Submerged sand ridges on the western continental shelf off Bombay, India: evidence for Late Pleistocene-Holocene sea-level changes

Wagle, B.G.; Veerayya, M.

doi:10.1016/s0025-3227(96)00053-9

Cited by 17 publications

(7 citation statements)

References 24 publications

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“…With respect to the plethora of patterns included in the general definition of "transgressive sand ridges" [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18], the Adriatic deposits more closely resemble the two-fold scheme defined by [16], according to which a distinction is made between sand ridges resulting from transgressive reworking of shelf margin lowstand deposits (i.e., the shelf edge TSR) and sand ridges that are "transgressive in origin" (i.e., the back-stepping mounded deposits). In the Adriatic case, however, the shelf edge TSR are also considered "transgressive in origin", since they distinctively overlay the "transgressed" lowstand deposits, as the result of a later (transgressive) reworking and re-sedimentation process ( Figure 12).…”

Section: Sequence-stratigraphic Implicationsmentioning

confidence: 99%

“…Shelf deposits with overall sandy composition, wedged and/or mounded shape, and along-strike extent over tens of kilometers, are known from ancient and modern continental margins [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. These deposits include sedimentary bodies formed in different environments by different processes; they range in scale from thick (tens of meters) prograding wedges [16,17] to smaller (1-3 m) bedforms [18].…”

Section: Introductionmentioning

confidence: 99%

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Late Pleistocene Post-Glacial Sea Level Rise and Differential Preservation of Transgressive “Sand Ridge” Deposits in the Adriatic Sea

Ridente

2018

Geosciences

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Linear sand bodies with ridged or mounded morphology are commonly referred to as "sand ridges". Their origin may reflect a great variety of depositional processes and environments, although many examples from modern shelves include near-shore transgressive deposits formed during the last post-glacial sea level rise. These transgressive sand ridges, however, are not present on all the margins drowned during this interval, indicating that local environmental factors contribute to their formation and preservation. Transgressive sand ridges are recognized on the South Adriatic shelf in water depths between 90 and 120 m, where they overlay a major unconformity originated during the last glacial sea level fall and lowstand. In contrast, they are absent on the Central Adriatic shelf, where transgressive deposits above the glacial unconformity fill erosional scours without forming relief on the seafloor. The transgressive sand ridges on the South Adriatic shelf appear roughly elongated parallel to the bathymetric contour and are locally as thick as 15-20 m. Core data indicate an overall coarse-grained composition, with a relevant bioclastic component. Their limited distribution reflects the importance of local variation in shelf morphology and sediment sourcing at the onset of sea level rise. In particular, their deposition and preservation are favored in less subsiding shelf sectors characterized by higher gradients and tectonic relief, where transgressive erosion and reworking of pre-existing lowstand deposits is also more efficient.

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Section: Sequence-stratigraphic Implicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Late Pleistocene Post-Glacial Sea Level Rise and Differential Preservation of Transgressive “Sand Ridge” Deposits in the Adriatic Sea

Ridente

2018

Geosciences

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“…Further west, the seafloor falls to about 100 m. The transition area between 60 m (inner shelf) and 100 m (outer shelf) water depth is very narrow and often occupied by limestone, coral fragments and coarse sands (Wagle and Veerayya, 1996). Wagle and Veerayya (1996) and Rao et al (1994) have also reported massive mound structures and several pinnacles of 1 to 6 m high (up to 14 m high in places) comprising algal Halimeda bioherms along a series of NNW-SSE ridges in the SE quadrant of the FFF. The non-skeletal (non-Halimeda) grains on the FFF are largely aragonitic in composition, having smooth and shiny surfaces, rounded to ellipsoidal in shape and are described as oolitic sand (Nair, 1970) or fecal pellets (Rao et al, 1994).…”

Section: The Bombay High and The Fffmentioning

confidence: 99%

An insight into the “Fifty-Fathom-Flat” off India's west coast

et al. 2010

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“…Os sedimentos que provêm do continente por meio dos rios que percorreram estes vales de plataforma, carreando material para zonas mais distantes. A presença dos vales, associado aos influxos de material terrígeno podem ocasionar a criação de outras feições, como os deltas e cristas arenosas ao longo de toda plataforma (Wagle & Veerayya, 1996;Gardner et al, 2007;Weschenfelder et al, 2008;Salzmann et al, 2013).…”

Section: Introductionunclassified

Aspectos Sedimentológicos E Batimétricos Da Plataforma Continental Norte De Pernambuco - Brasil

Melo¹,

Barcellos²,

Oliveira³

et al. 2020

Est. Geol.

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; valdiramaralvazmanso RESUMO O presente trabalho apresenta uma contribuição acerca da fisiografia e da cobertura sedimentar da região de plataforma interna e média adjacente à Ilha de Itamaracá (PE). Esta pesquisa se baseou nos dados obtidos do projeto "Granulados Marinhos-GRANMAR Pernambuco". A partir desta cobertura de dados foram elaborados mapas de batimetria, do tamanho médio das partículas sedimentares, dos aspectos de seleção do sedimento, e dos teores de carbonato de cálcio dos depósitos superficiais. A análise da fisiografia revelou a presença de reentrâncias e depressões associadas às desembocaduras dos rios. Os principais resultados demonstraram que a cobertura sedimentar é predominantemente calcária de origem bioclástica, com granulação arenosa e que a distribuição dos depósitos superficiais é controlada pela associação de aspectos fisiográficos e hidrodinâmicos locais. Os arenitos de praia e canais atuam na energia do meio, o que promove o a seleção dos sedimentos na plataforma. Enquanto que os paleovales e depressões do fundo marinho atuam como elementos de retenção dos sedimentos mais finos oriundos do continente.

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Submerged sand ridges on the western continental shelf off Bombay, India: evidence for Late Pleistocene-Holocene sea-level changes

Cited by 17 publications

References 24 publications

Late Pleistocene Post-Glacial Sea Level Rise and Differential Preservation of Transgressive “Sand Ridge” Deposits in the Adriatic Sea

Late Pleistocene Post-Glacial Sea Level Rise and Differential Preservation of Transgressive “Sand Ridge” Deposits in the Adriatic Sea

An insight into the “Fifty-Fathom-Flat” off India's west coast

Aspectos Sedimentológicos E Batimétricos Da Plataforma Continental Norte De Pernambuco - Brasil

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