Constraining early to middle Eocene climate evolution of the southwest Pacific and Southern Ocean
Studies of early Paleogene climate suffer from the scarcity of well-dated sedimentary records from the southern Pacific Ocean, the largest ocean basin during this time. We present a new magnetostratigraphic record from marine sediments that outcrop along the mid-Waipara River, South Island, New Zeal...
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2016
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Online Access: | https://escholarship.org/uc/item/6zn5g7jm https://escholarship.org/content/qt6zn5g7jm/qt6zn5g7jm.pdf https://doi.org/10.1016/j.epsl.2015.11.010 |
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ftcdlib:oai:escholarship.org:ark:/13030/qt6zn5g7jm 2024-09-15T17:44:22+00:00 Constraining early to middle Eocene climate evolution of the southwest Pacific and Southern Ocean Dallanave, Edoardo Bachtadse, Valerian Crouch, Erica M Tauxe, Lisa Shepherd, Claire L Morgans, Hugh EG Hollis, Christopher J Hines, Benjamin R Sugisaki, Saiko 2016-01-01 application/pdf https://escholarship.org/uc/item/6zn5g7jm https://escholarship.org/content/qt6zn5g7jm/qt6zn5g7jm.pdf https://doi.org/10.1016/j.epsl.2015.11.010 unknown eScholarship, University of California qt6zn5g7jm https://escholarship.org/uc/item/6zn5g7jm https://escholarship.org/content/qt6zn5g7jm/qt6zn5g7jm.pdf doi:10.1016/j.epsl.2015.11.010 public early-middle Eocene Southwest Pacific Ocean magnetostratigraphy biochronology climate evolution early Eocene climatic optimum Physical Sciences Earth Sciences Geochemistry & Geophysics article 2016 ftcdlib https://doi.org/10.1016/j.epsl.2015.11.010 2024-06-28T06:28:19Z Studies of early Paleogene climate suffer from the scarcity of well-dated sedimentary records from the southern Pacific Ocean, the largest ocean basin during this time. We present a new magnetostratigraphic record from marine sediments that outcrop along the mid-Waipara River, South Island, New Zealand. Fully oriented samples for paleomagnetic analyses were collected along 45 m of stratigraphic section, which encompasses magnetic polarity Chrons from C23n to C21n (~51.5-47 Ma). These results are integrated with foraminiferal, calcareous nannofossil, and dinoflagellate cyst (dinocyst) biostratigraphy from samples collected in three different expeditions along a total of ~80 m of section. Biostratigraphic data indicates relatively continuous sedimentation from the lower Waipawan to the upper Heretaungan New Zealand stages (i.e., lower Ypresian to lower Lutetian, 55.5 to 46 Ma). We provide the first magnetostratigraphically-calibrated age of 48.88 Ma for the base of the Heretaungan New Zealand stage (latest early Eocene). To improve the correlation of the climate record in this section with other Southern Ocean records, we reviewed the magnetostratigraphy of Ocean Drilling Program (ODP) Site 1172 (East Tasman Plateau) and Integrated Ocean Drilling Program (IODP) Site U1356 (Wilkes Land Margin, Antarctica). A paleomagnetic study of discrete samples could not confirm any reliable magnetic polarity reversals in the early Eocene at Site 1172. We use the robust magneto-biochronology of a succession of dinocyst bioevents that are common to mid-Waipara, Site 1172, and Site U1356 to assist correlation between the three records. A new integrated chronology offers new insights into the nature and completeness of the southern high-latitude climate histories derived from these sites. Article in Journal/Newspaper Antarc* Antarctica Southern Ocean Wilkes Land University of California: eScholarship Earth and Planetary Science Letters 433 380 392 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
early-middle Eocene Southwest Pacific Ocean magnetostratigraphy biochronology climate evolution early Eocene climatic optimum Physical Sciences Earth Sciences Geochemistry & Geophysics |
spellingShingle |
early-middle Eocene Southwest Pacific Ocean magnetostratigraphy biochronology climate evolution early Eocene climatic optimum Physical Sciences Earth Sciences Geochemistry & Geophysics Dallanave, Edoardo Bachtadse, Valerian Crouch, Erica M Tauxe, Lisa Shepherd, Claire L Morgans, Hugh EG Hollis, Christopher J Hines, Benjamin R Sugisaki, Saiko Constraining early to middle Eocene climate evolution of the southwest Pacific and Southern Ocean |
topic_facet |
early-middle Eocene Southwest Pacific Ocean magnetostratigraphy biochronology climate evolution early Eocene climatic optimum Physical Sciences Earth Sciences Geochemistry & Geophysics |
description |
Studies of early Paleogene climate suffer from the scarcity of well-dated sedimentary records from the southern Pacific Ocean, the largest ocean basin during this time. We present a new magnetostratigraphic record from marine sediments that outcrop along the mid-Waipara River, South Island, New Zealand. Fully oriented samples for paleomagnetic analyses were collected along 45 m of stratigraphic section, which encompasses magnetic polarity Chrons from C23n to C21n (~51.5-47 Ma). These results are integrated with foraminiferal, calcareous nannofossil, and dinoflagellate cyst (dinocyst) biostratigraphy from samples collected in three different expeditions along a total of ~80 m of section. Biostratigraphic data indicates relatively continuous sedimentation from the lower Waipawan to the upper Heretaungan New Zealand stages (i.e., lower Ypresian to lower Lutetian, 55.5 to 46 Ma). We provide the first magnetostratigraphically-calibrated age of 48.88 Ma for the base of the Heretaungan New Zealand stage (latest early Eocene). To improve the correlation of the climate record in this section with other Southern Ocean records, we reviewed the magnetostratigraphy of Ocean Drilling Program (ODP) Site 1172 (East Tasman Plateau) and Integrated Ocean Drilling Program (IODP) Site U1356 (Wilkes Land Margin, Antarctica). A paleomagnetic study of discrete samples could not confirm any reliable magnetic polarity reversals in the early Eocene at Site 1172. We use the robust magneto-biochronology of a succession of dinocyst bioevents that are common to mid-Waipara, Site 1172, and Site U1356 to assist correlation between the three records. A new integrated chronology offers new insights into the nature and completeness of the southern high-latitude climate histories derived from these sites. |
format |
Article in Journal/Newspaper |
author |
Dallanave, Edoardo Bachtadse, Valerian Crouch, Erica M Tauxe, Lisa Shepherd, Claire L Morgans, Hugh EG Hollis, Christopher J Hines, Benjamin R Sugisaki, Saiko |
author_facet |
Dallanave, Edoardo Bachtadse, Valerian Crouch, Erica M Tauxe, Lisa Shepherd, Claire L Morgans, Hugh EG Hollis, Christopher J Hines, Benjamin R Sugisaki, Saiko |
author_sort |
Dallanave, Edoardo |
title |
Constraining early to middle Eocene climate evolution of the southwest Pacific and Southern Ocean |
title_short |
Constraining early to middle Eocene climate evolution of the southwest Pacific and Southern Ocean |
title_full |
Constraining early to middle Eocene climate evolution of the southwest Pacific and Southern Ocean |
title_fullStr |
Constraining early to middle Eocene climate evolution of the southwest Pacific and Southern Ocean |
title_full_unstemmed |
Constraining early to middle Eocene climate evolution of the southwest Pacific and Southern Ocean |
title_sort |
constraining early to middle eocene climate evolution of the southwest pacific and southern ocean |
publisher |
eScholarship, University of California |
publishDate |
2016 |
url |
https://escholarship.org/uc/item/6zn5g7jm https://escholarship.org/content/qt6zn5g7jm/qt6zn5g7jm.pdf https://doi.org/10.1016/j.epsl.2015.11.010 |
genre |
Antarc* Antarctica Southern Ocean Wilkes Land |
genre_facet |
Antarc* Antarctica Southern Ocean Wilkes Land |
op_relation |
qt6zn5g7jm https://escholarship.org/uc/item/6zn5g7jm https://escholarship.org/content/qt6zn5g7jm/qt6zn5g7jm.pdf doi:10.1016/j.epsl.2015.11.010 |
op_rights |
public |
op_doi |
https://doi.org/10.1016/j.epsl.2015.11.010 |
container_title |
Earth and Planetary Science Letters |
container_volume |
433 |
container_start_page |
380 |
op_container_end_page |
392 |
_version_ |
1810491846005096448 |