Subduction initiation and ophiolite crust: new insights from IODP drilling

Mark K. Reagan, Julian A. Pearce, Katerina Petronotis, Renat R. Almeev, Aaron J. Avery, Claire Carvallo, Timothy Chapman, Gail L. Christeson, Eric C. Ferré, Marguerite Godard, Daniel E. Heaton, Maria Kirchenbaur, Walter Kurz, Steffen Kutterolf, Hongyan Li, Yibing Li, Katsuyoshi Michibayashi, Sally Morgan, Wendy R. Nelson, Julie PrytulakMarie Python, Alastair H.F. Robertson, Jeffrey G. Ryan, William W. Sager, Tetsuya Sakuyama, John W. Shervais, Kenji Shimizu, Scott A. Whattam

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

International Ocean Discovery Program (IODP) Expedition 352 recovered a high-fidelity record of volcanism related to subduction initiation in the Bonin fore-arc. Two sites (U1440 and U1441) located in deep water nearer to the trench recovered basalts and related rocks; two sites (U1439 and U1442) located in shallower water further from the trench recovered boninites and related rocks. Drilling in both areas ended in dolerites inferred to be sheeted intrusive rocks. The basalts apparently erupted immediately after subduction initiation and have compositions similar to those of the most depleted basalts generated by rapid sea-floor spreading at mid-ocean ridges, with little or no slab input. Subsequent melting to generate boninites involved more depleted mantle and hotter and deeper subducted components as subduction progressed and volcanism migrated away from the trench. This volcanic sequence is akin to that recorded by many ophiolites, supporting a direct link between subduction initiation, fore-arc spreading, and ophiolite genesis.

Original languageEnglish
Pages (from-to)1439-1450
Number of pages12
JournalInternational Geology Review
Volume59
Issue number11
DOIs
Publication statusPublished - 2017 Aug 18

Keywords

  • Expedition 352
  • International Ocean Discovery Program
  • Izu
  • Philippine plate
  • Site U1439
  • Site U1440
  • Site U1441
  • Site U1442
  • basalt
  • bonin
  • boninite
  • drilling
  • ophiolite
  • subduction initiation

ASJC Scopus subject areas

  • Geology

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  • Cite this

    Reagan, M. K., Pearce, J. A., Petronotis, K., Almeev, R. R., Avery, A. J., Carvallo, C., Chapman, T., Christeson, G. L., Ferré, E. C., Godard, M., Heaton, D. E., Kirchenbaur, M., Kurz, W., Kutterolf, S., Li, H., Li, Y., Michibayashi, K., Morgan, S., Nelson, W. R., ... Whattam, S. A. (2017). Subduction initiation and ophiolite crust: new insights from IODP drilling. International Geology Review, 59(11), 1439-1450. https://doi.org/10.1080/00206814.2016.1276482