Proceedings of the International Ocean Drilling Programme
Proceedings of the International Ocean Drilling Programme
Proceedings of the International Ocean Drilling Programme
Articles | Volume 504S
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.
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.
Articles | Volume 504S
Scientific prospectus
 | 
29 Apr 2026
Scientific prospectus |  | 29 Apr 2026

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 and Ann Dunlea

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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.
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IODP3 Expedition 504S: Volcanic ash on the Ontong...