Articles | Volume 504S
https://doi.org/10.5194/piodp-504S-1-2026
https://doi.org/10.5194/piodp-504S-1-2026
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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Cited articles

Almeida, J., Rielm, N., Rosas, F. M., Duarte, J. C., and Schellart, W. P.: Polarity-reversal subduction zone initiation triggered by buoyant plateau subduction, Earth Planet. Sc. Lett., 577, 117195, https://doi.org/10.1016/j.epsl.2021.117195, 2022. 
An, Z.: The history and variability of the East Asian paleomonsoon climate, Quaternary Sci. Rev., 19, 171–187, https://doi.org/10.1016/S0277-3791(99)00060-8, 2000. 
Anderson, C. H., Murray, R. W., Dunlea, A. G., Giosan, L., Kinsley, C. W., McGee, D., and Tada, R.: Aeolian delivery to Ulleung Basin, Korea (Japan Sea), during development of the East Asian Monsoon through the last 12 Ma, Geol. Mag., 362, 1–12, https://doi.org/10.1017/S001675681900013X, 2019. 
Berger, W. H., Kroenke, L. W., Mayer, L. A., and Shipboard Scientific Party: Ontong Java Plateau, Leg 130: Synopsis of major drilling results, in: Proceedings of the Ocean Drilling Program, Initial Reports, edited by: Kroenke, L. W., Berger, W. H., Janecek, T. R., et al., Texas A & M University, Ocean Drilling Program, College Station, TX, United States, 192, 497–537, https://doi.org/10.2973/odp.proc.ir.192.2001, 1991. 
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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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