Stepwise consolidation of glacigenic sediments of the Prydz Bay
A series of samples from the five sites drilled across the continental shelf and upper slope in Prydz Bay during ODP Leg 119 were consolidation tested in an oedometer. Preconsolidation stresses increase downcore at Sites 739 and 742 in a stepwise manner, and the steps are interpreted to represent pe...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.757988 2023-05-15T13:42:10+02:00 Stepwise consolidation of glacigenic sediments of the Prydz Bay Solheim, Anders Forsberg, Carl Fredrik Pittenger, Alan MEDIAN LATITUDE: -67.623600 * MEDIAN LONGITUDE: 75.462094 * SOUTH-BOUND LATITUDE: -68.764000 * WEST-BOUND LONGITUDE: 74.690500 * NORTH-BOUND LATITUDE: -66.916000 * EAST-BOUND LONGITUDE: 76.681900 * DATE/TIME START: 1988-01-18T00:00:00 * DATE/TIME END: 1988-02-03T20:00:00 1991-03-04 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.757988 https://doi.org/10.1594/PANGAEA.757988 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.757988 https://doi.org/10.1594/PANGAEA.757988 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Solheim, Anders; Forsberg, Carl Fredrik; Pittenger, Alan (1991): Stepwise consolidation of glacigenic sediments related to the glacial history of Prydz Bay, East Antarctica. In: Barron, J; Larsen, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 119, 169-182, https://doi.org/10.2973/odp.proc.sr.119.187.1991 119-739 119-739C 119-740A 119-741A 119-742 119-742A 119-743A COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg119 Ocean Drilling Program ODP Prydz Bay Dataset 1991 ftpangaea https://doi.org/10.1594/PANGAEA.757988 https://doi.org/10.2973/odp.proc.sr.119.187.1991 2023-01-20T07:32:05Z A series of samples from the five sites drilled across the continental shelf and upper slope in Prydz Bay during ODP Leg 119 were consolidation tested in an oedometer. Preconsolidation stresses increase downcore at Sites 739 and 742 in a stepwise manner, and the steps are interpreted to represent periods of increased action of grounded glaciers covering the entire shelf. By the use of theoretical ice sheet surface profiles giving the range of possible ice thicknesses, sediment loading and subsequent erosion seem to be the most important factor for increasing the overconsolidation ratios, and a total glacial erosion exceeding 1 km is possible. Four separate steps in consolidation, here termed "load events" have been identified. The lowermost load event, 1, is correlated to the onset of glaciations reaching the shelf edge and an early period of extensive glaciations, starting in early Oligocene or possibly earlier. Glacial activity related to the buildup of ice in West Antarctica in the late Miocene is tentatively correlated to load event 2. Event 3 is the trace of relatively extensive glacial erosion probably in the Pliocene, whereas the upper step in preconsolidation stress, load event 4, results from the last glaciation reaching the shelf edge, possibly during the late Weichselian. Correlations to other data related to Antarctic glacial history are, however, hampered by the poor age control of the cored diamictites. Consolidation tests may provide a tool for finding the position for hiatuses and unconformities formed subglacially and obscured by subglacial reworking. Dataset Antarc* Antarctic Antarctica Ice Sheet Prydz Bay West Antarctica PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Prydz Bay West Antarctica ENVELOPE(74.690500,76.681900,-66.916000,-68.764000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
119-739 119-739C 119-740A 119-741A 119-742 119-742A 119-743A COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg119 Ocean Drilling Program ODP Prydz Bay |
spellingShingle |
119-739 119-739C 119-740A 119-741A 119-742 119-742A 119-743A COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg119 Ocean Drilling Program ODP Prydz Bay Solheim, Anders Forsberg, Carl Fredrik Pittenger, Alan Stepwise consolidation of glacigenic sediments of the Prydz Bay |
topic_facet |
119-739 119-739C 119-740A 119-741A 119-742 119-742A 119-743A COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg119 Ocean Drilling Program ODP Prydz Bay |
description |
A series of samples from the five sites drilled across the continental shelf and upper slope in Prydz Bay during ODP Leg 119 were consolidation tested in an oedometer. Preconsolidation stresses increase downcore at Sites 739 and 742 in a stepwise manner, and the steps are interpreted to represent periods of increased action of grounded glaciers covering the entire shelf. By the use of theoretical ice sheet surface profiles giving the range of possible ice thicknesses, sediment loading and subsequent erosion seem to be the most important factor for increasing the overconsolidation ratios, and a total glacial erosion exceeding 1 km is possible. Four separate steps in consolidation, here termed "load events" have been identified. The lowermost load event, 1, is correlated to the onset of glaciations reaching the shelf edge and an early period of extensive glaciations, starting in early Oligocene or possibly earlier. Glacial activity related to the buildup of ice in West Antarctica in the late Miocene is tentatively correlated to load event 2. Event 3 is the trace of relatively extensive glacial erosion probably in the Pliocene, whereas the upper step in preconsolidation stress, load event 4, results from the last glaciation reaching the shelf edge, possibly during the late Weichselian. Correlations to other data related to Antarctic glacial history are, however, hampered by the poor age control of the cored diamictites. Consolidation tests may provide a tool for finding the position for hiatuses and unconformities formed subglacially and obscured by subglacial reworking. |
format |
Dataset |
author |
Solheim, Anders Forsberg, Carl Fredrik Pittenger, Alan |
author_facet |
Solheim, Anders Forsberg, Carl Fredrik Pittenger, Alan |
author_sort |
Solheim, Anders |
title |
Stepwise consolidation of glacigenic sediments of the Prydz Bay |
title_short |
Stepwise consolidation of glacigenic sediments of the Prydz Bay |
title_full |
Stepwise consolidation of glacigenic sediments of the Prydz Bay |
title_fullStr |
Stepwise consolidation of glacigenic sediments of the Prydz Bay |
title_full_unstemmed |
Stepwise consolidation of glacigenic sediments of the Prydz Bay |
title_sort |
stepwise consolidation of glacigenic sediments of the prydz bay |
publisher |
PANGAEA |
publishDate |
1991 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.757988 https://doi.org/10.1594/PANGAEA.757988 |
op_coverage |
MEDIAN LATITUDE: -67.623600 * MEDIAN LONGITUDE: 75.462094 * SOUTH-BOUND LATITUDE: -68.764000 * WEST-BOUND LONGITUDE: 74.690500 * NORTH-BOUND LATITUDE: -66.916000 * EAST-BOUND LONGITUDE: 76.681900 * DATE/TIME START: 1988-01-18T00:00:00 * DATE/TIME END: 1988-02-03T20:00:00 |
long_lat |
ENVELOPE(74.690500,76.681900,-66.916000,-68.764000) |
geographic |
Antarctic Prydz Bay West Antarctica |
geographic_facet |
Antarctic Prydz Bay West Antarctica |
genre |
Antarc* Antarctic Antarctica Ice Sheet Prydz Bay West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Prydz Bay West Antarctica |
op_source |
Supplement to: Solheim, Anders; Forsberg, Carl Fredrik; Pittenger, Alan (1991): Stepwise consolidation of glacigenic sediments related to the glacial history of Prydz Bay, East Antarctica. In: Barron, J; Larsen, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 119, 169-182, https://doi.org/10.2973/odp.proc.sr.119.187.1991 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.757988 https://doi.org/10.1594/PANGAEA.757988 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.757988 https://doi.org/10.2973/odp.proc.sr.119.187.1991 |
_version_ |
1766163991381409792 |