Depositional environments for strata cored in CRP-3 (Cape Roberts Project), Victoria Land Basin, Antarctica: palaeoglaciological and palaeoclimatological inferences
Cape Roberts Project drill core 3 (CRP-3) was obtained from Roberts ridge, a sea-floor high located at 77°S, 12 km offshore from Cape Roberts in western McMurdo Sound, Antarctica. The recovered core is about 939 m long and comprises strata dated as being early Oligocene (possibly latest Eocene) in a...
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2001
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:58898 2023-05-15T13:32:23+02:00 Depositional environments for strata cored in CRP-3 (Cape Roberts Project), Victoria Land Basin, Antarctica: palaeoglaciological and palaeoclimatological inferences Powell, R. D. Laird, M. G. Naish, T. R. Fielding, C. R. Krissek, L. A. van der Meer, J. J. M. Peter J. Barrett Carlo Alberto Ricci 2001-01-01 https://espace.library.uq.edu.au/view/UQ:58898 eng eng Terra Antartica Publication issn:1122-8628 Cenozoic depositional environment glaciation paleoclimate paleoenvironment 260104 Sedimentology C1 780104 Earth sciences 0499 Other Earth Sciences Journal Article 2001 ftunivqespace 2020-08-04T00:52:53Z Cape Roberts Project drill core 3 (CRP-3) was obtained from Roberts ridge, a sea-floor high located at 77°S, 12 km offshore from Cape Roberts in western McMurdo Sound, Antarctica. The recovered core is about 939 m long and comprises strata dated as being early Oligocene (possibly latest Eocene) in age, resting unconformably on ∼ 116 m of basement rocks consisting of Palaeozoic Beacon Supergroup sediments. The core includes ten facies commonly occuring in five major associations that are repeated in particular sequences throughout the core and which are interpreted as representing different depositional environments through time. Depositional systems inferred to be represented in the succession include: outer shelf, inner shelf, nearshore to shoreface each under iceberg influence, deltaic and/or grounding-line fan, and ice proximal-ice marginal-subglacial (mass flow/rainout diamictite/subglacial till) singly or in combination. The record is taken to represent the initial talus/alluvial fan setting of a glaciated rift margin adjacent to the block-uplifted Transantarctic Mountains. Development of a deltaic succession upcore was probably associated with the formation of palaeo-Mackay valley with temperate glaciers in its headwaters. At that stage glaciation was intense enough to support glaciers ending in the sea elsewhere along the coast, but a local glacier was fluctuating down to the sea by the time the youngest part of CRP-3 was being deposited. Changes in palaeoenvironmental interpretations in this youngest part of the core are used to estimate relative glacial proximity to the drillsite through time. These inferred glacial fluctuations are compared with the global δ18O and Mg/Ca curves to evaluate the potential of glacial fluctuations on Antarctica for influencing these records of global change. Although the comparisons are tentative at present, the records do have similarities, but there are also some differences that require further evaluation. Article in Journal/Newspaper Antarc* Antarctica McMurdo Sound Victoria Land The University of Queensland: UQ eSpace Cape Roberts ENVELOPE(-70.467,-70.467,-68.950,-68.950) Mackay ENVELOPE(168.517,168.517,-77.700,-77.700) McMurdo Sound Roberts Ridge ENVELOPE(-131.500,-131.500,-86.383,-86.383) Transantarctic Mountains Victoria Land |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Cenozoic depositional environment glaciation paleoclimate paleoenvironment 260104 Sedimentology C1 780104 Earth sciences 0499 Other Earth Sciences |
spellingShingle |
Cenozoic depositional environment glaciation paleoclimate paleoenvironment 260104 Sedimentology C1 780104 Earth sciences 0499 Other Earth Sciences Powell, R. D. Laird, M. G. Naish, T. R. Fielding, C. R. Krissek, L. A. van der Meer, J. J. M. Depositional environments for strata cored in CRP-3 (Cape Roberts Project), Victoria Land Basin, Antarctica: palaeoglaciological and palaeoclimatological inferences |
topic_facet |
Cenozoic depositional environment glaciation paleoclimate paleoenvironment 260104 Sedimentology C1 780104 Earth sciences 0499 Other Earth Sciences |
description |
Cape Roberts Project drill core 3 (CRP-3) was obtained from Roberts ridge, a sea-floor high located at 77°S, 12 km offshore from Cape Roberts in western McMurdo Sound, Antarctica. The recovered core is about 939 m long and comprises strata dated as being early Oligocene (possibly latest Eocene) in age, resting unconformably on ∼ 116 m of basement rocks consisting of Palaeozoic Beacon Supergroup sediments. The core includes ten facies commonly occuring in five major associations that are repeated in particular sequences throughout the core and which are interpreted as representing different depositional environments through time. Depositional systems inferred to be represented in the succession include: outer shelf, inner shelf, nearshore to shoreface each under iceberg influence, deltaic and/or grounding-line fan, and ice proximal-ice marginal-subglacial (mass flow/rainout diamictite/subglacial till) singly or in combination. The record is taken to represent the initial talus/alluvial fan setting of a glaciated rift margin adjacent to the block-uplifted Transantarctic Mountains. Development of a deltaic succession upcore was probably associated with the formation of palaeo-Mackay valley with temperate glaciers in its headwaters. At that stage glaciation was intense enough to support glaciers ending in the sea elsewhere along the coast, but a local glacier was fluctuating down to the sea by the time the youngest part of CRP-3 was being deposited. Changes in palaeoenvironmental interpretations in this youngest part of the core are used to estimate relative glacial proximity to the drillsite through time. These inferred glacial fluctuations are compared with the global δ18O and Mg/Ca curves to evaluate the potential of glacial fluctuations on Antarctica for influencing these records of global change. Although the comparisons are tentative at present, the records do have similarities, but there are also some differences that require further evaluation. |
author2 |
Peter J. Barrett Carlo Alberto Ricci |
format |
Article in Journal/Newspaper |
author |
Powell, R. D. Laird, M. G. Naish, T. R. Fielding, C. R. Krissek, L. A. van der Meer, J. J. M. |
author_facet |
Powell, R. D. Laird, M. G. Naish, T. R. Fielding, C. R. Krissek, L. A. van der Meer, J. J. M. |
author_sort |
Powell, R. D. |
title |
Depositional environments for strata cored in CRP-3 (Cape Roberts Project), Victoria Land Basin, Antarctica: palaeoglaciological and palaeoclimatological inferences |
title_short |
Depositional environments for strata cored in CRP-3 (Cape Roberts Project), Victoria Land Basin, Antarctica: palaeoglaciological and palaeoclimatological inferences |
title_full |
Depositional environments for strata cored in CRP-3 (Cape Roberts Project), Victoria Land Basin, Antarctica: palaeoglaciological and palaeoclimatological inferences |
title_fullStr |
Depositional environments for strata cored in CRP-3 (Cape Roberts Project), Victoria Land Basin, Antarctica: palaeoglaciological and palaeoclimatological inferences |
title_full_unstemmed |
Depositional environments for strata cored in CRP-3 (Cape Roberts Project), Victoria Land Basin, Antarctica: palaeoglaciological and palaeoclimatological inferences |
title_sort |
depositional environments for strata cored in crp-3 (cape roberts project), victoria land basin, antarctica: palaeoglaciological and palaeoclimatological inferences |
publisher |
Terra Antartica Publication |
publishDate |
2001 |
url |
https://espace.library.uq.edu.au/view/UQ:58898 |
long_lat |
ENVELOPE(-70.467,-70.467,-68.950,-68.950) ENVELOPE(168.517,168.517,-77.700,-77.700) ENVELOPE(-131.500,-131.500,-86.383,-86.383) |
geographic |
Cape Roberts Mackay McMurdo Sound Roberts Ridge Transantarctic Mountains Victoria Land |
geographic_facet |
Cape Roberts Mackay McMurdo Sound Roberts Ridge Transantarctic Mountains Victoria Land |
genre |
Antarc* Antarctica McMurdo Sound Victoria Land |
genre_facet |
Antarc* Antarctica McMurdo Sound Victoria Land |
op_relation |
issn:1122-8628 |
_version_ |
1766026228583628800 |