Site U1439
2015; Linguagem: Inglês
10.14379/iodp.proc.352.103.2015
ISSN2377-3189
AutoresMark K. Reagan, Julian A. Pearce, Katerina Petronotis, Renat Almeev, A.A. Avery, Claire Carvallo, Timothy Chapman, Gail Christeson, Eric C. Ferré, Marguerite Godard, Daniel E. Heaton, Maria Kirchenbaur, Walter Kurz, Steffen Kutterolf, H.Y. Li, Y. Li, Katsuyoshi Michibayashi, Sally Morgan, Wendy R. Nelson, Julie Prytulak, Marie Python, Alastair H.F. Robertson, Jeffrey G. Ryan, William W. Sager, Tetsuya Sakuyama, John W. Shervais, Kenji Shimizu, Scott Whattam,
Tópico(s)Hydrocarbon exploration and reservoir analysis
ResumoOur accomplishments toward Objectives 1 and 2 further address how the mantle responds to subduction initiation.For example, existing data indicate that initiation of the arc is marked by influx of more depleted mantle or by remelting of mantle already depleted beneath the oceanic ridge that produced the FAB.Lava compositions allow us to monitor the changes in mantle depletion and degree of melting with time and so construct more realistic geodynamic and petrologic models. Test the hypothesis that the forearc lithosphere created duringsubduction initiation is the birthplace of suprasubduction zone ophiolites.Results from drilling at Site U1439 allow us to illustrate a detailed volcanic chemostratigraphy expected for subduction initiation, especially in the part of the sequence formed by the transition from spreading to arc volcanism.This, in turn, allows more detailed comparisons with ophiolites where boninite overlies basalt, such as Pindos in Greece, Mirdita in Albania, Semail in Oman, and Troodos in Cyprus, as well as ophiolites overlain by, or associated with, more complex arc-like sequences such as the Coast Range ophiolite in California or Baie Verte in Newfoundland. Operations Transit to Site U1439The R/V JOIDES Resolution left Yokohama, Japan, at 1100 h (all times are ship local time, which is UTC + 9 h) on the morning of 4
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