Explosive deep water basalt in the sumisu backarc rift

J. Gill, P. Torssander, H. Lapierre, R. Taylor, K. Kaiho, M. Koyama, M. Kusakabe, J. Aitchison, S. Cisowski, K. Dadey, K. Fujioka, A. Klaus, M. Lovell, K. Marsaglia, P. Pezard, B. Taylor, K. Tazaki

Research output: Contribution to journalArticlepeer-review

71 Citations (Scopus)


Eruption of 1-million-year-old tholeiitic basalt >1800 meters below sea level (>18 megapascals) in a backarc rift behind the Bonin arc produced a scoriaceous breccia similar in some respects to that formed during subaerial eruptions. Explosion of the magma is thought to have produced frothy agglutinate which welded either on the sea floor or in a submarine eruption column. The resulting 135-meter-thick pyroclastic deposit has paleomagnetic inclinations that are random at a scale of <2.5 meters. High magmatic water content, which is about 1.3 percent by weight after vesiculation, contributed to the explosivity.

Original languageEnglish
Pages (from-to)1214-1217
Number of pages4
Issue number4960
Publication statusPublished - 1990
Externally publishedYes

ASJC Scopus subject areas

  • General


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