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Title: Site U1440
Contributor(s): Reagan, M K (author); Pearce, J A (author); Petronotis, K (author); Almeev, R (author); Avery, A A (author); Carvallo, C (author); Chapman, T  (author)orcid ; Christeson, G L (author); Ferre, E C (author); Godard, M (author); Heaton, D E (author); Kirchenbaur, M (author); Kurz, W (author); Kutterolf, S (author); Li, H Y (author); Li, Y (author); Michibayashi, K (author); Morgan, S (author); Nelson, W R (author); Prytulak, J (author); Python, M (author); Robertson, A H F (author); Ryan, J G (author); Sager, W W (author); Sakuyama, T (author); Shervais, J W (author); Shimizu, K (author); Whattam, S A (author)
Publication Date: 2015-09-29
Open Access: Yes
DOI: 10.14379/iodp.proc.352.104.2015Open Access Link
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Abstract: According to the Stern and Bloomer (1992) hypothesis being tested, the Izu-Bonin-Mariana (IBM) fore arc formed during the period of seafloor spreading that accompanied the rapid rollback and sinking of the newly subducting plate immediately following subduction initiation. According to the related hypothesis of Reagan et al. (2010), the deepest volcanic rocks should primarily be fore-arc basalt (FAB), a distinctive type of volcanic rock recovered during dredging and submersible sampling of the IBM fore arc. Both hypotheses predict that FAB is underlain by sheeted dikes, as these are characteristic of crust accreted during seafloor spreading at all but the slowest spreading rates. Reconstruction of the IBM volcanic stratigraphy also provides evidence for the inference that the FAB should be overlain by the initial products of arc volcanism, specifically by Lavas with compositions that are transitional between FAB and boninite; Boninite lavas themselves; and finally, Members of the tholeiitic and calc-alkaline series typical of “normal” island arcs (Ishizuka et al., 2011). Drilling at this site provides an important test of the lower part of this sequence.
Publication Type: Book Chapter
Grant Details: ARC/LE140100047
Source of Publication: Proceedings of the International Ocean Discovery Program, v.352, p. 1-49
Publisher: International Ocean Discovery Program
Field of Research (FOR): 040304 Igneous and Metamorphic Petrology
040202 Inorganic Geochemistry
Socio-Economic Outcome Codes: 970104 Expanding Knowledge in the Earth Sciences
HERDC Category Description: B1 Chapter in a Scholarly Book
Appears in Collections:Book Chapter
School of Environmental and Rural Science

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