Chasing carbon cycle perturbations across the Paleogene and their effects on deep-sea biota; preliminary results from IODP Expedition 371, Tasman Sea

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Author(s): Alegret, Laia; Sutherland, Rupert; Dickens, Gerald R.; Blum, Peter
International Ocean Discovery Program, Expedition 371 Scientists, College Station, TX
Author Affiliation(s): Primary:
University of Zaragoza, Earth Sciences, Saragossa, Spain
Instituto Universitario de Ciencias Ambientales de Aragón, Spain
Victoria University of Wellington, New Zealand
Rice University, United States
International Ocean Discovery Program, 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: International Ocean Discovery Program (IODP) Expedition 371 sailed on the Tasman Sea in 2017 to obtain new data from a largely under-explored region, northern Zealandia. Bathyal and abyssal Paleogene sediments were recovered from six drilling sites from the Reinga Basin, New Caledonia Trough, Lord Howe Rise and the Tasman abyssal plain. These contain abundant and diverse microfossil groups that will contribute to better understand the regional stratigraphy, the subduction zone initiation in the southwest Pacific, and the climatic evolution across the Paleogene. Benthic foraminifera are the most ubiquitous microfossils in the recovered sediments, as they are present at all sites and at all paleodepths, even below the carbonate compensation depth in the Tasman abyssal plain. They provide a very continuous record through time, and are excellent tools to reconstruct climatic and environmental changes across the Paleogene, including hyperthermal events, i.e., carbon cycle perturbations associated with global warming. Despite difficulties encountered in the recovery of the most prominent hyperthermal events during the expedition, possibly due to tectonics and lithologic changes associated with warm events, some minor hyperthermals may be recognized in the cores. Preliminary results suggest that benthic foraminifera reacted to the small hyperthermals, and displayed assemblage changes that will be further compared to their response across Paleogene warming events elsewhere. The first author acknowledges the BBVA Foundation for a 2017 Leonardo Grant for Researchers and Cultural Creators. The Foundation accepts no responsibility for the statements and contents included, which are entirely the responsibility of the authors.
Year of Publication: 2018
Research Program: IODP2 International Ocean Discovery Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Carbon; Carbon cycle; Cenozoic; Expedition 371; Geochemical cycle; International Ocean Discovery Program; Pacific Ocean; Paleoecology; Paleogene; South Pacific; Southwest Pacific; Tasman Sea; Tertiary; West Pacific; Zealandia
Coordinates: S373400 S262900 E1712100 E1601800
Record ID: 2019040224
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States