Flow processes and sedimentation in contourite channels on the northwestern South China Sea margin: A joint 3D seismic and oceanographic perspective

Slope-confined submarine canyons in the Baiyun deep-water area, northern South China Sea: variation in their modern morphology

Caracterização Das Principais Feições Superficiais De Fundo E Em Subsuperfície No Limite Sudoeste Da Baía De Macapá, Canal Do Norte, Rio Amazonas

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