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| Main Authors: | , , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2010
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| Online Access: | https://doi.org/10.1594/PANGAEA.811288 |
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| _version_ | 1867168141978632192 |
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| author | Hogan, Kelly A Dowdeswell, Julian A Noormets, R Evans, Jeffrey Ó Cofaigh, Colm Jakobsson, Martin |
| author_facet | Hogan, Kelly A Dowdeswell, Julian A Noormets, R Evans, Jeffrey Ó Cofaigh, Colm Jakobsson, Martin |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | High-resolution geophysical and sediment core data are used to investigate the pattern and dynamics of former ice flow in Kvitøya Trough, northwestern Barents Sea. A new swath-bathymetric dataset identifies three types of submarine landform in the study area (streamlined landforms, meltwater channels and cavities, iceberg scours). Subglacially produced streamlined landforms provide a record of ice flow through Kvitøya Trough during the last glaciation. Flow directions are inferred from the orientations of streamlined landforms (drumlins, crag-and-tail features). Ice flowed northward for at least 135 km from an ice divide at the southern end of Kvitøya Trough. A large channel-cavity system incised into bedrock in the southern trough indicates that subglacial meltwater was present at the former ice-sheet base. Modest landform elongation ratios and a lack of mega-scale glacial lineations suggest that, although ice in Kvitøya Trough was melting at the bed and flowed faster than the likely thin and cold-based ice on adjacent banks, a major ice stream probably did not occupy the trough. Retreat was relatively rapid after 14-13.5 14C kyr B.P. and probably progressed via ice sheet-bed decoupling in response to rising sea level. There is little evidence for still stands during ice retreat or of ice-proximal deglacial sediments. Relict iceberg scours in present-day water depths of more than 350 m in the northern trough indicate that calving was an important mass loss mechanism during retreat. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_811288 |
| institution | PANGAEA |
| language | en |
| publishDate | 2010 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 2) AMS radiocarbon dates from sediment cores obtained during James Clark Ross cruise JR142, Kvitøya Trough Hogan, Kelly A Dowdeswell, Julian A Noormets, R Evans, Jeffrey Ó Cofaigh, Colm Jakobsson, Martin Age, 14C AMS; Age, dated; Age, dated, standard deviation; Age, dated material; Core; DEPTH, sediment/rock; Event label; GC; Gravity corer; International Polar Year (2007-2008); IPY; James Clark Ross; JR142; JR142-GC10; JR142-GC11; JR20060728; Latitude of event; Longitude of event; Svalbard Shelf High-resolution geophysical and sediment core data are used to investigate the pattern and dynamics of former ice flow in Kvitøya Trough, northwestern Barents Sea. A new swath-bathymetric dataset identifies three types of submarine landform in the study area (streamlined landforms, meltwater channels and cavities, iceberg scours). Subglacially produced streamlined landforms provide a record of ice flow through Kvitøya Trough during the last glaciation. Flow directions are inferred from the orientations of streamlined landforms (drumlins, crag-and-tail features). Ice flowed northward for at least 135 km from an ice divide at the southern end of Kvitøya Trough. A large channel-cavity system incised into bedrock in the southern trough indicates that subglacial meltwater was present at the former ice-sheet base. Modest landform elongation ratios and a lack of mega-scale glacial lineations suggest that, although ice in Kvitøya Trough was melting at the bed and flowed faster than the likely thin and cold-based ice on adjacent banks, a major ice stream probably did not occupy the trough. Retreat was relatively rapid after 14-13.5 14C kyr B.P. and probably progressed via ice sheet-bed decoupling in response to rising sea level. There is little evidence for still stands during ice retreat or of ice-proximal deglacial sediments. Relict iceberg scours in present-day water depths of more than 350 m in the northern trough indicate that calving was an important mass loss mechanism during retreat. |
| title | (Table 2) AMS radiocarbon dates from sediment cores obtained during James Clark Ross cruise JR142, Kvitøya Trough |
| topic | Age, 14C AMS; Age, dated; Age, dated, standard deviation; Age, dated material; Core; DEPTH, sediment/rock; Event label; GC; Gravity corer; International Polar Year (2007-2008); IPY; James Clark Ross; JR142; JR142-GC10; JR142-GC11; JR20060728; Latitude of event; Longitude of event; Svalbard Shelf |
| url | https://doi.org/10.1594/PANGAEA.811288 |