Facies Architecture of the CRP-3 Drillhole, Victoria Land Basin, Antarctica
The Cenozoic Victoria Land Basin (VLB) stratigraphic section penetrated by CRP-3 is mostly of Early Oligocene age. It contains an array of lithofacies comprising fine-grained mudrocks, interlaminated and interbedded mudrocks/sandstones, mud-rich and mud-poor sandstones, conglomerates and diamctites...
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ftunivnebraskali:oai:digitalcommons.unl.edu:geosciencefacpub-1131 2023-11-12T04:04:12+01:00 Facies Architecture of the CRP-3 Drillhole, Victoria Land Basin, Antarctica Fielding, Christopher R. Naish, T. R. Woolfe, K. J. 2001-01-01T08:00:00Z application/pdf https://digitalcommons.unl.edu/geosciencefacpub/130 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1131/viewcontent/Fielding_TA_2001_Facies_architecture.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/geosciencefacpub/130 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1131/viewcontent/Fielding_TA_2001_Facies_architecture.pdf Papers in the Earth and Atmospheric Sciences Earth Sciences text 2001 ftunivnebraskali 2023-10-30T10:44:18Z The Cenozoic Victoria Land Basin (VLB) stratigraphic section penetrated by CRP-3 is mostly of Early Oligocene age. It contains an array of lithofacies comprising fine-grained mudrocks, interlaminated and interbedded mudrocks/sandstones, mud-rich and mud-poor sandstones, conglomerates and diamctites that are together interpreted as the products of shallow marine to possibly non-marine environments of deposition, affected by the periodic advance and retreat of tidewater glaciers. This lithofacies assemblage can be readily rationalised using the facies scheme designed originally for CRP-2/2A, and published previously. The uppermost 330 metres below sea floor (mbsf) shows a cyclical arrangement of lithofacies also similar to that recognised throughout CRP-2/2A, and interpreted to reflect cyclical variations in relative sea-level driven by ice volume fluctuations (“Motif A”). Between 330 and 480 mbsf, a series of less clearly cyclical units, generally fining-upward but nonetheless incorporating a significant subset of the facies assemblage, has been identified and noted in the Initial Report as “Motif B. Below 480 mbsf, the section is arranged into a repetitive succession of finingupward units, each of which comprises dolerite clast conglomerate at the base passing upward into relatively thick intervals of sandstones. The cycles present down 480 mbsf are defined as sequences, each interpreted to record cyclical variation of relative sea-level. The thickness distribution of sequences in CRP-3 provides some insights into the geological variables controlling sediment accumulation in the Early Oligocene section. The uppermost part of the section in CRP-3 comprises two or three thick, complete sequences that show a broadly symmetrical arrangement of lithofacies (similar to Sequences 9-11 in CRP-2/2A). This suggests a period of relatively rapid tectonic subsidence, which allowed preservation of the complete facies cycle. Below Sequence 3, however, is a considerable interval of thin, incomplete and erosionally truncated ... Text Antarc* Antarctica Victoria Land University of Nebraska-Lincoln: DigitalCommons@UNL Victoria Land |
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Open Polar |
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University of Nebraska-Lincoln: DigitalCommons@UNL |
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ftunivnebraskali |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Fielding, Christopher R. Naish, T. R. Woolfe, K. J. Facies Architecture of the CRP-3 Drillhole, Victoria Land Basin, Antarctica |
topic_facet |
Earth Sciences |
description |
The Cenozoic Victoria Land Basin (VLB) stratigraphic section penetrated by CRP-3 is mostly of Early Oligocene age. It contains an array of lithofacies comprising fine-grained mudrocks, interlaminated and interbedded mudrocks/sandstones, mud-rich and mud-poor sandstones, conglomerates and diamctites that are together interpreted as the products of shallow marine to possibly non-marine environments of deposition, affected by the periodic advance and retreat of tidewater glaciers. This lithofacies assemblage can be readily rationalised using the facies scheme designed originally for CRP-2/2A, and published previously. The uppermost 330 metres below sea floor (mbsf) shows a cyclical arrangement of lithofacies also similar to that recognised throughout CRP-2/2A, and interpreted to reflect cyclical variations in relative sea-level driven by ice volume fluctuations (“Motif A”). Between 330 and 480 mbsf, a series of less clearly cyclical units, generally fining-upward but nonetheless incorporating a significant subset of the facies assemblage, has been identified and noted in the Initial Report as “Motif B. Below 480 mbsf, the section is arranged into a repetitive succession of finingupward units, each of which comprises dolerite clast conglomerate at the base passing upward into relatively thick intervals of sandstones. The cycles present down 480 mbsf are defined as sequences, each interpreted to record cyclical variation of relative sea-level. The thickness distribution of sequences in CRP-3 provides some insights into the geological variables controlling sediment accumulation in the Early Oligocene section. The uppermost part of the section in CRP-3 comprises two or three thick, complete sequences that show a broadly symmetrical arrangement of lithofacies (similar to Sequences 9-11 in CRP-2/2A). This suggests a period of relatively rapid tectonic subsidence, which allowed preservation of the complete facies cycle. Below Sequence 3, however, is a considerable interval of thin, incomplete and erosionally truncated ... |
format |
Text |
author |
Fielding, Christopher R. Naish, T. R. Woolfe, K. J. |
author_facet |
Fielding, Christopher R. Naish, T. R. Woolfe, K. J. |
author_sort |
Fielding, Christopher R. |
title |
Facies Architecture of the CRP-3 Drillhole, Victoria Land Basin, Antarctica |
title_short |
Facies Architecture of the CRP-3 Drillhole, Victoria Land Basin, Antarctica |
title_full |
Facies Architecture of the CRP-3 Drillhole, Victoria Land Basin, Antarctica |
title_fullStr |
Facies Architecture of the CRP-3 Drillhole, Victoria Land Basin, Antarctica |
title_full_unstemmed |
Facies Architecture of the CRP-3 Drillhole, Victoria Land Basin, Antarctica |
title_sort |
facies architecture of the crp-3 drillhole, victoria land basin, antarctica |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
2001 |
url |
https://digitalcommons.unl.edu/geosciencefacpub/130 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1131/viewcontent/Fielding_TA_2001_Facies_architecture.pdf |
geographic |
Victoria Land |
geographic_facet |
Victoria Land |
genre |
Antarc* Antarctica Victoria Land |
genre_facet |
Antarc* Antarctica Victoria Land |
op_source |
Papers in the Earth and Atmospheric Sciences |
op_relation |
https://digitalcommons.unl.edu/geosciencefacpub/130 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1131/viewcontent/Fielding_TA_2001_Facies_architecture.pdf |
_version_ |
1782341040508764160 |