Fluvially Incised Shelf-Edge Deltas and Linkage to Upper Slope Channels (Central Tertiary Basin, Spitsbergen)

2003 ◽  
pp. 231-266 ◽  
Author(s):  
Donatella Mellere ◽  
Anna Breda ◽  
Ronald Steel
Keyword(s):  
Shelf Edge ◽  
Upper Slope

scholarly journals Submarine landslides on the Great Barrier Reef shelf edge and upper slope: A mechanism for generating tsunamis on the north-east Australian coast?

2016 ◽  
Vol 371 ◽  
pp. 120-129 ◽  
Author(s):  
Jody M. Webster ◽  
Nicholas P.J. George ◽  
Robin J. Beaman ◽  
Jon Hill ◽  
Ángel Puga-Bernabéu ◽  
...  
Keyword(s):  
Great Barrier Reef ◽  
Submarine Landslides ◽  
Shelf Edge ◽  
Barrier Reef ◽  
North East ◽  
The North ◽  
Upper Slope

Shelf-edge delta and reef development on a mixed siliciclastic–carbonate margin, central Great Barrier Reef

2020 ◽  
Vol 90 (10) ◽  
pp. 1286-1304
Author(s):  
James Daniell ◽  
Thomas Manoy ◽  
Robin J. Beaman ◽  
Jody M. Webster ◽  
Ángel Puga-Bernabéu
Keyword(s):  
Great Barrier Reef ◽  
Sea Level ◽  
Late Quaternary ◽  
Shelf Edge ◽  
Barrier Reef ◽  
Bathymetric Data ◽  
Impermeable Barrier ◽  
History Of ◽  
Major Impediment ◽  
Upper Slope

ABSTRACT The Great Barrier Reef (GBR) is the world's largest extant mixed silicilastic–carbonate margin. Previous research on the Great Barrier Reef has suggested that the extensive barrier reef system may act as an impermeable barrier and limit the development of delta systems during lowstands, but sufficient geophysical data to support this hypothesis are lacking. We use dense sparker seismic and sub-bottom profiler data to better understand the structure of a large lobe-shaped feature (∼ 10 km × 10 km) on the shelf edge of the central GBR and the interactions between siliciclastic and carbonate sedimentary systems. Interpreted sparker seismic contains prograding clinoforms and suggest that the lobe-shaped feature was a river-dominated shelf-edge delta. A delta on the shelf edge implies that the presence of an exposed barrier reef was not a major impediment to deposition and that other adjacent lobe-shaped features are also deltaic deposits. The shelf-edge deltas were deposited onto a broad upper-slope terrace that allowed continued progradation and limited incision when sea level fell below the shelf edge. Delta foresets are commonly colonized by coral reefs, but the spatial and temporal relationship between reefs and some deltaic units remains unclear. The presence of multiple shelf-edge deltas that link to previously mapped Burdekin River paleo-channels indicates a complex history of sedimentation, with the Burdekin River delta migrating up to 100 km along the GBR margin during the late Quaternary. Regional bathymetric data suggest that large modern or recent shelf-edge deltas are rare on the GBR and that there was a broad range of sedimentary processes operating along the margin of the GBR during periods of low sea level.

Stratigraphic evolution of the upper slope and shelf edge in the Karoo Basin, South Africa

2009 ◽  
Vol 21 (5) ◽  
pp. 502-527 ◽  
Author(s):  
R. Wild ◽  
S. S. Flint ◽  
D. M. Hodgson
Keyword(s):  
South Africa ◽  
Shelf Edge ◽  
Karoo Basin ◽  
Stratigraphic Evolution ◽  
Upper Slope

Paleocontinental slopes of East Coast Geosyncline (Canadian Atlantic margin)

1977 ◽  
Vol 14 (11) ◽  
pp. 2553-2564 ◽  
Author(s):  
Lewis H. King ◽  
Ian F. Young
Keyword(s):  
Newfoundland And Labrador ◽  
East Coast ◽  
Shelf Edge ◽  
Mass Wasting ◽  
Scotian Shelf ◽  
Grand Banks ◽  
Shelf Slope ◽  
Seismic Reflection Profiles ◽  
Atlantic Margin ◽  
Upper Slope

A study of processed seismic reflection profiles along the eastern Canadian continental margin indicates the occurrence at depth of paleocontinental slopes of Cenozoic–Mesozoic age, generally in the vicinity of the present continental slope. The paleoslopes are of two general types, constructional and destructional, formed respectively by progradational processes and mass wasting. The inclined beds of the progradational sequence (clinoform beds) represent the constructional slopes and were probably formed at times when deposition was simultaneous on the shelf, slope, and rise. Conditions leading to the establishment of a relatively deep shelf edge would favor constructional slope formation and preservation. A relatively shallow shelf edge, common during times of low sea level, would promote cutback at the shelf edge and upper slope and lead to the formation of destructional slopes. The depth of the shelf edge is mainly established by the balance between rates of sedimentation and subsidence in conjunction with the processes arising from variations in sea level.The sequence of constructional and destructional paleocontinental slopes varies widely along the Canadian Atlantic margin. On the western Scotian Shelf adjacent to the LaHave Platform the paleoslopes are mainly destructional and are in proximity, with only fragmental expression of former constructional slopes remaining. On the eastern Scotian Shelf and Grand Banks destructional paleoslopes are widely spaced in section between thick areas of constructional slope development. Paleoslopes along the northeast Newfoundland and Labrador Shelves are mainly constructional. The differences may be related to age of opening of the Atlantic Basin.The type and distribution of paleocontinental slopes along a margin could influence the migration of hydrocarbons from the eugeocline to the miogeocline.

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