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...
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2013
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ftsouthampton:oai:eprints.soton.ac.uk:360433 2023-07-30T03:55:58+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, Fabio Farmer, Ryan K. Harwood, David M. Cody, Rosemary D. Levy, Richard Bohaty, Steven M. Carter, Lionel Winkler, Aldo 2013-11 https://eprints.soton.ac.uk/360433/ English eng Florindo, Fabio, Farmer, Ryan K., Harwood, David M., Cody, Rosemary D., Levy, Richard, Bohaty, Steven M., Carter, Lionel and Winkler, Aldo (2013) Paleomagnetism and biostratigraphy of sediments from Southern Ocean ODP Site 744 (southern Kerguelen Plateau): Implications for early-to-middle Miocene climate in Antarctica. Global and Planetary Change, 110 (C), 434-454. (doi:10.1016/j.gloplacha.2013.05.004 <http://dx.doi.org/10.1016/j.gloplacha.2013.05.004>). Article PeerReviewed 2013 ftsouthampton https://doi.org/10.1016/j.gloplacha.2013.05.004 2023-07-09T21:50:32Z 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 University of Southampton: e-Prints Soton 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 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
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, ... |
format |
Article in Journal/Newspaper |
author |
Florindo, Fabio Farmer, Ryan K. Harwood, David M. Cody, Rosemary D. Levy, Richard Bohaty, Steven M. Carter, Lionel Winkler, Aldo |
spellingShingle |
Florindo, Fabio Farmer, Ryan K. Harwood, David M. Cody, Rosemary D. Levy, Richard Bohaty, Steven M. Carter, Lionel Winkler, Aldo Paleomagnetism and biostratigraphy of sediments from Southern Ocean ODP Site 744 (southern Kerguelen Plateau): Implications for early-to-middle Miocene climate in Antarctica |
author_facet |
Florindo, Fabio Farmer, Ryan K. Harwood, David M. Cody, Rosemary D. Levy, Richard Bohaty, Steven M. Carter, Lionel Winkler, Aldo |
author_sort |
Florindo, Fabio |
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 |
publishDate |
2013 |
url |
https://eprints.soton.ac.uk/360433/ |
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 |
Florindo, Fabio, Farmer, Ryan K., Harwood, David M., Cody, Rosemary D., Levy, Richard, Bohaty, Steven M., Carter, Lionel and Winkler, Aldo (2013) Paleomagnetism and biostratigraphy of sediments from Southern Ocean ODP Site 744 (southern Kerguelen Plateau): Implications for early-to-middle Miocene climate in Antarctica. Global and Planetary Change, 110 (C), 434-454. (doi:10.1016/j.gloplacha.2013.05.004 <http://dx.doi.org/10.1016/j.gloplacha.2013.05.004>). |
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 |
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1772810386383306752 |