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Symbol S (Solid Earth Sciences) » S-IT Science of the Earth's Interior & Techtonophysics

[S-IT41_28PM1] Origin, Evolution, Destruction, and Recycling of Oceanic Plate

Mon. Apr 28, 2014 2:15 PM - 4:00 PM 314 (3F)

Convener:*Tomoaki Morishita(School of Natural System, Colleage of Science and Technology, Kanazawa University), Toshitsugu Yamazaki(Atmosphere and Ocean Research Institute, The University of Tokyo), Nobukazu Seama(Department of Earth and Planetary Sciences, Graduate School of Science, Kobe University), Ryo Anma(Faculty of Life and Environmental Science, University of Tsukuba), Hidenori Kumagai(Independent Administrative Institution, Japan Agency for Marine-Earth Science and Technology), Daisuke Nakamura(Okayama University), Chair:Katsuyoshi Michibayashi(Institute of Geosciences, Shizuoka University), Ryoko Senda(Institute for Research on Earth and Evolution, Japan Agency for Marine-Earth Science and Technology)

Formation and subduction of oceanic plate play an important role in the thermochemical evolution of the Earth interior and surface environmental conditions including biological activities. However, we have never clearly answered basic questions: such as (1) Origin and modification (metamorphism and alteration coupled with biological activities) of oceanic plate before and after subduction, (2) Impact of destruction of oceanic plate on subduction zone processes, such as volcanism and earthquake, (3) Differences between mid-ocean ridge and back arc settings. In order to understand the origin, evolution and deconstruction of oceanic plate, the session invites contributions from a range of geophysics, geochemistry, petrology, modeling, simulation and biology working on intact as well as fossil oceanic lithosphere, e.g., ophiolite.

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2:15 PM - 2:30 PM

[SIT41-10] PGE abundances and Os isotope ratios of troctolites from pacific oceanic lithosphere

*Ryoko SENDA¹, Akira ISHIKAWA², Tomoaki MORISHITA³, Katsuhiko SUZUKI¹, Teruaki ISHII⁴ (1.JAMSTEC, 2.Department of Earth Science and Astronomy, The University of Tokyo, 3.School of Natural System, Colleage of Science and Technology, Kanazawa University, 4.Fukada Geological Institute)

2:30 PM - 2:45 PM

[SIT41-11] The origin for the olivine-rich troctolites from the oceanic lithosphere: remnants of a reactive MOHO

*Alessio SANFILIPPO¹, Tomoaki MORISHITA², Kaori HARA², Akihiro TAMURA², Shoji ARAI² (1.University of Pavia, Kanazawa University, 2.Kanazawa University)

2:45 PM - 3:15 PM

★ [SIT41-12] Experimental study of anelasticity of a polycrystalline material for seismological application

*Yasuko TAKEI¹, Hatsuki YAMAUCHI¹, Fumiya KARASAWA² (1.Earthquake Research Institute, Univ. of Tokyo, 2.Yahoo, Japan)

3:15 PM - 3:30 PM

[SIT41-13] Seismic structural changes in the incoming oceanic plate beneath the well-developed horst and grabens

*Gou FUJIE¹, Tsutomu TAKAHASHI¹, Shuichi KODAIRA¹, Koichiro OBANA¹, Tomoaki YAMADA² (1.JAMSTEC, 2.ERI, Univ. of Tokyo)

3:30 PM - 3:45 PM

[SIT41-14] Mafic minerals within a sediment core sampled by ABISMO in Mariana Trench

*Katsuyoshi MICHIBAYASHI¹, Naonobu TERUMINE², Yumiko HARIGANE³, Takuro NUNOURA⁴, Shigeki UEHARA¹, Yasuhiko OHARA⁵, Junichi MIYAZAKI⁴, Ken TAKAI⁴ (1.Institute of Geosciences, Shizuoka University, 2.Institute of Geosciences, Shizuoka University, 3.AIST/GSJ, 4.JAMSTEC, 5.Hydrographic and Oceanographic Department of Japan)

3:45 PM - 4:00 PM

[SIT41-15] High Ni and Mg olivine as a time recorder of chromitite P-T history

*Makoto MIURA¹, Shoji ARAI¹, Shinji YAMAMOTO², Vladimir SHMELEV³ (1.Department of Earth Sciences, Kanazawa University, 2.Department of Earth Science and Astronomy, University of Tokyo, 3.Institute of Geology and Geochemistry, Ural Brance Russian Academy of Sciences)