Calcareous nannofossils from a new high-latitude PETM section; IODP Site U1514, Mentelle Basin, southeast Indian Ocean

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Author(s): LeVay, Leah J.; Edgar, Kirsty M.; Hanson, Emma M.; Bogus, Kara; Huber, Brian T.
International Ocean Discovery Program, Expedition 369 Science Party, College Station, TX
Author Affiliation(s): Primary:
International Ocean Discovery Program, College Station, TX, United States
University of Birmingham, United Kingdom
University of Exeter, United Kingdom
National Museum of Natural History, United States
Volume Title: AGU 2018 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2018; American Geophysical Union 2018 fall meeting, Washington, DC, Dec. 10-14, 2018. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: The Paleocene-Eocene Thermal Maximum (PETM) remains one of the most studied examples of transient climate warming in the Earth's past. Major biotic impacts have been recognized globally on land and in the sea, including evolutionary events, species turnover, and range extensions. These well-documented examples can provide insight into future climate warming and the effect on ecosystems. Calcareous nannofossils have been studied at several sites globally with high resolution assemblage studies and age calibrated biostratigraphic events, yet there is still uncertainty with regard to longer term impacts on the nannofossil community and the influence of more severe oceanographic changes. Newly discovered localities continue to provide important information on the event and how the Earth system and biology responded, particularly those that fill in regional gaps. International Ocean Discovery Program Site U1514 was cored during Expedition 369 in late 2017. This site is located in the Mentelle Basin between the Naturaliste Plateau and southwest Australia. Hole U1514C was rotary cored to a depth of 517 mbsf and recovered carbonate-rich ooze, claystone, and chalk. The main science objectives for this site were to obtain a continuous Cenozoic record and study the paleotemperature and oceanic anoxic events (OAEs) during the Cretaceous. Site U1514 (paleolatitude ∼54°S) provides a record of the PETM in a new region of the high southern latitudes, adding to ocean drilling sites on Maud Rise and Kerguelen Plateau. Core sections were sampled at high resolution across the event for calcareous fossils and stable isotopes. Here we present initial results of nannofossil biostratigraphy and full assemblage characterization for Site U1514 to (1) tie biostratigraphic events across ocean basins, (2) assess how and why the nannofossil assemblage was altered, (3) compare the assemblage to those documented in the Indian and Southern Oceans, and (4) study the long term impact of warming on the community.
Year of Publication: 2018
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Cenozoic; Expedition 369; IODP Site U1514; Indian Ocean; International Ocean Discovery Program; Microfossils; Nannofossils; Paleocene-Eocene Thermal Maximum; Paleoclimatology; Paleoecology; Paleogene; Tertiary
Coordinates: S330714 S330714 E1130529 E1130529
Record ID: 2019040268
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