Kan Aoike

Japan Agency for Marine-Earth Science and Technology

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Saneatsu Saito

Japan Agency for Marine-Earth Science and Technology

Masataka Kinoshita

Association for the Development of Earthquake Prediction

Asahiko Taira

Japan Agency for Marine-Earth Science and Technology

Shuichi Kodaira

Japan Agency for Marine-Earth Science and Technology

Weiren Lin

Kyoto University

Wonn Soh

Japan Agency for Marine-Earth Science and Technology

Sheng‐Rong Song

North China University of Water Resources and Electric Power

Osamu Matsubayashi

National Institute of Advanced Industrial Science and Technology

Hiroki Sone

University of Wisconsin–Madison

Masafumi Murayama

Kōchi University

Cooperative Institutions

Japan Agency for Marine-Earth Science and Technology

The University of Tokyo

Tohoku University

International Ocean Discovery Program

Kyoto University

National Institute of Advanced Industrial Science and Technology

Kōchi University

Geological Survey of Japan

Hokkaido University

Tokyo University of Marine Science and Technology

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O-277 Analysis of climate change before 160,000 year based on TOC content in marine cores drilled off the Shimokita Peninsula, northwest Pacific

日本地質学会学術大会講演要旨 (2008)

Hayato Ichikawa Akiko Uebayashi Fujio Kumon Kan Aoike

Peninsula

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Revised temperature at the updip limit of locked portion of Nankai megasplay, inferred from IODP Site C0002 temperature observatory

AGUFM (2013)

Masataka Kinoshita T. Sugihara N. Kyo Yoshiharu Namba Eiichiro Araki

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Missing Oligocene Crust of the Izu-Bonin Arc: Consumed or Rejuvenated During Collision?

Journal of Petrology (2010)

Yoshihiko Tamura Osamu Ishizuka Kan Aoike Shinichi Kawate Hiroshi Kawabata

The ∼50 Myr old Izu–Bonin–Mariana (IBM) arc consists mostly of Oligocene middle and lower crust that underlies the upper crust; these units are in turn covered by Quaternary volcanic rocks. Seismic imaging, forearc geology, Ocean Drilling Program drilling and magnetic anomalies suggest that most IBM arc crust was created in Eocene–Oligocene times. However, remnants of this old crust have never been found at the northern end of the arc, where it is colliding with the Honshu arc (Izu collision zone). Two batholiths in this collision zone (the Tanzawa tonalites and the Kofu Granitic Complex) were emplaced during the Miocene (4–17 Ma). Major elements, Zr/Y, rare earth element ratios and normalized abundance patterns, and Sr–Nd isotopic data indicate that these plutonic bodies are compositionally similar to the Oligocene IBM volcanic rocks, and that they are dissimilar to the Miocene, Pliocene and Quaternary IBM lavas and volcaniclastic rocks. We suggest that the Miocene plutonic rocks in the Izu collision zone were derived from partially melted Oligocene middle crust. A model is proposed in which IBM arc middle crust in the collision zone was partially melted during the collision and then intruded into the overlying upper crust of the Honshu and IBM arcs. This resulted in the complete loss of chronological information related to their original source.

Batholith

Volcanic arc

Forearc

Island arc

10.1093/petrology/egq002

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Citations (62)

The break-up of eastern Gondwana revealed from northern Zealandia

EGU General Assembly Conference Abstracts (2018)

Brian Boston Flora Gallais Yasuyuki Nakamura Gou Fujie Shuichi Kodaira

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