International Ocean Discovery Program; Expedition 371 preliminary report; Tasman Frontier subduction initiation and Paleogene climate; 27 July-26 September 2017

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doi: 10.14379/iodp.pr.371.2018
Author(s): Sutherland, Rupert; Dickens, Gerald R.; Blum, Peter; Agnini, Claudia; Alegret, Laia; Bhattacharya, Joyeeta; Bordenave, Aurelien; Chang Liao; Collot, Julien; Cramwinckel, Margot J.; Dallanave, Edoardo; Drake, Michelle K.; Etienne, Samuel J. G.; Giorgioni, Martino; Gurnis, Michael; Harper, Dustin T.; Huang, Huai-Hsuan May; Keller, Allison L.; Lam, Adriane R.; Li He; Matsui, Hiroki; Newsam, Cherry; Park, Yu-Hyeon; Pascher, Kristina M.; Pekar, Stephen F.; Penman, Donald E.; Saito, Saneatsu; Stratford, Wanda R.; Westerhold, Thomas; Zhou Xiaoli
International Ocean Discovery Program, Expedition 371 Scientists, College Station, TX
Author Affiliation(s): Primary:
Victoria University of Wellington, Department of Geography, Environment, Earth Sciences, Wellington, New Zealand
Other:
Rice University, United States
Texas A&M University, United States
Universita degli Studi di Padova, Italy
Universidad de Zaragoza, Spain
Geological Survey of New Caledonia, New Caledonia
Peking University, China
Utrecht University, Netherlands
Ludwig-Maximilians-Universität München, Germany
University of California at Santa Cruz, United States
Universidade de Brasilia, Brazil
California Institute of Technology, United States
University of Tokyo, Japan
University of California at Riverside, United States
University of Massachusetts at Amherst, United States
Chinese Academy of Sciences, Institute of Oceanology, China
Tohoku University, Japan
University College London, United Kingdom
Pusan National University, South Korea
GNS Science, New Zealand
City University of New York, Queens College, United States
Yale University, United States
Japan Agency for Marine-Earth Science and Technology, Japan
University of Bremen, Germany
Rutgers University, United States
Source: Preliminary Report - International Ocean Discovery Program, Vol.371, 44p. Publisher: International Ocean Discovery Program, College Station, TX, United States. ISSN: 2372-9562
Note: In English. 138 refs.
Summary: International Ocean Discovery Program (IODP) Expedition 371 drilled six sites in the Tasman Sea of the southwest Pacific between 27 July and 26 September 2017. The primary goal was to understand Tonga-Kermadec subduction initiation through recovery of Paleogene sediment records. Secondary goals involved understanding regional oceanography and climate since the Paleogene. Six sites were drilled, recovering 2506 m of cored sediment and volcanic rock in 36.4 days of on-site drilling during a total expedition length of 58 days. Wireline logs were collected at two sites. Shipboard observations made using cores and logs represent a substantial gain in fundamental knowledge about northern Zealandia, because only Deep Sea Drilling Project Sites 206, 207, and 208 had penetrated beneath upper Eocene strata within the region. The cored intervals at five sites (U1506-U1510) sampled nannofossil and foraminiferal ooze or chalk that contained volcanic or volcaniclastic intervals with variable clay content. Paleocene and Cretaceous sections range from more clay rich to predominantly claystone. At the final site (U1511), a sequence of abyssal clay and diatomite was recovered with only minor amounts of carbonate. The ages of strata at the base of each site were middle Eocene to Late Cretaceous, and our new results provide the first firm basis for defining formal lithostratigraphic units that can be mapped across a substantial part of northern Zealandia and related to onshore regions of New Caledonia and New Zealand. The material and data recovered during Expedition 371 enable primary scientific goals to be accomplished. All six sites provided new stratigraphic and paleogeographic information that can be put into context through regional seismic-stratigraphic interpretation and hence provide strong constraints on geodynamic models of subduction zone initiation. Our new observations can be directly related to the timing of plate deformation, the magnitude and timing of vertical motions, and the timing and type of volcanism. Secondary paleoclimate objectives were not all completed as planned, but significant new records of southwest Pacific climate were obtained.
Year of Publication: 2018
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; 18 Geophysics, Solid-Earth; Aliphatic hydrocarbons; Alkanes; Biostratigraphy; Boreholes; Cenozoic; Cores; Expedition 371; Foraminifera; Hydrocarbons; IODP Site U1506; IODP Site U1507; IODP Site U1508; IODP Site U1509; IODP Site U1510; IODP Site U1511; Igneous rocks; International Ocean Discovery Program; Lithostratigraphy; Lord Howe Rise; Marine sediments; Methane; Microfossils; Nannofossils; Organic compounds; Oxidation; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Paleogene; Plate tectonics; Sediments; South Pacific; Southwest Pacific; Subduction; Subduction zones; Tasman Sea; Tertiary; Volcanic rocks; Volcanism; West Pacific
Coordinates: S284000 S284000 E1614500 E1614500
S263000 S263000 E1663200 E1663200
S342700 S342700 E1712100 E1712100
S343900 S343900 E1655000 E1655000
S362000 S362000 E1643400 E1643400
S373400 S373400 E1602000 E1602000
Record ID: 2018077257
Copyright Information: GeoRef, Copyright 2018 American Geosciences Institute.