S. Benetti | University of Ulster (original) (raw)

Papers by S. Benetti

Research paper thumbnail of Glacial dynamics of the West Antarctic Ice Sheet in the southern Bellingshausen Sea during the last glacial cycle

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Research paper thumbnail of Deep-water geomorphology of the glaciated Irish margin from high-resolution marine geophysical data

Marine Geology, 2012

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Research paper thumbnail of Clay mineral provenance of sediments in the southern Bellingshausen Sea reveals drainage changes of the West Antarctic Ice Sheet during the Late Quaternary

Marine Geology, 2009

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Research paper thumbnail of Glacial and post-glacial sedimentary processes in the Irish Rockall Trough from an integrated acoustic analysis of near-seabed sediments

Geo-Marine Letters, 2013

ABSTRACT Near-seabed (<50 m) sediments were studied throughout the Irish sector of the... more ABSTRACT Near-seabed (<50 m) sediments were studied throughout the Irish sector of the Rockall Trough (ca. 123,000 km2) based on a combined analysis of shallow seismic (3.5 kHz) and multibeam swath data acquired by the Irish National Seabed Survey and reprocessed here at higher resolution. The detailed identification of seven acoustic facies served to classify the Rockall Trough into six main sedimentary provinces, incorporating the well-known Feni Drift, Donegal-Barra Fan and Rockall Bank mass flow. In the northern part of the study area, extensive mass transport deposits from both flanks of the trough are the dominant depositional features. Debris flow deposits formed by ice streaming of the British-Irish ice sheet characterise most of the Donegal-Barra Fan, whereas turbidite deposition occurs towards the toe of the fan. On the western margin of the trough, the post-glacial Rockall Bank mass flow deposit displays a rough topography with no acoustic penetration. Several failure scarps are visible on the flank of the bank where the mass flow originated, and pass downslope into large sediment lobes and smaller debris flow deposits. Smaller-scale mass transport deposits were also discovered close to some canyons indenting the eastern slope. High seismic penetration characterises the Feni contourite drift deposit, and precise mapping of its geographical extent shows that it is considerably wider than previously reported. The sediment waves that drape this drift are interpreted as predominantly relict features, and their varied geometry suggests a complex oceanographic regime. In the deeper part of the trough, the data reveal novel evidence of the widespread occurrence (about 12,000 km2) of distinct seismic and backscatter signatures indicating the possible presence of fluid escape structures within fine-grained sediments of mixed contouritic, hemipelagic and turbiditic origin. Sediment overloading and increased pore pressure resulting from extensive mass wasting to the north of the area is a likely cause of dewatering-rooted fluid migration towards the seabed, but further investigations are required to confirm the nature and origin of such fluids in the Rockall Trough.

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Research paper thumbnail of Geomorphology of the Irish Rockall Trough, North Atlantic Ocean, mapped from multibeam bathymetric and backscatter Data

Journal of Maps, 2011

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Research paper thumbnail of Glacial and post-glacial sedimentary processes in the Irish Rockall Trough from an integrated acoustic analysis of near-seabed sediments

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Research paper thumbnail of Mapping Ireland's Glaciated Continental Margin Using Marine Geophysical Data

Developments in Earth Surface Processes, 2011

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Research paper thumbnail of Uncovering the glacial history of the Irish continental shelf

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Research paper thumbnail of The extent and timing of the last British-Irish Ice Sheet offshore of west Ireland-preliminary findings

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Research paper thumbnail of Using Multibeam Echo-Sounder Data to Identify Shipwreck Sites: archaeological assessment of the Joint Irish Bathymetric Survey data

International Journal of Nautical Archaeology, 2011

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Research paper thumbnail of Marine geophysical evidence for Late Pleistocene ice sheet extent and recession off northwest Ireland

Quaternary Science Reviews, 2012

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Research paper thumbnail of The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary

Quaternary Science Reviews, 2010

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Research paper thumbnail of A major trough-mouth fan on the continental margin of the Bellingshausen Sea, West Antarctica: The Belgica Fan

Marine Geology, 2008

A 330-km length of the little known continental shelf edge and slope of the Bellingshausen Sea, W... more A 330-km length of the little known continental shelf edge and slope of the Bellingshausen Sea, West Antarctica, is investigated using multibeam swath-bathymetric and sub-bottom profiler evidence. The shelf break is at 650–700 m across the 150-km wide Belgica Trough, and to either side is about 500 m. When full-glacial ice advanced across the shelf to reach the shelf break, it was

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Research paper thumbnail of Glacial and glacially-related features on the continental margin of northwest Ireland mapped from marine geophysical data

Journal of Maps, 2010

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Research paper thumbnail of Bedforms on the northwest Irish Shelf: indication of modern active sediment transport and over printing of paleo-glacial sedimentary deposits

Journal of Maps, 2014

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Research paper thumbnail of Late Quaternary glacially influenced sedimentation on the north-west Irish margin: facies, sediment delivery and link to glacial history

This presentation will discuss the sedimentary processes that took place since the last glaciatio... more This presentation will discuss the sedimentary processes that took place since the last glaciation on the north-eastern margin of the Rockall Trough, offshore Ireland. With the use of seventeen sediment cores collected along the axes of two major canyons and across the northern Rockall Trough, changes in sedimentary processes from shelf edge to basin floor are revealed and examined. The aim is to better understand the sedimentary processes that occurred along the canyons and in the trough during the last glaciation, through the deglaciation and into the Holocene. On the basis of sedimentary structures, texture, grain size, X-radiograph character and physical properties thirteen depositional facies are recognised. These facies are interpreted in terms of depositional processes as: (1) Massive diamicton deposited as subglacial till on the continental shelf during the last glacial advance; (2) Fining upward gravels and sands, related to rise in sea level and changing of hydrographic co...

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Research paper thumbnail of The Irish Seabed Mapping Programme: INFOMAR - Integrated Mapping Survey for the Sustainable Developments of Ireland's Marine Resources. Progress to Date

During the last six years, the Geological Survey of Ireland and the Marine Institute of Ireland w... more During the last six years, the Geological Survey of Ireland and the Marine Institute of Ireland worked together on the multimillion Irish National Seabed Survey project with the purpose of mapping the Irish marine territory using a suite of remote sensing equipment, from multibeam to seismic, achieving 87% coverage of the marine zone. Ireland was the first country in the world to carry out an extensive mapping project of their extended Exclusive Economic Zone. The Irish National Seabed Survey is now succeeded by the multiyear INFOMAR Programme. INFOMAR will concentrate initially on mapping twenty-six selected priority bays, three sea areas and the fisheries-protection "Biologically Sensitive Area", and then will complete 100% mapping of the remainder of the EEZ. Designed to incorporate all elements of an integrated mapping programme, the key data acquisition will include hydrography, oceanographic, geological and heritage data. These data sets discharge Ireland's oblig...

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Research paper thumbnail of Glacial and post-glacial sedimentary processes in the Irish Rockall Trough from an integrated acoustic analysis of near-seabed sediments

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Deep-water geomorphology of the glaciated Irish margin from high-resolution marine geophysical data

Marine Geology, 2012

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Research paper thumbnail of Geomorphology of the Irish Rockall Trough, North Atlantic Ocean, mapped from multibeam bathymetric and backscatter data

Journal of Maps

Multibeam echosounder data collected by the Irish National Seabed Survey (INSS) between 2000 and ... more Multibeam echosounder data collected by the Irish National Seabed Survey (INSS) between 2000 and 2001 in the Rockall Trough have been used by many projects to analyze the geomorphology and the sedimentary processes of the margins of the Trough. However, due to the low spatial resolution of 150-250 m and the amount of artefacts still embedded in the publicly available data, many geomorphological features have been overlooked. This paper shows that the same multibeam dataset can provide more detailed information on seabed processes when the latest hydrographic and backscatter post-processing techniques are used to reduce data artefacts and improve data quality and spatial resolution. The resulting map, presented here at a scale of 1:450,000, is based on a semi-automatic and manual interpretation of geomorphological features highlighted using a new and improved 30 m bathymetric grid and a multibeam backscatter mosaic obtained using the GEOCODER post-processing algorithm. Overall, the m...

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Research paper thumbnail of Glacial dynamics of the West Antarctic Ice Sheet in the southern Bellingshausen Sea during the last glacial cycle

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Deep-water geomorphology of the glaciated Irish margin from high-resolution marine geophysical data

Marine Geology, 2012

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Clay mineral provenance of sediments in the southern Bellingshausen Sea reveals drainage changes of the West Antarctic Ice Sheet during the Late Quaternary

Marine Geology, 2009

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Glacial and post-glacial sedimentary processes in the Irish Rockall Trough from an integrated acoustic analysis of near-seabed sediments

Geo-Marine Letters, 2013

ABSTRACT Near-seabed (<50 m) sediments were studied throughout the Irish sector of the... more ABSTRACT Near-seabed (<50 m) sediments were studied throughout the Irish sector of the Rockall Trough (ca. 123,000 km2) based on a combined analysis of shallow seismic (3.5 kHz) and multibeam swath data acquired by the Irish National Seabed Survey and reprocessed here at higher resolution. The detailed identification of seven acoustic facies served to classify the Rockall Trough into six main sedimentary provinces, incorporating the well-known Feni Drift, Donegal-Barra Fan and Rockall Bank mass flow. In the northern part of the study area, extensive mass transport deposits from both flanks of the trough are the dominant depositional features. Debris flow deposits formed by ice streaming of the British-Irish ice sheet characterise most of the Donegal-Barra Fan, whereas turbidite deposition occurs towards the toe of the fan. On the western margin of the trough, the post-glacial Rockall Bank mass flow deposit displays a rough topography with no acoustic penetration. Several failure scarps are visible on the flank of the bank where the mass flow originated, and pass downslope into large sediment lobes and smaller debris flow deposits. Smaller-scale mass transport deposits were also discovered close to some canyons indenting the eastern slope. High seismic penetration characterises the Feni contourite drift deposit, and precise mapping of its geographical extent shows that it is considerably wider than previously reported. The sediment waves that drape this drift are interpreted as predominantly relict features, and their varied geometry suggests a complex oceanographic regime. In the deeper part of the trough, the data reveal novel evidence of the widespread occurrence (about 12,000 km2) of distinct seismic and backscatter signatures indicating the possible presence of fluid escape structures within fine-grained sediments of mixed contouritic, hemipelagic and turbiditic origin. Sediment overloading and increased pore pressure resulting from extensive mass wasting to the north of the area is a likely cause of dewatering-rooted fluid migration towards the seabed, but further investigations are required to confirm the nature and origin of such fluids in the Rockall Trough.

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Research paper thumbnail of Geomorphology of the Irish Rockall Trough, North Atlantic Ocean, mapped from multibeam bathymetric and backscatter Data

Journal of Maps, 2011

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Research paper thumbnail of Glacial and post-glacial sedimentary processes in the Irish Rockall Trough from an integrated acoustic analysis of near-seabed sediments

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Mapping Ireland's Glaciated Continental Margin Using Marine Geophysical Data

Developments in Earth Surface Processes, 2011

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Research paper thumbnail of Uncovering the glacial history of the Irish continental shelf

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The extent and timing of the last British-Irish Ice Sheet offshore of west Ireland-preliminary findings

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Using Multibeam Echo-Sounder Data to Identify Shipwreck Sites: archaeological assessment of the Joint Irish Bathymetric Survey data

International Journal of Nautical Archaeology, 2011

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Marine geophysical evidence for Late Pleistocene ice sheet extent and recession off northwest Ireland

Quaternary Science Reviews, 2012

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary

Quaternary Science Reviews, 2010

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A major trough-mouth fan on the continental margin of the Bellingshausen Sea, West Antarctica: The Belgica Fan

Marine Geology, 2008

A 330-km length of the little known continental shelf edge and slope of the Bellingshausen Sea, W... more A 330-km length of the little known continental shelf edge and slope of the Bellingshausen Sea, West Antarctica, is investigated using multibeam swath-bathymetric and sub-bottom profiler evidence. The shelf break is at 650–700 m across the 150-km wide Belgica Trough, and to either side is about 500 m. When full-glacial ice advanced across the shelf to reach the shelf break, it was

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Glacial and glacially-related features on the continental margin of northwest Ireland mapped from marine geophysical data

Journal of Maps, 2010

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Research paper thumbnail of Bedforms on the northwest Irish Shelf: indication of modern active sediment transport and over printing of paleo-glacial sedimentary deposits

Journal of Maps, 2014

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Research paper thumbnail of Late Quaternary glacially influenced sedimentation on the north-west Irish margin: facies, sediment delivery and link to glacial history

This presentation will discuss the sedimentary processes that took place since the last glaciatio... more This presentation will discuss the sedimentary processes that took place since the last glaciation on the north-eastern margin of the Rockall Trough, offshore Ireland. With the use of seventeen sediment cores collected along the axes of two major canyons and across the northern Rockall Trough, changes in sedimentary processes from shelf edge to basin floor are revealed and examined. The aim is to better understand the sedimentary processes that occurred along the canyons and in the trough during the last glaciation, through the deglaciation and into the Holocene. On the basis of sedimentary structures, texture, grain size, X-radiograph character and physical properties thirteen depositional facies are recognised. These facies are interpreted in terms of depositional processes as: (1) Massive diamicton deposited as subglacial till on the continental shelf during the last glacial advance; (2) Fining upward gravels and sands, related to rise in sea level and changing of hydrographic co...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Irish Seabed Mapping Programme: INFOMAR - Integrated Mapping Survey for the Sustainable Developments of Ireland's Marine Resources. Progress to Date

During the last six years, the Geological Survey of Ireland and the Marine Institute of Ireland w... more During the last six years, the Geological Survey of Ireland and the Marine Institute of Ireland worked together on the multimillion Irish National Seabed Survey project with the purpose of mapping the Irish marine territory using a suite of remote sensing equipment, from multibeam to seismic, achieving 87% coverage of the marine zone. Ireland was the first country in the world to carry out an extensive mapping project of their extended Exclusive Economic Zone. The Irish National Seabed Survey is now succeeded by the multiyear INFOMAR Programme. INFOMAR will concentrate initially on mapping twenty-six selected priority bays, three sea areas and the fisheries-protection "Biologically Sensitive Area", and then will complete 100% mapping of the remainder of the EEZ. Designed to incorporate all elements of an integrated mapping programme, the key data acquisition will include hydrography, oceanographic, geological and heritage data. These data sets discharge Ireland's oblig...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Glacial and post-glacial sedimentary processes in the Irish Rockall Trough from an integrated acoustic analysis of near-seabed sediments

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Deep-water geomorphology of the glaciated Irish margin from high-resolution marine geophysical data

Marine Geology, 2012

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Geomorphology of the Irish Rockall Trough, North Atlantic Ocean, mapped from multibeam bathymetric and backscatter data

Journal of Maps

Multibeam echosounder data collected by the Irish National Seabed Survey (INSS) between 2000 and ... more Multibeam echosounder data collected by the Irish National Seabed Survey (INSS) between 2000 and 2001 in the Rockall Trough have been used by many projects to analyze the geomorphology and the sedimentary processes of the margins of the Trough. However, due to the low spatial resolution of 150-250 m and the amount of artefacts still embedded in the publicly available data, many geomorphological features have been overlooked. This paper shows that the same multibeam dataset can provide more detailed information on seabed processes when the latest hydrographic and backscatter post-processing techniques are used to reduce data artefacts and improve data quality and spatial resolution. The resulting map, presented here at a scale of 1:450,000, is based on a semi-automatic and manual interpretation of geomorphological features highlighted using a new and improved 30 m bathymetric grid and a multibeam backscatter mosaic obtained using the GEOCODER post-processing algorithm. Overall, the m...

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