Outline of Session

Solid Earth Sciences(S) / Complex & General(CG) /  **International Session
S-CG04 Creation and Destruction of Continental Crust by Plate Tectonics


Short title Evolution of continental crust
Oral presentation
Date/Room/Chair
May 21 AM1 (09:00 - 10:30) 302 Alexander Nichols 
May 21 AM2 (10:45 - 12:15) 302 Yoshihiko Tamura 
Poster presentation
Date/Room
May 21 (Core Time 13:45 - 15:15, 17:15 - 18:30)  
Contact Yoshihiko Tamura
Email tamuray@jamstec.go.jp
Convener Yoshihiko Tamura  / Robert J. Stern  / Yoshiyuki Tatsumi 
Scope Continental crust today is mostly generated by arc magmatism above subduction zones, but also at hot-spots and rifts. Today, there are approximately 7 billion cubic kilometers of continental crust (Cogley, 1984) and it is often assumed that continental crust volume has been growing over Earth history. However, it is clear from truncations of ancient orogenic belts and the presence of >4.0 Ga zircons that much Precambrian continental crust has been destroyed, mostly by tectonic erosion at subduction zones. Moreover, lower crust foundering and decratonization might also be important destroyers of continental crust. At present, creation and destruction of continental crust is either in balance or more crust is being destroyed than created; the uncertainty comes from unknown deep losses of continental crust at collision zones and due to lower crustal foundering. This session seeks to understand how continental crust is produced and destroyed today and the recent geologic past? We ask this question to a broad range of geologists, geophysicists, geochemists and petrologists who are interested in crustal evolution.
Notes  


Time Presentation No Title Author Presenter Abstract
Oral Presentation   May 21 AM1 (09:00-10:30) 302                              to the top
09:00 - 09:30 Invited
SCG04-01
The yin and yang of continental crust creation and destruction by plate tectonic processes Robert Stern
David W Scholl
Robert Stern English
09:30 - 09:45 SCG04-02 Crustal growth along a triple plate junction: Tectonic processes and geochemical variation in the Philippine arc Maria Luisa Tejada Maria Luisa Tejada English
09:45 - 10:00 SCG04-03 Incoming Pacific Plate beneath NW Pacific Subduction Zones: Igneous Variation in Subduction Inventories Jun-Ichi Kimura
Folkmar Hauff
Naoto Hirano
other
Jun-Ichi Kimura English
10:00 - 10:15 Invited
SCG04-04
Geochemical evidence for delamination from the Jurassic Talkeetna arc crustal section: missing pyroxenites from the Moho Susan DeBari
Andrew R. Greene
Susan DeBari English
10:15 - 10:30 SCG04-05 Three primary magma types from Pagan volcano in the Mariana arc and implications for arc magma genesis Yoshihiko Tamura
Osamu Ishizuka
Robert Stern
other
Yoshihiko Tamura English
Oral Presentation   May 21 AM2 (10:45-12:15) 302                              to the top
10:45 - 11:15 Invited
SCG04-06
Ultra-deep drilling to the middle crust of the Izu-Bonin-Mariana arc: Why is this planet to be the Earth? Yoshiyuki Tatsumi Yoshiyuki Tatsumi English
11:15 - 11:30 Invited
SCG04-07
Active seismic studies in the Izu-Bonin arc and ultra-deep drilling Shuichi Kodaira
Narumi Takahashi
Takeshi Sato
Shuichi Kodaira English
11:30 - 11:45 SCG04-08 Evidence for Mesozoic basement in the Izu-Bonin-Mariana arc system Osamu Ishizuka
Kenichiro Tani
Yumiko Harigane
other
Osamu Ishizuka English
11:45 - 12:00 SCG04-09 Evidence for wehrlite and dunite xenoliths from West Zealandia Seamount, Mariana Arc, originating in the middle crust Alexander Nichols
Yoshihiko Tamura
Robert Stern
other
Alexander Nichols English
12:00 - 12:15 3-min talk in an oral session
Presentation No Title Author Presenter Abstract
SCG04-P02 Crustal reflector imaging around the Oligocene paleo arc in the Izu island arc deduced from OBS wide-angle data Takeshi Sato
Gou Fujie
Narumi Takahashi
other
Takeshi Sato English


Presentation No Title Author Presenter Abstract
Poster Presentation   May 21  Core Time (13:45-15:15, 17:15-18:30)                     to the top
SCG04-P01 Chronology and Sr isotope study for Cretaceous and Paleogene Granitic Rocks SW Japan Kazuya Iida
Hikaru Iwamori
Park Taeho
other
Kazuya Iida English
SCG04-P02 Crustal reflector imaging around the Oligocene paleo arc in the Izu island arc deduced from OBS wide-angle data Takeshi Sato
Gou Fujie
Narumi Takahashi
other
Takeshi Sato English
SCG04-P03 Paleo-arc arrangement during Eocene to Oligocene in Izu-Ogasawara forearc region revealed from seismic reflection survey Mikiya Yamashita
Narumi Takahashi
Shuichi Kodaira
other
Mikiya Yamashita English