Japan Geoscience Union Meeting 2018

Session information

[EE] Oral

S (Solid Earth Sciences) » S-MP Mineralogy & Petrology

[S-MP36] Crust-Mantle Connections

Mon. May 21, 2018 9:00 AM - 10:30 AM A08 (Tokyo Bay Makuhari Hall)

convener:Yoshihiko Tamura(R & D Center for Ocean Drilling Science, Japan Agency for Maine-Earth Science and Technology), Osamu Ishizuka(Geological Survey of Japan, AIST), Chris Conway, Chairperson:Conway Chris, Tamura Yoshihiko(JAMSTEC)

A paradigm of the solid Earth geochemical cycles is that the Earth's crust forms by melting of the Earth's upper peridotitic mantle. A new study relates crustal thickness to magma type in the Izu-Ogasawara (Bonin) and Aleutian oceanic arcs, which suggests that continental crust (andesitic magma) is produced only when the crust is thin, thus only in oceanic arcs. How diverse is the spectrum of primary melts and which factors may contribute to its variations? What is the influence of crustal processing vs. primary magma diversity in creating the diversity of the Earth's crust? The session seeks to explore the crust-mantle connections among ophiolites, at divergent and convergent plate boundaries and within-plate (or ocean island??) settings based on volcanology, petrology, geochemistry, geophysics, geochronology, and geodynamics studies.

9:45 AM - 10:00 AM

*Yasuhiro Hirai1,2, Yoshihiko Tamura2, Kaj Hoernle3, Reinhard Werner3, Folkmar Hauff3, Christian Timm4, Takashi Miyazaki2, Bogdan Vaglarov2 (1.Graduate School of Natural Science and Technology, Kanazawa University, Japan & Japan Agency for Marine-Earth Science and Technology , 2.Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 3.GEOMAR Helmholz Centre for Ocean Research, 4.GNS Science)




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