Chronostratigraphy of the CRP-3 drillhole, Victoria Land Basin, Antarctica
An 823 m thick glaciomarine Cenozoic section sitting unconformably on the Lower Devonian Beacon Supergroup was recovered in CRP –3. This paper reviews the chronostratigraphical constraints for the Cenozoic section. Between 3 and 480.27 mbsf 23 unconformity bounded cycles of sediment were recorded. E...
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2001
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:58900 2023-05-15T13:32:23+02:00 Chronostratigraphy of the CRP-3 drillhole, Victoria Land Basin, Antarctica Hannah, M. J. Florindo, F. Harwood, D. M. Fielding, C. R. Peter J. Barrett Carlo Alberto Ricci 2001-01-01 https://espace.library.uq.edu.au/view/UQ:58900 eng eng Terra Antartica Publication issn:1122-8628 260109 Geochronology C1 780104 Earth sciences Journal Article 2001 ftunivqespace 2020-08-04T00:52:53Z An 823 m thick glaciomarine Cenozoic section sitting unconformably on the Lower Devonian Beacon Supergroup was recovered in CRP –3. This paper reviews the chronostratigraphical constraints for the Cenozoic section. Between 3 and 480.27 mbsf 23 unconformity bounded cycles of sediment were recorded. Each unconformity is thought to represent a hiatus of uncertain duration. Four magnetozones have been recognised from the Cenozoic section. The record is complex with several “tiny wiggles” recorded throughout. Biostratigraphical or Sr ages, which could be used to link these magnetozones to the magnetic polarity time scale are restricted to the upper 190 m of sediment. Two diatom datums (Cavitatus jouseanus at 48.9 mbsf and Rhizosolenica antarctica at 68.60 mbsf), together with five Sr-isotope dates derived from molluscan fragments taken from between 10.88 and 190.29 mbsf indicate an early Oligocene (c. 31 Ma) age for this interval. The appearance of a new species of the bivalve ?Adamussium at about 325 mbsf, suggests that the Oligocene age can be extended down to this level. This confirms that the dominantly reversed magnetozone (R1), recorded down to about 340 mbsf, is Chron C12r. The ages imply high sedimentation rates and only minimal time gaps at the sequence boundaries. Below 340 mbsf there are no independent datums to guide the correlation of the magnetozones to the magnetic polarity time scale. However, the absence of in situ dinocysts attributable to Transantarctic Flora, if not a result of environmental control, limits the age of the base of the hole to between c. 33.5 and 35 Ma. Article in Journal/Newspaper Antarc* Antarctica Victoria Land The University of Queensland: UQ eSpace Victoria Land |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
260109 Geochronology C1 780104 Earth sciences |
spellingShingle |
260109 Geochronology C1 780104 Earth sciences Hannah, M. J. Florindo, F. Harwood, D. M. Fielding, C. R. Chronostratigraphy of the CRP-3 drillhole, Victoria Land Basin, Antarctica |
topic_facet |
260109 Geochronology C1 780104 Earth sciences |
description |
An 823 m thick glaciomarine Cenozoic section sitting unconformably on the Lower Devonian Beacon Supergroup was recovered in CRP –3. This paper reviews the chronostratigraphical constraints for the Cenozoic section. Between 3 and 480.27 mbsf 23 unconformity bounded cycles of sediment were recorded. Each unconformity is thought to represent a hiatus of uncertain duration. Four magnetozones have been recognised from the Cenozoic section. The record is complex with several “tiny wiggles” recorded throughout. Biostratigraphical or Sr ages, which could be used to link these magnetozones to the magnetic polarity time scale are restricted to the upper 190 m of sediment. Two diatom datums (Cavitatus jouseanus at 48.9 mbsf and Rhizosolenica antarctica at 68.60 mbsf), together with five Sr-isotope dates derived from molluscan fragments taken from between 10.88 and 190.29 mbsf indicate an early Oligocene (c. 31 Ma) age for this interval. The appearance of a new species of the bivalve ?Adamussium at about 325 mbsf, suggests that the Oligocene age can be extended down to this level. This confirms that the dominantly reversed magnetozone (R1), recorded down to about 340 mbsf, is Chron C12r. The ages imply high sedimentation rates and only minimal time gaps at the sequence boundaries. Below 340 mbsf there are no independent datums to guide the correlation of the magnetozones to the magnetic polarity time scale. However, the absence of in situ dinocysts attributable to Transantarctic Flora, if not a result of environmental control, limits the age of the base of the hole to between c. 33.5 and 35 Ma. |
author2 |
Peter J. Barrett Carlo Alberto Ricci |
format |
Article in Journal/Newspaper |
author |
Hannah, M. J. Florindo, F. Harwood, D. M. Fielding, C. R. |
author_facet |
Hannah, M. J. Florindo, F. Harwood, D. M. Fielding, C. R. |
author_sort |
Hannah, M. J. |
title |
Chronostratigraphy of the CRP-3 drillhole, Victoria Land Basin, Antarctica |
title_short |
Chronostratigraphy of the CRP-3 drillhole, Victoria Land Basin, Antarctica |
title_full |
Chronostratigraphy of the CRP-3 drillhole, Victoria Land Basin, Antarctica |
title_fullStr |
Chronostratigraphy of the CRP-3 drillhole, Victoria Land Basin, Antarctica |
title_full_unstemmed |
Chronostratigraphy of the CRP-3 drillhole, Victoria Land Basin, Antarctica |
title_sort |
chronostratigraphy of the crp-3 drillhole, victoria land basin, antarctica |
publisher |
Terra Antartica Publication |
publishDate |
2001 |
url |
https://espace.library.uq.edu.au/view/UQ:58900 |
geographic |
Victoria Land |
geographic_facet |
Victoria Land |
genre |
Antarc* Antarctica Victoria Land |
genre_facet |
Antarc* Antarctica Victoria Land |
op_relation |
issn:1122-8628 |
_version_ |
1766026230608429056 |