International Ocean Discovery Program; Expedition 363 preliminary report; Western Pacific Warm Pool; Neogene and Quaternary records of Western Pacific Warm Pool paleoceanography; 6 October-8 December 2016

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doi: 10.14379/iodp.pr.363.2017
Author(s): Rosenthal, Yair; Holbourn, Ann E.; Kulhanek, Denise K.; Aiello, Ivano W.; Babila, Tali L.; Bayon, Germain; Beaufort, Luc; Bova, Samantha C.; Chun, Jong-Hwa; Dang Haowen; Drury, Anna Joy; Dunkley Jones, Tom; Eichler, Patricia P. B.; Salazar Fernando, Allan G.; Gibson, Kelly; Hatfield, Robert G.; Johnson, Daniel L.; Kumagai, Yuho; Li Tiegang; Linsley, Braddock K.; Meinicke, Niklas; Mountain, Gregory S.; Opdyke, Bradley N.; Pearson, Paul N.; Poole, Christopher R.; Ravelo, Christina; Sagawa, Takuya; Schmitt, AnaÏs; Wurtzel, Jennifer B.; Xu Jian; Yamamoto, Masanobu; Zhang, Yige
International Ocean Discovery Program, Expedition 363 Scientists, College Station, TX
Author Affiliation(s): Primary:
Rutgers University, Department of Marine and Coastal Services, New Brunswick, NJ, United States
Other:
Christian-Albrechts-Universität zu Kiel, Germany
Texas A&M University, United States
Moss Landing Marine Laboratories, United States
University of California at Santa Cruz, United States
Institut Français de Recherche pour l'Exploitation de la Mer, France
Centre Européen de Recherche et d'Enseignement de Géosciences de l'Environnement, France
Korea Institute of Geoscience and Mineral Resources, South Korea
Tongji University, China
University of Bremen, Germany
University of Birmingham, United Kingdom
Federal University of Rio Grande do Norte, Brazil
University of the Philippines, Philippines
University of South Carolina, United States
Oregon State University, United States
California Institute of Technology, United States
Tohoku University, Japan
Chinese Academy of Sciences, Institute of Oceanology, China
Lamont-Doherty Earth Observatory, United States
University of Bergen, Norway
Australian National University, Australia
Cardiff University, United Kingdom
University of College London, United Kingdom
Kanazawa University, Japan
Université de Nantes, France
Northwest University, China
Hokkaido University, Japan
Source: Preliminary Report - International Ocean Discovery Program, Vol.363, 69p. Publisher: International Ocean Discovery Program, College Station, TX, United States. ISSN: 2372-9562
Note: In English. 125 refs.
Summary: International Ocean Discovery Program Expedition 363 sought to document the regional expression and driving mechanisms of climate variability (e.g., temperature, precipitation, and productivity) in the Western Pacific Warm Pool (WPWP) as it relates to the evolution of Neogene climate on millennial, orbital, and geological timescales. To achieve our objectives, we selected sites with wide geographical distribution and variable oceanographic and depositional settings. Nine sites were cored during Expedition 363, recovering a total of 6956 m of sediment in 875-3421 m water depth with an average recovery of 101.3% during 39.6 days of on-site operations. Two sites are located off northwestern Australia at the southern extent of the WPWP and span the late Miocene to present. Seven sites are situated at the heart of the WPWP, including two sites on the northern margin of Papua New Guinea (PNG) with very high sedimentation rates spanning the past ∼450 ky, two sites in the Manus Basin north of PNG with moderate sedimentation rates recovering upper Pliocene to present sequences, and three low sedimentation rate sites on the southern and northern parts of the Eauripik Rise spanning the early Miocene to present. The wide spatial distribution of the cores, variable accumulation rates, exceptional biostratigraphic and paleomagnetic age constraints, and mostly excellent foraminifer preservation will allow us to trace the evolution of the WPWP through the Neogene at different temporal resolutions, meeting the primary objectives of Expedition 363. Specifically, the high sedimentation-rate cores off PNG will allow us to better constrain mechanisms influencing millennial-scale variability in the WPWP, their links to high-latitude climate variability, and implications for temperature and precipitation variations in this region under variable climate conditions. Furthermore, these high accumulation rates offer the opportunity to study climate variability during previous warm periods at a resolution similar to existing studies of the Holocene. With excellent recovery, Expedition 363 sites are suitable for detailed paleoceanographic reconstructions at orbital and suborbital resolution from the middle Miocene to Pleistocene, and thus will be used to refine the astronomical tuning, magneto-, isotope, and biostratigraphy of hitherto poorly constrained intervals within the Neogene timescale (e.g., the late Miocene) and to reconstruct the history of the East Asian and Australian monsoon and the Indonesian Throughflow on orbital and tectonic timescales. Results from high-resolution interstitial water sampling at selected sites will be used to reconstruct density profiles of the western equatorial Pacific deep water during the Last Glacial Maximum. Additional geochemical analyses of interstitial water samples in this tectonically active region will be used to investigate volcanogenic mineral and carbonate weathering and their possible implications for the evolution of Neogene climate.
Year of Publication: 2017
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Biostratigraphy; Boreholes; Cenozoic; Climate change; Cores; Diagenesis; Equatorial Pacific; Expedition 363; Foraminifera; IODP Site U1482; IODP Site U1483; IODP Site U1484; IODP Site U1485; IODP Site U1486; IODP Site U1487; IODP Site U1488; IODP Site U1489; IODP Site U1490; Indian Ocean; Indonesian Throughflow; Invertebrata; Lithostratigraphy; Magnetostratigraphy; Marine sediments; Microfossils; Monsoons; Nannofossils; Neogene; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Paleomagnetism; Physical properties; Plantae; Protista; Quaternary; Reconstruction; Sea water; Sea-surface temperature; Sediments; Tertiary; Well logs; West Pacific; Western Pacific Warm Pool
Coordinates: S160000 N070000 E1450000 E1180000
Record ID: 2017020804
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute.