Paleomagnetism and biostratigraphy of sediments from Southern Ocean ODP Site 744 (southern Kerguelen Plateau): Implications for early-to-middle Miocene climate in Antarctica
New paleomagnetic results from lower-to-middle Miocene samples from Ocean Drilling Program (ODP) Holes 744A and 744B, cored during ODP Leg 119 on the southern Kerguelen Plateau (Indian Ocean sector; Southern Ocean), provide a chronostratigraphic framework for an existing and under-utilized paleoclim...
Published in: | Global and Planetary Change |
---|---|
Main Authors: | , , , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier Science Limited
2013
|
Subjects: | |
Online Access: | http://hdl.handle.net/2122/8882 https://doi.org/10.1016/j.gloplacha.2013.05.004 |
id |
ftingv:oai:www.earth-prints.org:2122/8882 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
op_collection_id |
ftingv |
language |
English |
topic |
Antarctica Paleoclimate Miocene Diatom biostratigraphy Paleomagnetism CONOP 03. Hydrosphere::03.01. General::03.01.06. Paleoceanography and paleoclimatology 04. Solid Earth::04.04. Geology::04.04.08. Sediments: dating processes transport 04. Solid Earth::04.04. Geology::04.04.10. Stratigraphy 04. Solid Earth::04.05. Geomagnetism::04.05.09. Environmental magnetism |
spellingShingle |
Antarctica Paleoclimate Miocene Diatom biostratigraphy Paleomagnetism CONOP 03. Hydrosphere::03.01. General::03.01.06. Paleoceanography and paleoclimatology 04. Solid Earth::04.04. Geology::04.04.08. Sediments: dating processes transport 04. Solid Earth::04.04. Geology::04.04.10. Stratigraphy 04. Solid Earth::04.05. Geomagnetism::04.05.09. Environmental magnetism Florindo, F. Farmer, R. K. Harwood, D. M. Cody, R. D. Levy, R. Bohaty, S. M. Carter, L. Winkler, A. Paleomagnetism and biostratigraphy of sediments from Southern Ocean ODP Site 744 (southern Kerguelen Plateau): Implications for early-to-middle Miocene climate in Antarctica |
topic_facet |
Antarctica Paleoclimate Miocene Diatom biostratigraphy Paleomagnetism CONOP 03. Hydrosphere::03.01. General::03.01.06. Paleoceanography and paleoclimatology 04. Solid Earth::04.04. Geology::04.04.08. Sediments: dating processes transport 04. Solid Earth::04.04. Geology::04.04.10. Stratigraphy 04. Solid Earth::04.05. Geomagnetism::04.05.09. Environmental magnetism |
description |
New paleomagnetic results from lower-to-middle Miocene samples from Ocean Drilling Program (ODP) Holes 744A and 744B, cored during ODP Leg 119 on the southern Kerguelen Plateau (Indian Ocean sector; Southern Ocean), provide a chronostratigraphic framework for an existing and under-utilized paleoclimate archive during a key period of Antarctic climate and ice sheet evolution. Site 744 is strategically positioned for high-latitude paleoceanographic and paleoclimatic studies because it lies within the southern domain of the Antarctic Circumpolar Current (ACC) and in proximity to the large and active Lambert Glacier-Amery Ice Shelf drainage system of the East Antarctic Ice Sheet. Magnetostratigraphic results were reported previously for this site, but technical difficulties and limited sampling prevented confident correlation of the magnetic polarity record with the geomagnetic polarity timescale. Our results, which are constrained by new semi-quantitative analyses of diatom assemblages and radiolarian first and last appearance events that are evaluated within a regional Southern Ocean biostratigraphic dataset through Constrained Optimization (CONOP) model runs, permit significant refinement of previous age models for the lower-to-middle Miocene sequence recovered at Site 744 (spanning the interval from ~ 21 to 13.7 Ma). An extended record of sediment accumulation, with average sedimentation rates of ~ 0.7–0.9 cm/kyr, is interrupted by a series of hiatuses in the middle Miocene. These disruptions in sediment supply, or erosional events, could mark a local response of north–south fluctuations in the location and/or strength of the Antarctic Circumpolar Current during transient glacial events within the Mid-Miocene Climate Optimum (MMCO; ~ 17 to 14.45 Ma). With the enhanced age control provided by this study, combined with a refined chronostratigraphy for the underlying upper Eocene to Oligocene strata, Site 744 becomes a good candidate for future high-resolution stable isotope and microfossil paleoecological work, ... |
author2 |
Florindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Farmer, R. K.; Department of Earth and Atmospheric Sciences, University of Nebraska–Lincoln, Lincoln, NE 68588-0340, USA Harwood, D. M.; Department of Earth and Atmospheric Sciences, University of Nebraska–Lincoln, Lincoln, NE 68588-0340, USA Cody, R. D.; Antarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington 6012, New Zealand Levy, R.; Antarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington 6012, New Zealand Bohaty, S. M.; School of Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton SO14 3ZH, UK Carter, L.; Antarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington 6012, New Zealand Winkler, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Department of Earth and Atmospheric Sciences, University of Nebraska–Lincoln, Lincoln, NE 68588-0340, USA Antarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington 6012, New Zealand School of Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton SO14 3ZH, UK |
format |
Article in Journal/Newspaper |
author |
Florindo, F. Farmer, R. K. Harwood, D. M. Cody, R. D. Levy, R. Bohaty, S. M. Carter, L. Winkler, A. |
author_facet |
Florindo, F. Farmer, R. K. Harwood, D. M. Cody, R. D. Levy, R. Bohaty, S. M. Carter, L. Winkler, A. |
author_sort |
Florindo, F. |
title |
Paleomagnetism and biostratigraphy of sediments from Southern Ocean ODP Site 744 (southern Kerguelen Plateau): Implications for early-to-middle Miocene climate in Antarctica |
title_short |
Paleomagnetism and biostratigraphy of sediments from Southern Ocean ODP Site 744 (southern Kerguelen Plateau): Implications for early-to-middle Miocene climate in Antarctica |
title_full |
Paleomagnetism and biostratigraphy of sediments from Southern Ocean ODP Site 744 (southern Kerguelen Plateau): Implications for early-to-middle Miocene climate in Antarctica |
title_fullStr |
Paleomagnetism and biostratigraphy of sediments from Southern Ocean ODP Site 744 (southern Kerguelen Plateau): Implications for early-to-middle Miocene climate in Antarctica |
title_full_unstemmed |
Paleomagnetism and biostratigraphy of sediments from Southern Ocean ODP Site 744 (southern Kerguelen Plateau): Implications for early-to-middle Miocene climate in Antarctica |
title_sort |
paleomagnetism and biostratigraphy of sediments from southern ocean odp site 744 (southern kerguelen plateau): implications for early-to-middle miocene climate in antarctica |
publisher |
Elsevier Science Limited |
publishDate |
2013 |
url |
http://hdl.handle.net/2122/8882 https://doi.org/10.1016/j.gloplacha.2013.05.004 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) ENVELOPE(67.490,67.490,-73.065,-73.065) |
geographic |
Amery Amery Ice Shelf Antarctic East Antarctic Ice Sheet Indian Kerguelen Lambert Glacier Southern Ocean The Antarctic |
geographic_facet |
Amery Amery Ice Shelf Antarctic East Antarctic Ice Sheet Indian Kerguelen Lambert Glacier Southern Ocean The Antarctic |
genre |
Amery Ice Shelf Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Lambert Glacier Southern Ocean |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Lambert Glacier Southern Ocean |
op_relation |
Global and planetary change / 110 (2013) 0921-8181 1872-6364 http://hdl.handle.net/2122/8882 doi:10.1016/j.gloplacha.2013.05.004 |
op_rights |
restricted |
op_doi |
https://doi.org/10.1016/j.gloplacha.2013.05.004 |
container_title |
Global and Planetary Change |
container_volume |
110 |
container_start_page |
434 |
op_container_end_page |
454 |
_version_ |
1766363706121256960 |
spelling |
ftingv:oai:www.earth-prints.org:2122/8882 2023-05-15T13:22:12+02:00 Paleomagnetism and biostratigraphy of sediments from Southern Ocean ODP Site 744 (southern Kerguelen Plateau): Implications for early-to-middle Miocene climate in Antarctica Florindo, F. Farmer, R. K. Harwood, D. M. Cody, R. D. Levy, R. Bohaty, S. M. Carter, L. Winkler, A. Florindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Farmer, R. K.; Department of Earth and Atmospheric Sciences, University of Nebraska–Lincoln, Lincoln, NE 68588-0340, USA Harwood, D. M.; Department of Earth and Atmospheric Sciences, University of Nebraska–Lincoln, Lincoln, NE 68588-0340, USA Cody, R. D.; Antarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington 6012, New Zealand Levy, R.; Antarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington 6012, New Zealand Bohaty, S. M.; School of Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton SO14 3ZH, UK Carter, L.; Antarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington 6012, New Zealand Winkler, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Department of Earth and Atmospheric Sciences, University of Nebraska–Lincoln, Lincoln, NE 68588-0340, USA Antarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington 6012, New Zealand School of Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton SO14 3ZH, UK 2013-11 http://hdl.handle.net/2122/8882 https://doi.org/10.1016/j.gloplacha.2013.05.004 en eng Elsevier Science Limited Global and planetary change / 110 (2013) 0921-8181 1872-6364 http://hdl.handle.net/2122/8882 doi:10.1016/j.gloplacha.2013.05.004 restricted Antarctica Paleoclimate Miocene Diatom biostratigraphy Paleomagnetism CONOP 03. Hydrosphere::03.01. General::03.01.06. Paleoceanography and paleoclimatology 04. Solid Earth::04.04. Geology::04.04.08. Sediments: dating processes transport 04. Solid Earth::04.04. Geology::04.04.10. Stratigraphy 04. Solid Earth::04.05. Geomagnetism::04.05.09. Environmental magnetism article 2013 ftingv https://doi.org/10.1016/j.gloplacha.2013.05.004 2022-07-29T06:06:34Z New paleomagnetic results from lower-to-middle Miocene samples from Ocean Drilling Program (ODP) Holes 744A and 744B, cored during ODP Leg 119 on the southern Kerguelen Plateau (Indian Ocean sector; Southern Ocean), provide a chronostratigraphic framework for an existing and under-utilized paleoclimate archive during a key period of Antarctic climate and ice sheet evolution. Site 744 is strategically positioned for high-latitude paleoceanographic and paleoclimatic studies because it lies within the southern domain of the Antarctic Circumpolar Current (ACC) and in proximity to the large and active Lambert Glacier-Amery Ice Shelf drainage system of the East Antarctic Ice Sheet. Magnetostratigraphic results were reported previously for this site, but technical difficulties and limited sampling prevented confident correlation of the magnetic polarity record with the geomagnetic polarity timescale. Our results, which are constrained by new semi-quantitative analyses of diatom assemblages and radiolarian first and last appearance events that are evaluated within a regional Southern Ocean biostratigraphic dataset through Constrained Optimization (CONOP) model runs, permit significant refinement of previous age models for the lower-to-middle Miocene sequence recovered at Site 744 (spanning the interval from ~ 21 to 13.7 Ma). An extended record of sediment accumulation, with average sedimentation rates of ~ 0.7–0.9 cm/kyr, is interrupted by a series of hiatuses in the middle Miocene. These disruptions in sediment supply, or erosional events, could mark a local response of north–south fluctuations in the location and/or strength of the Antarctic Circumpolar Current during transient glacial events within the Mid-Miocene Climate Optimum (MMCO; ~ 17 to 14.45 Ma). With the enhanced age control provided by this study, combined with a refined chronostratigraphy for the underlying upper Eocene to Oligocene strata, Site 744 becomes a good candidate for future high-resolution stable isotope and microfossil paleoecological work, ... Article in Journal/Newspaper Amery Ice Shelf Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Lambert Glacier Southern Ocean Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Antarctic East Antarctic Ice Sheet Indian Kerguelen Lambert Glacier ENVELOPE(67.490,67.490,-73.065,-73.065) Southern Ocean The Antarctic Global and Planetary Change 110 434 454 |