Expedition 371 summary

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doi: 10.14379/iodp.proc.371.101.2019
Author(s): Sutherland, Rupert; Dickens, Gerald R.; Blum, Peter; Agnini, Claudia; Alegret, Laia; Asatryan, Gayane; 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; Morgans, H. E. G.; 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, New Zealand
Other:
Rice University, United States
Texas A&M University, United States
Universita degli Studi di Padova, Italy
Universidad de Zaragoza, Spain
University of Queensland, Australia
Geological Survey of New Caledonia, New Caledonia
Peking University, China
Utrecht University, Netherlands
Volume Title: Proceedings of the International Ocean Discovery Program; Tasman frontier subduction initiation and Paleogene climate; Expedition 371 of the R/V JOIDES Resolution, Townsville, Australia, to Hobart, Australia; Sites U1506-U1511, 27 July-26 September 2017
Volume 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 J.; 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
Source: Proceedings of the International Ocean Discovery Program; Tasman frontier subduction initiation and Paleogene climate; Expedition 371 of the R/V JOIDES Resolution, Townsville, Australia, to Hobart, Australia; Sites U1506-U1511, 27 July-26 September 2017, Rupert Sutherland, Gerald R. Dickens, Peter Blum, Claudia Agnini, Laia Alegret, Joyeeta Bhattacharya, Aurelien Bordenave, Chang Liao, Julien Collot, Margot J. Cramwinckel, Edoardo Dallanave, Michelle K. Drake, Samuel J. G. Etienne, Martino Giorgioni, Michael Gurnis, Dustin T. Harper, Huai-Hsuan May Huang, Allison J. Keller, Adriane R. Lam, Li He, Hiroki Matsui, Cherry Newsam, Yu-Hyeon Park, Kristina M. Pascher, Stephen F. Pekar, Donald E. Penman, Saneatsu Saito, Wanda R. Stratford, Thomas Westerhold and Xiaoli Zhou; International Ocean Discovery Program, Expedition 371 Scientists, College Station, TX. Proceedings of the International Ocean Discovery Program, Expedition Reports, Vol.371, 33p. Publisher: International Ocean Discovery Program, Washington, DC, United States. ISSN: 2377-3189 CODEN: IDSDA6
Note: In English. 170 refs.; illus., incl. sects., 1 table, geol. sketch maps
Summary: International Ocean Discovery Program (IODP) Expedition 371 drilled six sites (U1506-U1511) in the Tasman Sea, 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 were to understand regional oceanography and climate through intervals of the Cenozoic, especially the Eocene. We recovered 2506 m of cored sediment and volcanic rock in 36.4 days of on-site drilling over a total expedition length of 58 days. The ages of strata at the base of each site were middle Eocene to Late Cretaceous. The cored intervals at five sites (U1506-U1510) sampled mostly nannofossil and foraminiferal ooze or chalk that contained volcanic or volcaniclastic intervals with variable clay content. Paleocene and Cretaceous sections at Site U1509 also contain calcareous clay and claystone. At Site U1511, a sequence of abyssal clay and diatomite was recovered with only minor amounts of carbonate. Wireline logs were collected at Sites U1507 and U1508. Our results provide the first firm basis for correlating lithostratigraphic units across a substantial part of northern Zealandia, including ties to onshore geology in New Caledonia and New Zealand. All six sites provide new stratigraphic and paleogeographic information that can be put into context through regional seismic stratigraphic interpretation and hence provide constraints on geodynamic models of subduction zone initiation. Evidence from Site U1507 suggests the northern New Caledonia Trough formed during an early stage of Paleogene tectonic change (before 44 Ma). Paleowater depth estimates from Site U1509 indicate that the Cretaceous Fairway-Aotea-Taranaki Basin dramatically deepened (∼2000 m) at a similar time. Northern Lord Howe Rise at Site U1506 rose to sea level at ∼50 Ma and subsided back to bathyal depths (600-1000 m) by 45 Ma. In contrast, southern Lord Howe Rise, at least near Site U1510, experienced its peak of transient uplift at ∼40-30 Ma. A pulse of convergent plate failure took place across the southern part of the region (Sites U1508-U1511) between 45 and 35 Ma. Uplift of Lord Howe Rise was associated with intraplate volcanism, whereas volcanic activity on Norfolk Ridge near Site U1507 started at ∼38 Ma and may relate to subduction. Shipboard observations made using cores and logs represent a substantial gain in fundamental knowledge about northern Zealandia. Prior to Expedition 371, only Deep Sea Drilling Project Sites 206, 207, and 208 had penetrated beneath upper Eocene strata in the region. Our samples and results provide valuable new constraints on geodynamic models of subduction initiation because they reveal the timing of plate deformation, the magnitude and timing of vertical motions, and the timing and type of volcanism. Secondary drilling objectives focused on paleoclimate topics were not fully completed, but significant new records were obtained that should contain information on Cenozoic oceanography and climate in the southwest Pacific.
Year of Publication: 2019
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; 20 Geophysics, Applied; Arthropoda; Biostratigraphy; Boreholes; Cenozoic; Chemostratigraphy; Coral Sea; Cores; Correlation; Crustacea; Depositional environment; Dinoflagellata; Downhole methods; Expedition 371; Foraminifera; Geophysical methods; Geophysical surveys; IODP Site U1506; IODP Site U1507; IODP Site U1508; IODP Site U1509; IODP Site U1510; IODP Site U1511; Igneous rocks; International Ocean Discovery Program; Lithofacies; Lithostratigraphy; Lord Howe Rise; Magnetostratigraphy; Mandibulata; Marine environment; Microfossils; Nannofossils; Ostracoda; Pacific Ocean; Palynomorphs; Physical properties; Quaternary; Radiolaria; Sedimentary rocks; South Pacific; Southwest Pacific; Surveys; Tasman Sea; Tertiary; Volcanic rocks; Well logs; West Pacific; X-ray diffraction data
Coordinates: S283943 S283943 E1614425 E1614425
S262919 S262919 E1663143 E1663143
S342654 S342654 E1712036 E1712036
S343908 S343908 E1654940 E1654940
S361944 S361944 E1643332 E1643332
S373340 S373340 E1601856 E1601856
Record ID: 2019012133
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.