Subduction initiation and ophiolite crust: new insights from IODP drilling.

Reagan, Mark K., Pearce, Julian A., Petronotis, Katerina, Almeev, Renat R., Avery, Aaron J., Carvallo, Claire, Chapman, Timothy, Christeson, Gail L., Ferré, Eric C., Godard, Marguerite, Heaton, Daniel E., Kirchenbaur, Maria, Kurz, Walter, Kutterolf, Steffen, Li, Hongyan, Li, Yibing, Michibayashi, Katsuyoshi, Morgan, Sally, Nelson, Wendy R., Prytulak, Julie, Python, Marie, Robertson, Alastair H.F., Ryan, Jeffrey G., Sager, William W., Sakuyama, Tetsuya, Shervais, John W., Shimizu, Kenji and Whattam, Scott A. (2017) Subduction initiation and ophiolite crust: new insights from IODP drilling. International Geology Review, 59 (11). pp. 1439-1450. DOI 10.1080/00206814.2016.1276482.

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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.

Document Type: Article
Keywords: Izu, bonin, boninite, basalt, drilling, International Ocean Discovery Program, IODP Expedition 352, Site U1439, Site U1440, Site U1441, Site U1442, ophiolite, subduction initiation, Philippine plate
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1080/00206814.2016.1276482
ISSN: 0020-6814
Projects: IODP
Date Deposited: 30 Jan 2017 07:33
Last Modified: 01 Feb 2019 15:16

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