Articles | Volume 504S
https://doi.org/10.5194/piodp-504S-1-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/piodp-504S-1-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
IODP3 Expedition 504S “Volcanic ash on the Ontong Java Plateau: testing models of subduction reversal and wind transport in the western equatorial Pacific” Scientific Prospectus
Robert John Musgrave
CORRESPONDING AUTHOR
School of Science, University of Newcastle, Callaghan, NSW 2308, Australia
Ann Dunlea
Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
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Öykü Z. Mete, Adam V. Subhas, Heather H. Kim, Ann G. Dunlea, Laura M. Whitmore, Alan M. Shiller, Melissa Gilbert, William D. Leavitt, and Tristan J. Horner
Earth Syst. Sci. Data, 15, 4023–4045, https://doi.org/10.5194/essd-15-4023-2023, https://doi.org/10.5194/essd-15-4023-2023, 2023
Short summary
Short summary
We present results from a machine learning model that accurately predicts dissolved barium concentrations for the global ocean. Our results reveal that the whole-ocean barium inventory is significantly lower than previously thought and that the deep ocean below 1000 m is at equilibrium with respect to barite. The model output can be used for a number of applications, including intercomparison, interpolation, and identification of regions warranting additional investigation.
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Short summary
Ontong Java Plateau, the largest oceanic plateau, has played a key role in the tectonics of the Ring of Fire. Volcanic ash that fell on the plateau has the potential to test competing ideas about how plates change their motion and to record ancient wind systems. Previous scientific ocean drilling drilled cores on the plateau, but the ashes have not been analysed. Expedition 504S will sample archived cores, analyse the ash, and compare it with volcanic rocks from the nearby Solomon Islands.
Ontong Java Plateau, the largest oceanic plateau, has played a key role in the tectonics of the...