Geotechnical properties of shelf sdiments from the Prydz Bay
This paper presents a geotechnical characterization of the glacigenic sediments in Prydz Bay, East Antarctica, based on the shipboard physical properties data obtained during Leg 119, combined with results of land-based analyses of 24 whole-round core samples. Main emphasis is placed on the land-bas...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.757958 2024-09-15T17:40:16+00:00 Geotechnical properties of shelf sdiments from the Prydz Bay Solheim, Anders Forsberg, Carl Fredrik Pittenger, Alan MEDIAN LATITUDE: -67.828200 * MEDIAN LONGITUDE: 75.678788 * 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 2011 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.757958 https://doi.org/10.1594/PANGAEA.757958 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.757958 https://doi.org/10.1594/PANGAEA.757958 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Solheim, Anders; Forsberg, Carl Fredrik; Pittenger, Alan (1991): Geotechnical properties of glacigenic shelf sediments from 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, 143-167, https://doi.org/10.2973/odp.proc.sr.119.186.1991 119-739 119-739C 119-740 119-740A 119-741 119-741A 119-742 119-742A 119-743 119-743A COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg119 Ocean Drilling Program ODP Prydz Bay dataset publication series 2011 ftpangaea https://doi.org/10.1594/PANGAEA.75795810.2973/odp.proc.sr.119.186.1991 2024-07-24T02:31:20Z This paper presents a geotechnical characterization of the glacigenic sediments in Prydz Bay, East Antarctica, based on the shipboard physical properties data obtained during Leg 119, combined with results of land-based analyses of 24 whole-round core samples. Main emphasis is placed on the land-based studies, which included oedometer consolidation tests, triaxial and simple shear tests for undrained shear strength, permeability tests in oedometer and triaxial cell, Atterberg limits, and grain-size analyses. The bulk of the tested sediments comprise overconsolidated diamictites of a relatively uniform lithology. The overconsolidation results from a combination of glacial loading and sediment overburden subsequently removed by extensive glacial erosion of the shelf. This leads to downhole profiles of physical properties that have been observed not to change as a function of the thickness of present overburden. A number of fluctuations in the parameters shows a relatively systematic trend and most likely results from changes in the proximity to the ice sheet grounding line in response to variations in the glacial regime. Very low permeabilities mainly result from high preconsolidation stresses (Pc'). Pc' values up to 10,000 kPa were estimated from the oedometer tests, and empirical estimates based on undrained shear strengths (up to 2500 kPa) indicate that the oedometer results are conservative. The diamictites generally classify as inactive, of low to medium plasticity, and they consolidate with little deformation, even when subjected to great stresses. This is the first report of geotechnical data from deep boreholes on the Antarctic continental shelf, but material of similar character can also be expected in other areas around the Antarctic. Other/Unknown Material Antarc* Antarctic Antarctica East Antarctica Ice Sheet Prydz Bay PANGAEA - Data Publisher for Earth & Environmental Science 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 119-740 119-740A 119-741 119-741A 119-742 119-742A 119-743 119-743A COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg119 Ocean Drilling Program ODP Prydz Bay |
spellingShingle |
119-739 119-739C 119-740 119-740A 119-741 119-741A 119-742 119-742A 119-743 119-743A COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg119 Ocean Drilling Program ODP Prydz Bay Solheim, Anders Forsberg, Carl Fredrik Pittenger, Alan Geotechnical properties of shelf sdiments from the Prydz Bay |
topic_facet |
119-739 119-739C 119-740 119-740A 119-741 119-741A 119-742 119-742A 119-743 119-743A COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg119 Ocean Drilling Program ODP Prydz Bay |
description |
This paper presents a geotechnical characterization of the glacigenic sediments in Prydz Bay, East Antarctica, based on the shipboard physical properties data obtained during Leg 119, combined with results of land-based analyses of 24 whole-round core samples. Main emphasis is placed on the land-based studies, which included oedometer consolidation tests, triaxial and simple shear tests for undrained shear strength, permeability tests in oedometer and triaxial cell, Atterberg limits, and grain-size analyses. The bulk of the tested sediments comprise overconsolidated diamictites of a relatively uniform lithology. The overconsolidation results from a combination of glacial loading and sediment overburden subsequently removed by extensive glacial erosion of the shelf. This leads to downhole profiles of physical properties that have been observed not to change as a function of the thickness of present overburden. A number of fluctuations in the parameters shows a relatively systematic trend and most likely results from changes in the proximity to the ice sheet grounding line in response to variations in the glacial regime. Very low permeabilities mainly result from high preconsolidation stresses (Pc'). Pc' values up to 10,000 kPa were estimated from the oedometer tests, and empirical estimates based on undrained shear strengths (up to 2500 kPa) indicate that the oedometer results are conservative. The diamictites generally classify as inactive, of low to medium plasticity, and they consolidate with little deformation, even when subjected to great stresses. This is the first report of geotechnical data from deep boreholes on the Antarctic continental shelf, but material of similar character can also be expected in other areas around the Antarctic. |
format |
Other/Unknown Material |
author |
Solheim, Anders Forsberg, Carl Fredrik Pittenger, Alan |
author_facet |
Solheim, Anders Forsberg, Carl Fredrik Pittenger, Alan |
author_sort |
Solheim, Anders |
title |
Geotechnical properties of shelf sdiments from the Prydz Bay |
title_short |
Geotechnical properties of shelf sdiments from the Prydz Bay |
title_full |
Geotechnical properties of shelf sdiments from the Prydz Bay |
title_fullStr |
Geotechnical properties of shelf sdiments from the Prydz Bay |
title_full_unstemmed |
Geotechnical properties of shelf sdiments from the Prydz Bay |
title_sort |
geotechnical properties of shelf sdiments from the prydz bay |
publisher |
PANGAEA |
publishDate |
2011 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.757958 https://doi.org/10.1594/PANGAEA.757958 |
op_coverage |
MEDIAN LATITUDE: -67.828200 * MEDIAN LONGITUDE: 75.678788 * 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) |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Prydz Bay |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Prydz Bay |
op_source |
Supplement to: Solheim, Anders; Forsberg, Carl Fredrik; Pittenger, Alan (1991): Geotechnical properties of glacigenic shelf sediments from 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, 143-167, https://doi.org/10.2973/odp.proc.sr.119.186.1991 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.757958 https://doi.org/10.1594/PANGAEA.757958 |
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.75795810.2973/odp.proc.sr.119.186.1991 |
_version_ |
1810486089777938432 |