Reconsideration of the Richardson Clay with subglacial defoming bed at an outcrop at the northern foot of Mt. Riiser-Larsen, West Enderby Land, East Antarctica
Outcrops bearing clayish stratified sediments at the northern foot of Mt. Riiser-Larsen, West Enderby Land, East Antarctica (named "Richardson Clay" by M. Hayashi, Proc. NIPR Symp. Antarct. Geosci., 4,119,1990) have been observed by several authors of the Japanese Antarctic Research Expedi...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:ff34180e18ad4e1ea523405fc53708e1 2023-05-15T13:36:05+02:00 Reconsideration of the Richardson Clay with subglacial defoming bed at an outcrop at the northern foot of Mt. Riiser-Larsen, West Enderby Land, East Antarctica Kazuomi Hirakawa Takanobu Sawagaki 2000-03-01 https://doi.org/10.15094/00009112 https://doaj.org/article/ff34180e18ad4e1ea523405fc53708e1 en other eng National Institute of Polar Research doi:10.15094/00009112 0085-7289 2432-079X https://doaj.org/article/ff34180e18ad4e1ea523405fc53708e1 undefined Antarctic Record, Vol 44, Iss 1, Pp 25-37 (2000) geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2000 fttriple https://doi.org/10.15094/00009112 2023-01-22T18:19:11Z Outcrops bearing clayish stratified sediments at the northern foot of Mt. Riiser-Larsen, West Enderby Land, East Antarctica (named "Richardson Clay" by M. Hayashi, Proc. NIPR Symp. Antarct. Geosci., 4,119,1990) have been observed by several authors of the Japanese Antarctic Research Expeditions (JAREs). The Richardson Clay occurs as an interbed within a thick layer of angular gravels interpreted as glacial deposits. In a 1-day short visit of JARE-35 to this outcrop, several additional features of the sediments were identified, contributing to reconstruction of the former sub-ice sheet environment and historical change in this region. The most notable points are 1) the Richardson Clay layer has boundary layers between the Richardson Clay and gravel layers above and below it, and 2) these three layers have significant deformed structures. Recent development of the knowledge on subglacial geological processes suggests that these features were affected by glacial motion and glacial erosional, depositional and sedimentary processes. The Richardson Clay appears to consist of glacilacustrine sediments deposited on the bottom of a proglacial lake which appeared between two glacial advances. However, whether these advances were part of a small terminus fluctuation of a major glaciation or two distinct different glaciations has not been evaluated yet. Nevertheless, we provisionally define these layers as the Richardson Till. Consequently, it is strongly recommended that further investigation of these sediments should be conducted to reconstruct the ice sheet fluctuation in this region and to obtain general information for studies on subglacial geological processes. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Enderby Land Ice Sheet Unknown Antarctic East Antarctica Riiser-Larsen ENVELOPE(50.667,50.667,-66.783,-66.783) |
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language |
English |
topic |
geo |
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geo Kazuomi Hirakawa Takanobu Sawagaki Reconsideration of the Richardson Clay with subglacial defoming bed at an outcrop at the northern foot of Mt. Riiser-Larsen, West Enderby Land, East Antarctica |
topic_facet |
geo |
description |
Outcrops bearing clayish stratified sediments at the northern foot of Mt. Riiser-Larsen, West Enderby Land, East Antarctica (named "Richardson Clay" by M. Hayashi, Proc. NIPR Symp. Antarct. Geosci., 4,119,1990) have been observed by several authors of the Japanese Antarctic Research Expeditions (JAREs). The Richardson Clay occurs as an interbed within a thick layer of angular gravels interpreted as glacial deposits. In a 1-day short visit of JARE-35 to this outcrop, several additional features of the sediments were identified, contributing to reconstruction of the former sub-ice sheet environment and historical change in this region. The most notable points are 1) the Richardson Clay layer has boundary layers between the Richardson Clay and gravel layers above and below it, and 2) these three layers have significant deformed structures. Recent development of the knowledge on subglacial geological processes suggests that these features were affected by glacial motion and glacial erosional, depositional and sedimentary processes. The Richardson Clay appears to consist of glacilacustrine sediments deposited on the bottom of a proglacial lake which appeared between two glacial advances. However, whether these advances were part of a small terminus fluctuation of a major glaciation or two distinct different glaciations has not been evaluated yet. Nevertheless, we provisionally define these layers as the Richardson Till. Consequently, it is strongly recommended that further investigation of these sediments should be conducted to reconstruct the ice sheet fluctuation in this region and to obtain general information for studies on subglacial geological processes. |
format |
Article in Journal/Newspaper |
author |
Kazuomi Hirakawa Takanobu Sawagaki |
author_facet |
Kazuomi Hirakawa Takanobu Sawagaki |
author_sort |
Kazuomi Hirakawa |
title |
Reconsideration of the Richardson Clay with subglacial defoming bed at an outcrop at the northern foot of Mt. Riiser-Larsen, West Enderby Land, East Antarctica |
title_short |
Reconsideration of the Richardson Clay with subglacial defoming bed at an outcrop at the northern foot of Mt. Riiser-Larsen, West Enderby Land, East Antarctica |
title_full |
Reconsideration of the Richardson Clay with subglacial defoming bed at an outcrop at the northern foot of Mt. Riiser-Larsen, West Enderby Land, East Antarctica |
title_fullStr |
Reconsideration of the Richardson Clay with subglacial defoming bed at an outcrop at the northern foot of Mt. Riiser-Larsen, West Enderby Land, East Antarctica |
title_full_unstemmed |
Reconsideration of the Richardson Clay with subglacial defoming bed at an outcrop at the northern foot of Mt. Riiser-Larsen, West Enderby Land, East Antarctica |
title_sort |
reconsideration of the richardson clay with subglacial defoming bed at an outcrop at the northern foot of mt. riiser-larsen, west enderby land, east antarctica |
publisher |
National Institute of Polar Research |
publishDate |
2000 |
url |
https://doi.org/10.15094/00009112 https://doaj.org/article/ff34180e18ad4e1ea523405fc53708e1 |
long_lat |
ENVELOPE(50.667,50.667,-66.783,-66.783) |
geographic |
Antarctic East Antarctica Riiser-Larsen |
geographic_facet |
Antarctic East Antarctica Riiser-Larsen |
genre |
Antarc* Antarctic Antarctica East Antarctica Enderby Land Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Enderby Land Ice Sheet |
op_source |
Antarctic Record, Vol 44, Iss 1, Pp 25-37 (2000) |
op_relation |
doi:10.15094/00009112 0085-7289 2432-079X https://doaj.org/article/ff34180e18ad4e1ea523405fc53708e1 |
op_rights |
undefined |
op_doi |
https://doi.org/10.15094/00009112 |
_version_ |
1766074160690233344 |