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International Ocean Discovery Program Expedition 371 Preliminary Report

International Ocean Discovery Program Expedition 371 Preliminary Report
International Ocean Discovery Program Expedition 371 Preliminary Report
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.
1932-9423
Sutherland, Rupert
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Dickens, Gerald R.
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Blum, Peter
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Agnini, Claudia
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Alegret, Laia
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Bhattacharya, Joyeeta
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Bordenave, Aurelien
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Chang, Liao
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Collot, Julien
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Cramwinckel, Margot J.
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Dallanave, Edoardo
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Drake, Michelle K.
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Etienne, Samuel J.G.
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Giorgioni, Martino
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Gurnis, Michael
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Harper, Dustin T.
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Huang, Huai Hsuan May
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Keller, Allison L.
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Lam, Adriane R.
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Li, He
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Matsui, Hiroki
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Newsam, Cherry
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Park, Yu Hyeon
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Pascher, Kristina M.
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Pekar, Stephen F.
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Penman, Donald E.
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Saito, Saneatsu
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Stratford, Wanda R.
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Westerhold, Thomas
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Zhou, Xiaoli
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Sutherland, Rupert
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Dickens, Gerald R.
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Blum, Peter
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Agnini, Claudia
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Alegret, Laia
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Bhattacharya, Joyeeta
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Bordenave, Aurelien
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Chang, Liao
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Collot, Julien
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Cramwinckel, Margot J.
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Dallanave, Edoardo
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Drake, Michelle K.
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Etienne, Samuel J.G.
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Giorgioni, Martino
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Gurnis, Michael
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Harper, Dustin T.
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Huang, Huai Hsuan May
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Keller, Allison L.
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Lam, Adriane R.
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Li, He
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Matsui, Hiroki
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Newsam, Cherry
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Park, Yu Hyeon
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Pascher, Kristina M.
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Pekar, Stephen F.
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Penman, Donald E.
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Saito, Saneatsu
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Stratford, Wanda R.
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Westerhold, Thomas
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Zhou, Xiaoli
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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 and Zhou, Xiaoli (2018) International Ocean Discovery Program Expedition 371 Preliminary Report. Integrated Ocean Drilling Program: Preliminary Reports, (371). (doi:10.14379/iodp.pr.371.2018).

Record type: Article

Abstract

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.

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Published date: January 2018

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Local EPrints ID: 443360
URI: http://eprints.soton.ac.uk/id/eprint/443360
ISSN: 1932-9423
PURE UUID: ddf6c4a6-72bd-4e79-8b5e-110d4f727a15
ORCID for Margot J. Cramwinckel: ORCID iD orcid.org/0000-0002-6063-836X

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Date deposited: 21 Aug 2020 16:30
Last modified: 16 Mar 2024 09:01

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Contributors

Author: Rupert Sutherland
Author: Gerald R. Dickens
Author: Peter Blum
Author: Claudia Agnini
Author: Laia Alegret
Author: Joyeeta Bhattacharya
Author: Aurelien Bordenave
Author: Liao Chang
Author: Julien Collot
Author: Margot J. Cramwinckel ORCID iD
Author: Edoardo Dallanave
Author: Michelle K. Drake
Author: Samuel J.G. Etienne
Author: Martino Giorgioni
Author: Michael Gurnis
Author: Dustin T. Harper
Author: Huai Hsuan May Huang
Author: Allison L. Keller
Author: Adriane R. Lam
Author: He Li
Author: Hiroki Matsui
Author: Cherry Newsam
Author: Yu Hyeon Park
Author: Kristina M. Pascher
Author: Stephen F. Pekar
Author: Donald E. Penman
Author: Saneatsu Saito
Author: Wanda R. Stratford
Author: Thomas Westerhold
Author: Xiaoli Zhou

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