Grain-size distribution and origins of unconsolidated fine sediments in ice-free areas, Soya Coast, East Dronning Maud Land, East Antarctica
Unconsolidated fine sediments (UFS), sporadically deposited in Soya Coast ice-free areas, have often been described as glacial deposits (till) or subglacial till in previous studies, but their genesis and depositional environments have never been discussed so far. In this study, 95 samples of UFS we...
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ftdoajarticles:oai:doaj.org/article:fc28382944b1442ea877ba8f46c07cd0 2023-05-15T13:45:41+02:00 Grain-size distribution and origins of unconsolidated fine sediments in ice-free areas, Soya Coast, East Dronning Maud Land, East Antarctica Shogo Iwasaki Hideki Miura Hideaki Maemoku 2005-11-01T00:00:00Z https://doi.org/10.15094/00009335 https://doaj.org/article/fc28382944b1442ea877ba8f46c07cd0 EN JA eng jpn National Institute of Polar Research http://doi.org/10.15094/00009335 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00009335 0085-7289 2432-079X https://doaj.org/article/fc28382944b1442ea877ba8f46c07cd0 Antarctic Record, Vol 49, Iss 3, Pp 258-291 (2005) Geography (General) G1-922 article 2005 ftdoajarticles https://doi.org/10.15094/00009335 2022-12-31T08:50:20Z Unconsolidated fine sediments (UFS), sporadically deposited in Soya Coast ice-free areas, have often been described as glacial deposits (till) or subglacial till in previous studies, but their genesis and depositional environments have never been discussed so far. In this study, 95 samples of UFS were analyzed for grain-size distribution, and their properties and origins were examined by contrast with the grain-size distribution of primary subglacial-debris (PSD): debris in basal ice and lodgement tills. Primary subglacial-debris is composed of a very broad range of grain size from clay to sand, and exhibit a typically bimodal frequency distribution with peaks in sand and clay parts. In contrast, some of the UFS covered by gravel or raised beach deposits have the same grain-size distribution with PSD, although almost all UFS consist mainly of clay and/or silt and exhibit various frequency distributions. Therefore, it seems reasonable to conclude that the UFS contains abundant reworked materials from the PSD, which were widely deposited on the Soya Coast formerly ice-free areas. Article in Journal/Newspaper Antarc* Antarctica Dronning Maud Land East Antarctica Directory of Open Access Journals: DOAJ Articles East Antarctica Dronning Maud Land Raised Beach ENVELOPE(163.783,163.783,-74.983,-74.983) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Japanese |
topic |
Geography (General) G1-922 |
spellingShingle |
Geography (General) G1-922 Shogo Iwasaki Hideki Miura Hideaki Maemoku Grain-size distribution and origins of unconsolidated fine sediments in ice-free areas, Soya Coast, East Dronning Maud Land, East Antarctica |
topic_facet |
Geography (General) G1-922 |
description |
Unconsolidated fine sediments (UFS), sporadically deposited in Soya Coast ice-free areas, have often been described as glacial deposits (till) or subglacial till in previous studies, but their genesis and depositional environments have never been discussed so far. In this study, 95 samples of UFS were analyzed for grain-size distribution, and their properties and origins were examined by contrast with the grain-size distribution of primary subglacial-debris (PSD): debris in basal ice and lodgement tills. Primary subglacial-debris is composed of a very broad range of grain size from clay to sand, and exhibit a typically bimodal frequency distribution with peaks in sand and clay parts. In contrast, some of the UFS covered by gravel or raised beach deposits have the same grain-size distribution with PSD, although almost all UFS consist mainly of clay and/or silt and exhibit various frequency distributions. Therefore, it seems reasonable to conclude that the UFS contains abundant reworked materials from the PSD, which were widely deposited on the Soya Coast formerly ice-free areas. |
format |
Article in Journal/Newspaper |
author |
Shogo Iwasaki Hideki Miura Hideaki Maemoku |
author_facet |
Shogo Iwasaki Hideki Miura Hideaki Maemoku |
author_sort |
Shogo Iwasaki |
title |
Grain-size distribution and origins of unconsolidated fine sediments in ice-free areas, Soya Coast, East Dronning Maud Land, East Antarctica |
title_short |
Grain-size distribution and origins of unconsolidated fine sediments in ice-free areas, Soya Coast, East Dronning Maud Land, East Antarctica |
title_full |
Grain-size distribution and origins of unconsolidated fine sediments in ice-free areas, Soya Coast, East Dronning Maud Land, East Antarctica |
title_fullStr |
Grain-size distribution and origins of unconsolidated fine sediments in ice-free areas, Soya Coast, East Dronning Maud Land, East Antarctica |
title_full_unstemmed |
Grain-size distribution and origins of unconsolidated fine sediments in ice-free areas, Soya Coast, East Dronning Maud Land, East Antarctica |
title_sort |
grain-size distribution and origins of unconsolidated fine sediments in ice-free areas, soya coast, east dronning maud land, east antarctica |
publisher |
National Institute of Polar Research |
publishDate |
2005 |
url |
https://doi.org/10.15094/00009335 https://doaj.org/article/fc28382944b1442ea877ba8f46c07cd0 |
long_lat |
ENVELOPE(163.783,163.783,-74.983,-74.983) |
geographic |
East Antarctica Dronning Maud Land Raised Beach |
geographic_facet |
East Antarctica Dronning Maud Land Raised Beach |
genre |
Antarc* Antarctica Dronning Maud Land East Antarctica |
genre_facet |
Antarc* Antarctica Dronning Maud Land East Antarctica |
op_source |
Antarctic Record, Vol 49, Iss 3, Pp 258-291 (2005) |
op_relation |
http://doi.org/10.15094/00009335 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00009335 0085-7289 2432-079X https://doaj.org/article/fc28382944b1442ea877ba8f46c07cd0 |
op_doi |
https://doi.org/10.15094/00009335 |
_version_ |
1766229751795548160 |