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

Wed. May 24, 2017 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL7)

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.

[SCG63-P01] The earliest stage of Izu rear arc volcanism revealed by drilled cores at Site U1437, IODP Expedition 350

*Tomoki Sato¹, Takashi Miyazaki¹, Yoshihiko Tamura¹, James B. Gill², Martin Jutzeler^3,4, Ryoko Senda^5,1, Jun-Ichi Kimura¹ (1.Japan Agency for Marine-Earth Science and Technology, 2.University of California Santa Cruz, 3.National Oceanography Centre, 4.University of Tasmania, 5.Kyushu University)

[SCG63-P02] Reconstruction of proto-arc basalt lava emplacement at the Amami Sankaku Basin

*Yuki Kusano¹, Osamu Ishizuka¹, Rosemary Hickey-Vargas², Anders McCarthy³, Gene Yogodzinski⁴ (1.Geological Survey of Japan, 2.Florida International University, 3.University of Lausanne, 4.University of South Carolina)

[SCG63-P03] Forward modeling of the magma genesis for the deepest lithostratigraphic unit at Site U1437, IODP Expedition 350

*Takashi Miyazaki¹, Tomoki Sato¹, Yoshihiko Tamura¹, Jun-Ichi Kimura¹, James B Gill², Cedric Hamelin³, Kenji Horie⁴, Ryoko Senda⁵, Bogdan S. Vaglarov¹, Satoru Haraguchi¹, Qing Chang¹ (1.Japan Agency for Marine-Earth Science and Technology, 2.UCSC, 3.University of Bergen, 4.NIPR, 5.Kyushu University)

[SCG63-P04] Asthenospheric contribution to magmatism at the active rift zone in the northern Izu-Bonin arc

*Yasuhiro Hirai¹, Takanori Yoshida^1,5, Satoshi Okamura¹, Izumi Sakamoto², Ryuichi Shinjo³, Keiji Wada⁴ (1.Sapporo Campus, Hokkaido Educ. Univ., Japan, 2.Dept. Marine & Earth Sci., Tokai Univ., Japan, 3.Dept. Physics & Earth Sci., Univ. Ryukyus, Japan, 4.Asahikawa Campus, Hokkaido Educ. Univ., Japan, 5.Niki Junior High School, Hokkaido, Japan)

[SCG63-P05] Discovery of low-Ca, high-Si boninites from the northern Zambales Ophiolite: Doubly-vergent subduction initiation along Philippine Sea Plate margins

*Americus Perez¹, Susumu Umino¹, Graciano Yumul Jr.², Osamu Ishizuka³ (1.Kanazawa University, 2.Apex Mining Company Inc., 3.Geological Survey of Japan)

[SCG63-P06] Amphibolites and a garnetite: Geodynamic implications of crustal lithologies from the southeast Mariana fore-arc

*Katsuyoshi Michibayashi¹, Mark K Reagan², Yasuhiko OHARA⁵, Luan Heywood², Kathleen Goff², Thomas Foster Jr.², Brian Jicha³, Thomas Lapen⁴, William MacClelland², Minako Righter⁴, Sean Scott⁶, Kenneth Sims⁶ (1.Shizuoka University, 2.University of Iowa, 3.University of Wisconsin, 4.University of Houston, 5.Hydrographic and Oceanographic Department of Japan, 6.University of Wyoming)

[SCG63-P07] Direct evidence of hydration into mantle during shearing below a transform fault: Prince Edward transform fault, Southwest Indian Ridge

*Katsuyoshi Michibayashi¹, Kakihata Yuki¹, Henry JB Dick² (1.Institute of Geosciences, Shizuoka University, 2.Woods Hole Oceanographic Institution)

[SCG63-P08] Mantle heterogeneity under Hawaii site of M2M

*Shigeaki Ono¹ (1.Japan Agency for Marine-Earth Science and Technology)

[SCG63-P09] Petrological diversity of abyssal peridotites from the ultraslow-spreading Gakkel Ridge, Arctic Ocean

*Tomoaki Morishita¹, Yumiko Harigane², Yusuke Soda¹, Akihiro Tamura¹, Satoshi Hashimoto¹, Jonathan Snow³ (1.Kanazawa University, 2.Research Institute of Geology and Geoinformation, Geological Survey of Japan, AIST, 3.University of Houston)

[SCG63-P10] Petrological and geochemical diversity of mantle section revealed by comparison between northern and southern Oman ophiolite

*Eiichi TAKAZAWA^1,2, Keisuke ISHII³, Yuki Nomoto³, Yoshihiko Tamura² (1.Department of Geology, Faculty of Science, Niigata University, 2.R&D Center for ODS, JAMSTEC, 3.Graduate School of Science and Technology, Niigata University)

[SCG63-P11] Geochemistry of Wadi Tayin mantle section in the southern Oman mantle section with special reference to suprasubduction zone magmatism

*Keisuke ISHII¹, Eiichi TAKAZAWA^2,3, Yoshihiko Tamura³ (1.Graduate School of Science and Technology, Niigata University, 2.Department of Geology, Faculty of Science, Niigata University, 3.R&D Center for ODS, JAMSTEC)

[SCG63-P12] Arc magma-induced mantle refertalization: a case study of plagioclase peridotite in the Mineoka-Setogawa Belt, central Japan

*Yuji Ichiyama¹ (1.Chiba University)

[SCG63-P13] Role of plutonics in the generation of felsic magmas at ocean island volcanoes — Oki Dozen and Ascension Island

*Katy Jane Chamberlain¹, Jane H Scarrow^2,3, Yoshihiko Tamura¹ (1.Japan Agency for Marine-Earth Science and Technology, 2.School of Environmental Sciences, University of East Anglia, UK, 3.University of Granada, Spain)

Session information