Grain shape of sediment from the Weddell Sea
Very fine quartz sand was examined from Paleogene and Neogene sediments of ODP Sites 693, 694, 695, 696, and 697 to determine their grain roundness using Fourier analysis and SEM surface texture characteristics. The objective of this study was to identify grain roundness and surface texture characte...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.753898 2024-09-15T17:48:07+00:00 Grain shape of sediment from the Weddell Sea Smith, C H O'Connell, Suzanne B MEDIAN LATITUDE: -64.986867 * MEDIAN LONGITUDE: -34.036449 * SOUTH-BOUND LATITUDE: -70.832000 * WEST-BOUND LONGITUDE: -43.451600 * NORTH-BOUND LATITUDE: -61.810000 * EAST-BOUND LONGITUDE: -14.573500 * DATE/TIME START: 1987-01-30T09:00:00 * DATE/TIME END: 1987-03-07T13:30:00 1990 application/zip, 6 datasets https://doi.pangaea.de/10.1594/PANGAEA.753898 https://doi.org/10.1594/PANGAEA.753898 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.753898 https://doi.org/10.1594/PANGAEA.753898 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Smith, C H; O'Connell, Suzanne B (1990): Provenance and glacial history of very fine quartz sand from the Weddell Sea, Antarctica. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 89-109, https://doi.org/10.2973/odp.proc.sr.113.149.1990 113-693A 113-693B 113-694B 113-694C 113-695A 113-696A 113-696B 113-697B DRILL Drilling/drill rig Joides Resolution Leg113 Ocean Drilling Program ODP Weddell Sea dataset publication series 1990 ftpangaea https://doi.org/10.1594/PANGAEA.75389810.2973/odp.proc.sr.113.149.1990 2024-07-24T02:31:20Z Very fine quartz sand was examined from Paleogene and Neogene sediments of ODP Sites 693, 694, 695, 696, and 697 to determine their grain roundness using Fourier analysis and SEM surface texture characteristics. The objective of this study was to identify grain roundness and surface texture characteristics unique to East (Site 693) and West (Sites 695, 696, and 697) Antarctica and to glacial regimes. Once identified, these distinguishing features could then be used to determine changes in source area and glacial conditions in the central Weddell Sea Basin (Site 694). Three end members of very fine quartz sand are recognized in the Oligocene to Pleistocene sediments of the Weddell Sea: angular, rounded, and intermediate. End member 1 (angular) consists of extremely angular grains with numerous fracture textures. Previous investigations suggested that these sands are derived from crystalline rocks that fractured during formation or deformation and/or were exposed to weathering by ice. In this study, however, the correlation of angularity with ice activity is problematical as the most angular sands were recovered in the lower Oligocene sediments of the South Orkney Microcontinent, a period of temperate climatic conditions. End member 3 (rounded) consists of rounded grains with chemically and mechanically produced surface textures. These sands are presumed to be derived from the Beacon-type rocks in East Antarctica and the sedimentary deposits of the Northern Antarctic Peninsula. End member 2 (intermediate) grains display crystalline nodes and grain embayments. They are thought to be derived from felsic intrusives, East Antarctic quartzites, basement metamorphics of the South Orkney Microcontinent, and/or the Andean intrusive series of West Antarctica. Unfortunately, no features unique to either the East or West Antarctic sediment sources or to glacial conditions could be isolated. Therefore, the objective of determining provenance changes and sediment erosion and transport mechanisms could not be achieved using ... Other/Unknown Material Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Weddell Sea West Antarctica PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-43.451600,-14.573500,-61.810000,-70.832000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
113-693A 113-693B 113-694B 113-694C 113-695A 113-696A 113-696B 113-697B DRILL Drilling/drill rig Joides Resolution Leg113 Ocean Drilling Program ODP Weddell Sea |
spellingShingle |
113-693A 113-693B 113-694B 113-694C 113-695A 113-696A 113-696B 113-697B DRILL Drilling/drill rig Joides Resolution Leg113 Ocean Drilling Program ODP Weddell Sea Smith, C H O'Connell, Suzanne B Grain shape of sediment from the Weddell Sea |
topic_facet |
113-693A 113-693B 113-694B 113-694C 113-695A 113-696A 113-696B 113-697B DRILL Drilling/drill rig Joides Resolution Leg113 Ocean Drilling Program ODP Weddell Sea |
description |
Very fine quartz sand was examined from Paleogene and Neogene sediments of ODP Sites 693, 694, 695, 696, and 697 to determine their grain roundness using Fourier analysis and SEM surface texture characteristics. The objective of this study was to identify grain roundness and surface texture characteristics unique to East (Site 693) and West (Sites 695, 696, and 697) Antarctica and to glacial regimes. Once identified, these distinguishing features could then be used to determine changes in source area and glacial conditions in the central Weddell Sea Basin (Site 694). Three end members of very fine quartz sand are recognized in the Oligocene to Pleistocene sediments of the Weddell Sea: angular, rounded, and intermediate. End member 1 (angular) consists of extremely angular grains with numerous fracture textures. Previous investigations suggested that these sands are derived from crystalline rocks that fractured during formation or deformation and/or were exposed to weathering by ice. In this study, however, the correlation of angularity with ice activity is problematical as the most angular sands were recovered in the lower Oligocene sediments of the South Orkney Microcontinent, a period of temperate climatic conditions. End member 3 (rounded) consists of rounded grains with chemically and mechanically produced surface textures. These sands are presumed to be derived from the Beacon-type rocks in East Antarctica and the sedimentary deposits of the Northern Antarctic Peninsula. End member 2 (intermediate) grains display crystalline nodes and grain embayments. They are thought to be derived from felsic intrusives, East Antarctic quartzites, basement metamorphics of the South Orkney Microcontinent, and/or the Andean intrusive series of West Antarctica. Unfortunately, no features unique to either the East or West Antarctic sediment sources or to glacial conditions could be isolated. Therefore, the objective of determining provenance changes and sediment erosion and transport mechanisms could not be achieved using ... |
format |
Other/Unknown Material |
author |
Smith, C H O'Connell, Suzanne B |
author_facet |
Smith, C H O'Connell, Suzanne B |
author_sort |
Smith, C H |
title |
Grain shape of sediment from the Weddell Sea |
title_short |
Grain shape of sediment from the Weddell Sea |
title_full |
Grain shape of sediment from the Weddell Sea |
title_fullStr |
Grain shape of sediment from the Weddell Sea |
title_full_unstemmed |
Grain shape of sediment from the Weddell Sea |
title_sort |
grain shape of sediment from the weddell sea |
publisher |
PANGAEA |
publishDate |
1990 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.753898 https://doi.org/10.1594/PANGAEA.753898 |
op_coverage |
MEDIAN LATITUDE: -64.986867 * MEDIAN LONGITUDE: -34.036449 * SOUTH-BOUND LATITUDE: -70.832000 * WEST-BOUND LONGITUDE: -43.451600 * NORTH-BOUND LATITUDE: -61.810000 * EAST-BOUND LONGITUDE: -14.573500 * DATE/TIME START: 1987-01-30T09:00:00 * DATE/TIME END: 1987-03-07T13:30:00 |
long_lat |
ENVELOPE(-43.451600,-14.573500,-61.810000,-70.832000) |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Weddell Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Weddell Sea West Antarctica |
op_source |
Supplement to: Smith, C H; O'Connell, Suzanne B (1990): Provenance and glacial history of very fine quartz sand from the Weddell Sea, Antarctica. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 89-109, https://doi.org/10.2973/odp.proc.sr.113.149.1990 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.753898 https://doi.org/10.1594/PANGAEA.753898 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.75389810.2973/odp.proc.sr.113.149.1990 |
_version_ |
1810289233171054592 |