Sediment Characteristics and Seafloor Topography of a Palimpsest Shelf, Mississippi-Alabama Continental Shelf

Parker, Steven J.; Shultz, A.W.; Schroeder, William W.

doi:10.2110/pec.92.48.0243

Cited by 7 publications

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“…In contrast to the area just south of the Po delta, the North Adriatic basin does not show evidence of widespread and relatively thick backbarrier deposits in the late-Quaternary transgressive record (Colantoni et al 1990;Trincardi et al 1994). By studying the morphology, sediment composition and stratigraphical setting of one of the best developed fields of bedforms in the North Adriatic we have tried to answer two related questions: (Harris, 1989) 102 3.9 20 Skagerrak Sea -Denmark (Kuijpers et al, 1993) 250-600;800-900 3.5-7 20-75 Chesapeake Bay (Perrillo and Ludwick, 1984) 200 2.1 10 Alabama Shelf -USA (Parker, 1992) 500 2 16-22 Long Island Sound -USA (Fenster et al, 1990) 118-300 4-12 35-90 Gironde Estuary-France (Berne et al, 1993) 37-182 1.5-6.7 15-25 Chesapeake Bay-USA (Ludwick, 1972) 60-245 1.5-3.4 3-18 Cook Inlet -Alaska (Bouma et a1.,1980) 100-500 5-9 25-120 North Adriatic Shelf -Italy (Cavaleri and Stefanon, 1980) (1) what was the source of the sand on this sediment-starved epicontinental shelf where lowstand continental deposits are encountered within 1 m below the sea floor? and (2) what are the mechanism and the timing of formation of these unusual bedforms relative to the late-Quaternary sea-level rise?…”

Section: Discussionmentioning

confidence: 99%

Late Quaternary transgressive large dunes on the sediment-starved Adriatic shelf

Correggiari¹,

Field

Trincardi³

1996

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The Adriatic epicontinental basin is a low-gradient shelf where the late-Quaternary transgressive systems tract (TST) is composed of thin parasequences of backbarrier, shoreface and offshore deposits. The facies and internal architecture of the late-Quaternary TST in the Adriatic epicontinental basin changed consistently from early transgression to late transgression reflecting: (1) fluctuations in the balance between sediment supply and accommodation increase, and (2) a progressive intensification of the oceanographic regime, driven by the transgressive widening of the basin to as much as seven times its lowstand extent. One of the consequences of this trend is that high-energy marine bedforms such as sand ridges and sand waves characterize only areas that were flooded close to the end of the late-Quaternary sea-level rise, when the wind fetch was maximum and bigger waves and stronger storm currents could form.We studied the morphology, sediment composition and sequence-stratigraphical setting of a field of asymmetric bedforms (typically 3 m high and 600 m in wavelength) in 20-24 m water depth offshore the Venice Lagoon in the sediment-starved North Adriatic shelf. The sand that forms these large dunes derived from a drowned transgressive coastal deposit reworked by marine processes. Early cementation took place over most of the dune crests limiting their activity and preventing their destruction. Both the formation and deactivation of this field of sand dunes occurred over a short time interval close to the turn-around point that separates the late-Quaternary sea-level rise and the following highstand and reflect rapid changes in the oceanographic regime of the basin.

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Section: Discussionmentioning

confidence: 99%

Late Quaternary transgressive large dunes on the sediment-starved Adriatic shelf

Correggiari¹,

Field

Trincardi³

1996

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“…Goff (2014) uses chirp seismic profiling and sediment cores to characterize underlying Pleistocene fluvial systems and transgressive deposits (barrier/estuarine sands) underlying the ridges. The ridges are oriented perpendicular to the dominant wave direction and parallel to the alongshore current direction (Goff, 2014), their orientation is similar to older ridges that developed earlier in the Holocene and are currently submerged in deeper waters across the GOM mid-shelf (Parker et al, 1992;McBride and Byrnes, 1995). A study by Trowbridge (1995) demonstrates that a significant driver of shoal development is storm-driven alongshore current flow.…”

Section: Discussionmentioning

confidence: 71%

Geologic control on the evolution of the inner shelf morphology offshore of the Mississippi barrier islands, northern Gulf of Mexico, USA

Flocks

Kindinger

Kelso

2015

Continental Shelf Research

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“…The China Sea ( Yang & Sun 1988; Yang 1989) and the northern Gulf of Mexico ( Anderson et al 1992 ; Parker et al 1992 ) offer closer analogues to the northern Australian shelf embayments. These examples are also muddy, more so than the Atlantic continental margin of North America.…”

Section: Discussionmentioning

confidence: 99%

“…These examples are also muddy, more so than the Atlantic continental margin of North America. Likewise, away from the main river estuaries, the highstand sediments are often very thin, with locally palimpsest deposits ( Parker et al 1992 ).…”

Section: Discussionmentioning

confidence: 99%

Late Quaternary stratigraphy and sedimentology of the inner part of southwest Joseph Bonaparte Gulf

Clarke

Ringis

2000

Australian Journal of Earth Sciences

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Joseph Bonaparte Gulf is a large embayment on the northwestern continental margin of Australia. It is approximately 300 km east–west and 120 km north–south with a broad continental shelf to seaward. Maximum width from the southernmost shore of Joseph Bonaparte Gulf to the edge of the continental shelf is 560 km. Several large rivers enter the gulf along its shores. The climate is monsoonal, sub‐humid, and cyclone‐prone during the December–March wet season. A bedrock high (Sahul Rise) rims the shelf margin. The sediments within the gulf are carbonates to seaward, grading into clastics inshore. A seaward‐thinning wedge of highstand muds dominates the sediments of the inner shelf of Joseph Bonaparte Gulf. Mud banks up to 15 m thick have developed inshore. Coarse‐grained sand ridges up to 15 m high are found off the mouth of the Ord River. These overlie an Upper Pleistocene transgressive lag of mixed carbonate and gravelly siliciclastic sand. Four drowned strandlines are present on the inner shelf at depths of 20, 25, 28 and 30 m below datum. These are interpreted as having formed during stillstands in the Late Pleistocene transgression. Older strandlines at great depths are inferred as having formed during the fall in sea‐level following the last highstand. For the most part the Upper Pleistocene–Holocene marine sediments overlie an erosion surface cut into older Pleistocene sediments. Incised valleys cut into this erosion surface are up to 5 km wide and have a relief of at least 20 m. The largest valley is that cut by the Ord River. Upper Pleistocene sediments deposited in the incised valleys include interpreted lowstand fluvial gravels, early transgressive channel sands and floodplain silts, and late transgressive estuarine sands and gravels. Older Pleistocene sediments are inferred to have been deposited before and during the 120 ka highstand (isotope stage 5). They consist of sandy calcarenites deposited in high‐energy tide‐dominated shelf environments. Still older shelf and valley‐fill sediments underlie these. The contrast between the Holocene muddy clastic sediments and the sandy carbonates deposited by the 120 ka highstand suggests that either the climate was more arid in the past, with less fluvial transport, or that mud was more effectively trapped in estuaries, allowing development of carbonate depositional environments inshore.

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Sediment Characteristics and Seafloor Topography of a Palimpsest Shelf, Mississippi-Alabama Continental Shelf

Cited by 7 publications

References 0 publications

Late Quaternary transgressive large dunes on the sediment-starved Adriatic shelf

Late Quaternary transgressive large dunes on the sediment-starved Adriatic shelf

Geologic control on the evolution of the inner shelf morphology offshore of the Mississippi barrier islands, northern Gulf of Mexico, USA

Late Quaternary stratigraphy and sedimentology of the inner part of southwest Joseph Bonaparte Gulf

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