Exhumierung von ultramafischen und hochdruckmetamorphen Gesteinen in einer juvenilen Subduktionszone: Tiefseetauch-Expedition am Omachi-Seamount im Izu-Bonin-Inselbogen
Final Report Abstract
An earlier dive with the Japanese deep sea submersible “Shinkai 6500" at the Ohmachi seamount, which is part of the Izu-Bonin-Marianas island arc system, delivered relics of amphibolites. These amphibolites were exhumed and transported to the surface together with serpentinite schists. 6 dives with the submersible wer performed to gain additional samples at the base of the Ohmachi seamount to better reveal the exhumation history and the reason for exhumation within an intraoceanic subduction zone. The applicant has been a member of the diving crew invited by the Japanese marine science organisation JAMSTEC. However, samples containing relics of eclogites were not found. This was one of the main targets of the cruise which could not be reached.
Publications
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(2008): Yk08-05 Shinkai 6500 dives at the Omachi seamount in the Bonin island arc, eastern Philippine plate. - Cruise report and preliminary results. - Jamstec, Yokosuka, Japan
Ueda, H., Ogawa, Y. Niida, K., Usuki, T., Hirauchi, K., Meschede, M., Miura, R., Yuasa, M., Sakamoto, I., Chiba, T., Izumino, T., Kuramoto, Y., Azuma, T., Takeshita, T., Imayama, T, Miyajima, Y., & Saito, T.
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Serpentinite schists in an intraoceanic island arc: exhumation by extension? - Schriftenreihe der Deutschen Gesellschaft für Geowissenschaften, Heft 60, Geo 2008, 220
Meschede, M., Ueda, H., Ogawa, Y.
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Insights into the fine-grained fraction of serpentine mud from the Southern Chamorro seamount (ODP Leg 195): A combined XRD, RFA and TEM-EDS study - EOS, Trans., Amer. Geophys. Union, 2009, suppl., T23A-1876
Lischka, M., Meschede, M., and Warr. L.N.
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Serpentinite schists in an intraoceanic island arc: exhumation by extension? - IODP-ICDP Kolloquium 2009, S. 111, Potsdam
Meschede, M., Ueda, H., Ogawa, Y.
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Serpentinite schists in an intraoceanic island arc: exhumation by extension? - Japan Geoscience Union Meeting 2009
Meschede, M., Ueda, H., Ogawa, Y.
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Serpentinite schists of the Ohmachi seamount and their possible relation to extensional plate movements of the Philippine Sea Plate - EOS, Trans., Amer. Geophys. Union, suppl., T21A-1778
Meschede, M., Ueda, H., Ogawa, Y.
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Serpentinite-eclogite complex in the Ohmachi Seamount, Izu-Bonin arc: a fossil subduction channel in the Philippine Sea plate - EOS, Trans., Amer. Geophys. Union, 2009, suppl., T32A-08
Ueda, H., Usuki, T., Hirauchi, K., Meschede, M., and Niida, K.
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Seafloor Geology of the Basement Serpentinite Body in the Ohmachi Seamount (Izu-Bonin Arc) as Exhumed Parts of a Subduction Zone Within the Philippine Sea. - in: Ogawa, Y., Anma, R. & Dilek, Y. [Hrsg.], Accretionary Prisms and Convergent Margin Tectonics in the Northwest Pacific Basin. - Modern Approaches in Solid Earth Sciences, 8: 97-128; Springer, 2011
Ueda, H., Niida, K., Usuki, T., Hirauchi, K., Meschede, M., Miura, R., Ogawa, Y., Yuasa, M., Sakamoto, I., Chiba, T., Izumino, T., Kuramoto, Y., Azuma, T., Takeshita, T., Imayama, T, Miyajima, Y., & Saito, T.
