Magnetostratigraphic calibration of Southern Ocean diatom datums from the Eocene-Oligocene of Kerguelen Plateau (Ocean Drilling Program sites 744 and 748)

Ocean Drilling Program holes 744Aand 748B represent key sections for calibration of Southern Ocean Eocene-Oligocene biostratigraphic zonations. Sites 744 and 748 were above the carbonate compensation depth throughout this time interval and contain good planktonic foraminiferal, calcareous nannofossi...

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Published in:Palaeogeography, Palaeoclimatology, Palaeoecology
Main Authors: Roberts, A. P., Bicknell, S. J., Byatt, J., Bohaty, S. M., Florindo, F., Harwood, D. M.
Other Authors: Roberts, A. P.; School of Ocean and Earth Science, University of Southampton, Southampton Oceanography Centre, European Way, Southampton SO14 3ZH, UK, Bicknell, S. J.; School of Ocean and Earth Science, University of Southampton, Southampton Oceanography Centre, European Way, Southampton SO14 3ZH, UK, Byatt, J.; School of Ocean and Earth Science, University of Southampton, Southampton Oceanography Centre, European Way, Southampton SO14 3ZH, UK, Bohaty, S. M.; Department of Earth Sciences, University of California, Santa Cruz, CA 95064, USA, Florindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Harwood, D. M.; Department of Geosciences, University of Nebraska, Lincoln, NE 68588-0340, USA, School of Ocean and Earth Science, University of Southampton, Southampton Oceanography Centre, European Way, Southampton SO14 3ZH, UK, Department of Earth Sciences, University of California, Santa Cruz, CA 95064, USA, Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Department of Geosciences, University of Nebraska, Lincoln, NE 68588-0340, USA
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2003
Subjects:
Online Access:http://hdl.handle.net/2122/4015
https://doi.org/10.1016/S0031-0182(03)00397-3
id ftingv:oai:www.earth-prints.org:2122/4015
record_format openpolar
institution Open Polar
collection Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia)
op_collection_id ftingv
language English
topic Eocene
Oligocene
Ocean Drilling Program
holes 744A and 748B
Kerguelen Plateau
Antarctica
magnetostratigraphy
biostratigraphy
diatoms
foraminifera
calcareous nannofossils
03. Hydrosphere::03.01. General::03.01.06. Paleoceanography and paleoclimatology
04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism
spellingShingle Eocene
Oligocene
Ocean Drilling Program
holes 744A and 748B
Kerguelen Plateau
Antarctica
magnetostratigraphy
biostratigraphy
diatoms
foraminifera
calcareous nannofossils
03. Hydrosphere::03.01. General::03.01.06. Paleoceanography and paleoclimatology
04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism
Roberts, A. P.
Bicknell, S. J.
Byatt, J.
Bohaty, S. M.
Florindo, F.
Harwood, D. M.
Magnetostratigraphic calibration of Southern Ocean diatom datums from the Eocene-Oligocene of Kerguelen Plateau (Ocean Drilling Program sites 744 and 748)
topic_facet Eocene
Oligocene
Ocean Drilling Program
holes 744A and 748B
Kerguelen Plateau
Antarctica
magnetostratigraphy
biostratigraphy
diatoms
foraminifera
calcareous nannofossils
03. Hydrosphere::03.01. General::03.01.06. Paleoceanography and paleoclimatology
04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism
description Ocean Drilling Program holes 744Aand 748B represent key sections for calibration of Southern Ocean Eocene-Oligocene biostratigraphic zonations. Sites 744 and 748 were above the carbonate compensation depth throughout this time interval and contain good planktonic foraminiferal, calcareous nannofossil, and diatom biostratigraphic records. In particular, the Southern Ocean diatom biostratigraphic zonation for the Oligocene critically hinges on calibration of these two holes. Previous low-resolution magnetostratigraphic studies at these sites were hampered by limited sampling and technical difficulties, which prompted our high-resolution reinvestigation of the magnetostratigraphy. Magnetic polarity zonations for holes 744Aand 748B were constructed after inspection of vector component plots at 1-cm stratigraphic intervals from continuous u-channel measurements. The magnetizations are generally stable and a robust polarity stratigraphy has been obtained for both holes. The increased resolution of our study and identification of persistent secondary overprints, which were not recognised in previous studies, suggests that the previously published interpretations need to be revised. Our magnetostratigraphic interpretations for both holes are constrained by foraminiferal and calcareous nannofossil datums, as well as by Sr isotope ages. We have calibrated four diatom datums, which are synchronous at the two studied sites, to the geomagnetic polarity timescale, including the first occurrence (FO) of Lisitzinia ornata (27.8 Ma), the FO of Rocella vigilans var. B (27.8 Ma), the FO of Cavitatus jouseanus (30.9 Ma) and the FO of Rhizosolenia oligocaenica (33.8 Ma). The synchroneity of these datums suggests that diatom biostratigraphy has considerable potential for Palaeogene biostratigraphic correlation in the Southern Ocean. Although the ages of some datums are obscured by an unconformity in Hole 744A, our age model from Hole 748B suggests age estimates for the last common occurrence of Rocella vigilans var. A(~29.0 Ma), the ...
author2 Roberts, A. P.; School of Ocean and Earth Science, University of Southampton, Southampton Oceanography Centre, European Way, Southampton SO14 3ZH, UK
Bicknell, S. J.; School of Ocean and Earth Science, University of Southampton, Southampton Oceanography Centre, European Way, Southampton SO14 3ZH, UK
Byatt, J.; School of Ocean and Earth Science, University of Southampton, Southampton Oceanography Centre, European Way, Southampton SO14 3ZH, UK
Bohaty, S. M.; Department of Earth Sciences, University of California, Santa Cruz, CA 95064, USA
Florindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia
Harwood, D. M.; Department of Geosciences, University of Nebraska, Lincoln, NE 68588-0340, USA
School of Ocean and Earth Science, University of Southampton, Southampton Oceanography Centre, European Way, Southampton SO14 3ZH, UK
Department of Earth Sciences, University of California, Santa Cruz, CA 95064, USA
Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia
Department of Geosciences, University of Nebraska, Lincoln, NE 68588-0340, USA
format Article in Journal/Newspaper
author Roberts, A. P.
Bicknell, S. J.
Byatt, J.
Bohaty, S. M.
Florindo, F.
Harwood, D. M.
author_facet Roberts, A. P.
Bicknell, S. J.
Byatt, J.
Bohaty, S. M.
Florindo, F.
Harwood, D. M.
author_sort Roberts, A. P.
title Magnetostratigraphic calibration of Southern Ocean diatom datums from the Eocene-Oligocene of Kerguelen Plateau (Ocean Drilling Program sites 744 and 748)
title_short Magnetostratigraphic calibration of Southern Ocean diatom datums from the Eocene-Oligocene of Kerguelen Plateau (Ocean Drilling Program sites 744 and 748)
title_full Magnetostratigraphic calibration of Southern Ocean diatom datums from the Eocene-Oligocene of Kerguelen Plateau (Ocean Drilling Program sites 744 and 748)
title_fullStr Magnetostratigraphic calibration of Southern Ocean diatom datums from the Eocene-Oligocene of Kerguelen Plateau (Ocean Drilling Program sites 744 and 748)
title_full_unstemmed Magnetostratigraphic calibration of Southern Ocean diatom datums from the Eocene-Oligocene of Kerguelen Plateau (Ocean Drilling Program sites 744 and 748)
title_sort magnetostratigraphic calibration of southern ocean diatom datums from the eocene-oligocene of kerguelen plateau (ocean drilling program sites 744 and 748)
publisher Elsevier
publishDate 2003
url http://hdl.handle.net/2122/4015
https://doi.org/10.1016/S0031-0182(03)00397-3
geographic Kerguelen
Southern Ocean
geographic_facet Kerguelen
Southern Ocean
genre Antarc*
Antarctica
Southern Ocean
genre_facet Antarc*
Antarctica
Southern Ocean
op_relation Palaeogeography, Palaeoclimatology, Palaeoecology
1 / 198 (2003)
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doi:10.1016/S0031-0182(03)00397-3
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spelling ftingv:oai:www.earth-prints.org:2122/4015 2023-05-15T13:51:39+02:00 Magnetostratigraphic calibration of Southern Ocean diatom datums from the Eocene-Oligocene of Kerguelen Plateau (Ocean Drilling Program sites 744 and 748) Roberts, A. P. Bicknell, S. J. Byatt, J. Bohaty, S. M. Florindo, F. Harwood, D. M. Roberts, A. P.; School of Ocean and Earth Science, University of Southampton, Southampton Oceanography Centre, European Way, Southampton SO14 3ZH, UK Bicknell, S. J.; School of Ocean and Earth Science, University of Southampton, Southampton Oceanography Centre, European Way, Southampton SO14 3ZH, UK Byatt, J.; School of Ocean and Earth Science, University of Southampton, Southampton Oceanography Centre, European Way, Southampton SO14 3ZH, UK Bohaty, S. M.; Department of Earth Sciences, University of California, Santa Cruz, CA 95064, USA Florindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Harwood, D. M.; Department of Geosciences, University of Nebraska, Lincoln, NE 68588-0340, USA School of Ocean and Earth Science, University of Southampton, Southampton Oceanography Centre, European Way, Southampton SO14 3ZH, UK Department of Earth Sciences, University of California, Santa Cruz, CA 95064, USA Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Department of Geosciences, University of Nebraska, Lincoln, NE 68588-0340, USA 2003-09-15 http://hdl.handle.net/2122/4015 https://doi.org/10.1016/S0031-0182(03)00397-3 en eng Elsevier Palaeogeography, Palaeoclimatology, Palaeoecology 1 / 198 (2003) Baldauf, J.G., Barron, J.A., 1991. Diatom biostratigraphy: Kerguelen Plateau and Prydz Bay regions of the Southern Ocean. In: Barron, J., Larsen, B., et al. (Eds.), Proc. ODP Sci. Res. 119, 547-598. Barrera, E., Barron, J., Halliday, A., 1991. Strontium isotope stratigraphy of the Oligocene-lower Miocene section at site 744, southern Indian Ocean. 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Paleomagnetism article 2003 ftingv https://doi.org/10.1016/S0031-0182(03)00397-3 https://doi.org/10.1016/S0031-0182(03)00395-X 2022-07-29T06:04:57Z Ocean Drilling Program holes 744Aand 748B represent key sections for calibration of Southern Ocean Eocene-Oligocene biostratigraphic zonations. Sites 744 and 748 were above the carbonate compensation depth throughout this time interval and contain good planktonic foraminiferal, calcareous nannofossil, and diatom biostratigraphic records. In particular, the Southern Ocean diatom biostratigraphic zonation for the Oligocene critically hinges on calibration of these two holes. Previous low-resolution magnetostratigraphic studies at these sites were hampered by limited sampling and technical difficulties, which prompted our high-resolution reinvestigation of the magnetostratigraphy. Magnetic polarity zonations for holes 744Aand 748B were constructed after inspection of vector component plots at 1-cm stratigraphic intervals from continuous u-channel measurements. The magnetizations are generally stable and a robust polarity stratigraphy has been obtained for both holes. The increased resolution of our study and identification of persistent secondary overprints, which were not recognised in previous studies, suggests that the previously published interpretations need to be revised. Our magnetostratigraphic interpretations for both holes are constrained by foraminiferal and calcareous nannofossil datums, as well as by Sr isotope ages. We have calibrated four diatom datums, which are synchronous at the two studied sites, to the geomagnetic polarity timescale, including the first occurrence (FO) of Lisitzinia ornata (27.8 Ma), the FO of Rocella vigilans var. B (27.8 Ma), the FO of Cavitatus jouseanus (30.9 Ma) and the FO of Rhizosolenia oligocaenica (33.8 Ma). The synchroneity of these datums suggests that diatom biostratigraphy has considerable potential for Palaeogene biostratigraphic correlation in the Southern Ocean. Although the ages of some datums are obscured by an unconformity in Hole 744A, our age model from Hole 748B suggests age estimates for the last common occurrence of Rocella vigilans var. A(~29.0 Ma), the ... Article in Journal/Newspaper Antarc* Antarctica Southern Ocean Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Kerguelen Southern Ocean Palaeogeography, Palaeoclimatology, Palaeoecology 198 1-2 145 168