[S-CG63] [EE] Crust-Mantle Connections / Hard-Rock Drilling

Wed. May 24, 2017 1:45 PM - 3:15 PM 104 (International Conference Hall 1F)

convener:Yoshihiko Tamura(R & D Center for Ocean Drilling Science, Japan Agency for Maine-Earth Science and Technology), Katsuyoshi Michibayashi(Institute of Geosciences, Shizuoka University), Eiichi TAKAZAWA(Department of Geology, Faculty of Science, Niigata University), Katy Jane Chamberlain(Japan Agency for Marine-Earth Science and Technology), Tomoaki Morishita(School of Natural System, Colleage of Science and Technology, Kanazawa University), Henry JB Dick(Woods Hole Oceanographic Institution), Mark K Reagan(University of Iowa), Susanne M Straub(Lamont Doherty Earth Observatory of Columbia University), Chairperson:Eiichi Takazawa(Department of Geology, Faculty of Science, Niigata University), Chairperson:Tomoaki Morishita(School of Natural System, Colleage of Science and Technology, Kanazawa University)

A number of IODP expeditions have focused on hard-rock drilling over the last decade including Expedition 352 in 2014, which drilled the volcanic sequence associated with subduction initiation in the Bonin fore-arc, and Expedition 360, which drilled the lithosphere associated with ultraslow-spreading at the Southwest Indian Ridge in 2016. In this session, we review the current status of our understanding for oceanic lithosphere and island arc formation or anything important beyond and discuss significant issue to be answered by up-coming/future hard-rock drilling. Preliminary results from the recent Expeditions are also welcome. The session also seeks to explore the crust-mantle connections among ophiolites, at divergent and convergent plate boundaries and ocean island settings. Crustal thickness and composition are correlated on ocean islands where the spatial variability in erupted magma compositions is reflected in the composition of the crust. To what extend to crustal composition reflect those of the primary melts? 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 invites contributions from interdisciplinary field ranging from geophysics, geochemistry, petrology, engineering and biology working on hard-rock cores/samples from the expeditions or any other research vessels as well as on-land geology such as ophiolites.

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1:45 PM - 2:00 PM

[SCG63-07] The Lateral Variability of the Lower Ocean Crust at an Ultraslow Spreading Ridge: Evidence for Dynamic Accretion

★Invited papers

*Henry JB Dick¹, Christopher J. MacLeod² (1.Woods Hole Oceanographic Institution, 2.Cardiff University)

2:00 PM - 2:15 PM

[SCG63-08] Geochemical and petrological interactions between felsic rocks and the host gabbros in the Oceanic Plate: An example from IODP Hole U1473A

*Du Khac Nguyen¹, Tomoaki Morishita¹, Yusuke Soda¹, Biswajit Ghosh², Yumiko Harigane³, Christopher J. MacLeod⁴, Peter Blum⁵, Henry J.B Dick⁶ (1.School of Natural System, College of Science and Technology, Kanazawa University, Japan, 2.Department of Geology, University of Calcutta, India, 3.Institute of Geology and Geoinformation, Geological Survey of Japan, 4.School of Earth and Ocean Sciences, Cardiff University, Wales, 5.International Ocean Discovery Program, Texas A&M University, USA, 6.Department of Geology and Geophysics, Woods Hole Oceanographic Institution, USA)

2:15 PM - 2:30 PM

[SCG63-09] Genesis of EPR lower crust: Petrographical and chemical evidence for mixing between MORB type and OIB type melts

*Sayantani Chatterjee¹, Marie Python¹, Marguerite Godard², Norikatsu Akizawa³ (1.Hokkaido University Department of Natural History Science Division of Earth and Planetary Systems Sciences, 2.University of Montpellier, 3.Kyoto university)

2:30 PM - 2:45 PM

[SCG63-10] ISLA ISABEL, MEXICO: A THIN CRUST UNDER A SHALLOW CONTINENTAL PLATFORM

*Román Alvarez¹, Fernando Corbo Camargo², Vsevolod Yutsis³ (1.National Autonomous University of Mexico, 2.Centro de Geociencias, UNAM, 3.Instituto Potosino de Investigación Científica y Tecnológica)

2:45 PM - 3:00 PM

[SCG63-11] Pre-existing crust and a mantle anomaly in the tectonic evolution of the South China Sea

*Maria Luisa Tejada¹, Paterno Castillo², Xiaolong Huang³, Ryoko Senda¹ (1.Department of Solid Earth Geochemistry, Japan Agency for Marine-Earth Science and Technology, 2.Scripps Institution of Oceanography University of California San Diego , 3.Guangzhou Institute of Geochemistry, Chinese Academy of Sciences)

3:00 PM - 3:15 PM

[SCG63-12] Parameterized lattice strain model for HFSE partitioning between amphibole and silicate melt with application to arc magma evolution

*Kei Shimizu¹, Yan Liang², Erik H Hauri¹ (1.Department of Terrestrial Magnetism, Carnegie Institution for Science, 2.Department of Earth, Enviornmental and Planetary Sciences, Brown University)

Session information