Age Assessment of Eocene-Pliocene Drill Cores Recovered During the SHALDRIL II Expedition, Antarctic Peninsula
© 2011 by the American Geophysical Union. Pre-Quaternary strata were recovered from four sites on the continental shelf of the eastern Antarctic Peninsula during the SHALDRIL II cruise, NBP0602A (March-April 2006). Fully marine shelf sediments characterize these short cores and contain a mixture of...
Main Authors: | , , , , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
LSU Scholarly Repository
2013
|
Subjects: | |
Online Access: | https://repository.lsu.edu/geo_pubs/1057 https://doi.org/10.1029/2010SP001049 |
id |
ftlouisianastuir:oai:repository.lsu.edu:geo_pubs-2056 |
---|---|
record_format |
openpolar |
spelling |
ftlouisianastuir:oai:repository.lsu.edu:geo_pubs-2056 2024-09-15T17:48:09+00:00 Age Assessment of Eocene-Pliocene Drill Cores Recovered During the SHALDRIL II Expedition, Antarctic Peninsula Bohaty, Steven M. Kulhanek, Denise K. Wise, Sherwood W. Jemison, Kelly Warny, Sophie Sjunneskog, Charlotte 2013-03-21T07:00:00Z https://repository.lsu.edu/geo_pubs/1057 https://doi.org/10.1029/2010SP001049 unknown LSU Scholarly Repository https://repository.lsu.edu/geo_pubs/1057 doi:10.1029/2010SP001049 Faculty Publications Antarctic Peninsula Biostratigraphy Calcareous nannofossils Diatoms SHALDRIL Strontium isotopes text 2013 ftlouisianastuir https://doi.org/10.1029/2010SP001049 2024-08-08T04:27:15Z © 2011 by the American Geophysical Union. Pre-Quaternary strata were recovered from four sites on the continental shelf of the eastern Antarctic Peninsula during the SHALDRIL II cruise, NBP0602A (March-April 2006). Fully marine shelf sediments characterize these short cores and contain a mixture of opaline, carbonate-walled, and organic-walled microfossils, suitable for both biostratigraphic and paleoenvironmental studies. Here we compile biostratigraphic information and provide age assessments for the Eocene-Pliocene intervals of these cores, based primarily on diatom biostratigraphy with additional constraints from calcareous nannofossil and dinoflagellate cyst biostratigraphy and strontium isotope dating. The Eocene and Oligocene diatom floras are illustrated in nine figures. A late Eocene age (37-34 Ma) is assigned to strata recovered in Hole 3C, and a late Oligocene age (28.4-23.3 Ma) is determined for strata recovered in Hole 12A. Middle Miocene (12.8-11.7 Ma) and early Pliocene (5.1-4.3 Ma) ages are assigned to the sequence recovered in holes 5C and 5D, and an early Pliocene age (5.1-3.8 Ma) is interpreted for cores recovered in holes 6C and 6D. These ages provide chronostratigraphic ground truthing for the thick sequences of Paleogene and Neogene strata present on the northwestern edge of the James Ross Basin and on the northeastern side of the Joinville Plateau, as interpreted from a network of seismic stratigraphic survey lines in the drilling areas. Although representing a coarse-resolution sampling of the complete sedimentary package, the well-constrained ages for these cores also allow for the broad reconstruction of marine and terrestrial paleoenvironments in the Antarctic Peninsula for the late Eocene-to-early Pliocene time interval. Text Antarc* Antarctic Antarctic Peninsula LSU Digital Commons (Louisiana State University) 63 113 |
institution |
Open Polar |
collection |
LSU Digital Commons (Louisiana State University) |
op_collection_id |
ftlouisianastuir |
language |
unknown |
topic |
Antarctic Peninsula Biostratigraphy Calcareous nannofossils Diatoms SHALDRIL Strontium isotopes |
spellingShingle |
Antarctic Peninsula Biostratigraphy Calcareous nannofossils Diatoms SHALDRIL Strontium isotopes Bohaty, Steven M. Kulhanek, Denise K. Wise, Sherwood W. Jemison, Kelly Warny, Sophie Sjunneskog, Charlotte Age Assessment of Eocene-Pliocene Drill Cores Recovered During the SHALDRIL II Expedition, Antarctic Peninsula |
topic_facet |
Antarctic Peninsula Biostratigraphy Calcareous nannofossils Diatoms SHALDRIL Strontium isotopes |
description |
© 2011 by the American Geophysical Union. Pre-Quaternary strata were recovered from four sites on the continental shelf of the eastern Antarctic Peninsula during the SHALDRIL II cruise, NBP0602A (March-April 2006). Fully marine shelf sediments characterize these short cores and contain a mixture of opaline, carbonate-walled, and organic-walled microfossils, suitable for both biostratigraphic and paleoenvironmental studies. Here we compile biostratigraphic information and provide age assessments for the Eocene-Pliocene intervals of these cores, based primarily on diatom biostratigraphy with additional constraints from calcareous nannofossil and dinoflagellate cyst biostratigraphy and strontium isotope dating. The Eocene and Oligocene diatom floras are illustrated in nine figures. A late Eocene age (37-34 Ma) is assigned to strata recovered in Hole 3C, and a late Oligocene age (28.4-23.3 Ma) is determined for strata recovered in Hole 12A. Middle Miocene (12.8-11.7 Ma) and early Pliocene (5.1-4.3 Ma) ages are assigned to the sequence recovered in holes 5C and 5D, and an early Pliocene age (5.1-3.8 Ma) is interpreted for cores recovered in holes 6C and 6D. These ages provide chronostratigraphic ground truthing for the thick sequences of Paleogene and Neogene strata present on the northwestern edge of the James Ross Basin and on the northeastern side of the Joinville Plateau, as interpreted from a network of seismic stratigraphic survey lines in the drilling areas. Although representing a coarse-resolution sampling of the complete sedimentary package, the well-constrained ages for these cores also allow for the broad reconstruction of marine and terrestrial paleoenvironments in the Antarctic Peninsula for the late Eocene-to-early Pliocene time interval. |
format |
Text |
author |
Bohaty, Steven M. Kulhanek, Denise K. Wise, Sherwood W. Jemison, Kelly Warny, Sophie Sjunneskog, Charlotte |
author_facet |
Bohaty, Steven M. Kulhanek, Denise K. Wise, Sherwood W. Jemison, Kelly Warny, Sophie Sjunneskog, Charlotte |
author_sort |
Bohaty, Steven M. |
title |
Age Assessment of Eocene-Pliocene Drill Cores Recovered During the SHALDRIL II Expedition, Antarctic Peninsula |
title_short |
Age Assessment of Eocene-Pliocene Drill Cores Recovered During the SHALDRIL II Expedition, Antarctic Peninsula |
title_full |
Age Assessment of Eocene-Pliocene Drill Cores Recovered During the SHALDRIL II Expedition, Antarctic Peninsula |
title_fullStr |
Age Assessment of Eocene-Pliocene Drill Cores Recovered During the SHALDRIL II Expedition, Antarctic Peninsula |
title_full_unstemmed |
Age Assessment of Eocene-Pliocene Drill Cores Recovered During the SHALDRIL II Expedition, Antarctic Peninsula |
title_sort |
age assessment of eocene-pliocene drill cores recovered during the shaldril ii expedition, antarctic peninsula |
publisher |
LSU Scholarly Repository |
publishDate |
2013 |
url |
https://repository.lsu.edu/geo_pubs/1057 https://doi.org/10.1029/2010SP001049 |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_source |
Faculty Publications |
op_relation |
https://repository.lsu.edu/geo_pubs/1057 doi:10.1029/2010SP001049 |
op_doi |
https://doi.org/10.1029/2010SP001049 |
container_start_page |
63 |
op_container_end_page |
113 |
_version_ |
1810289291112218624 |