Session Sub-categoryUnion
Session IDU-02
TitlePacific-type orogeny: From ocean to mantle
Short TitlePacific-type orogeny
Main ConvenerNameInna Safonova
AffiliationNovosibirsk State University
Co-Convener 1NameTatsuki Tsujimori
AffiliationTohoku University
Co-Convener 2NameYukio Isozaki
AffiliationDepartment of Earth Science and Astronomy, Multi-disciplinary Sciences - General Systems Studies, Graduate School of Arts and Sciences, The University of Tokyo
Co-Convener 3NameTsuyoshi Komiya
AffiliationDepartment of Earth Science & Astronomy Graduate School of Arts and Sciences The University of Tokyo
Session LanguageEE
ScopePacific-type convergent margins (ocean - continent) and their related orogenic belts exist/form over subduction zones, which are the only ways to deliver surface materials to the deep mantle. Pacific-type orogens keep records of the evolution of paleo-oceans, formation and transformation of continental crust at their active margins, and generation of hydrous-carbonated plumes in the mantle transition zone (MTZ) and its related intra-plate magmatism. An approach linking paleo-oceans, active margins and plume magmatism stands on three "whales": the model of Ocean Plate Stratigraphy (OPS), the parameters of active convergent margins and the model of hydrous-carbonated plumes. The OPS model was created by many detailed studies of western Pacific, in particular Japanese, accretionary complexes; it allows recognizing different oceanic plates within one paleo-ocean and evaluating their sizes and ages. Pacific-type convergent margins are places of major continental growth by island-arc juvenile magmatism and accretion, but they are also places of strong plate interactions and crust destruction. There are two contrast types of those margins: accreting ones accompanied by the formation of accretionary complexes, and eroding ones accompanied by the tectonic and subduction erosion of accretionary wedge, fore-arc prism and volcanic arc. The materials of oceanic and continental crust, which are eroded at Pacific-type convergent margins, can accumulate in the MTZ and affect mantle conditions. All those processes, the subduction of hydrated and carbonated oceanic crust, the destruction of continental crust at eroding margins, and the accumulation of mafic and sialic materials in the MTZ can synergistically trigger the generation of hydrous-carbonated mantle plumes in the MTZ, mantle melting and upwelling, and intra-plate continental magmatism. We welcome papers on results from Pacific-type orogenic belts worldwide and from Archean to Cenozoic ages.
Presentation FormatOral and Poster presentation
Invited Authors
  • Shigenori Maruyama (Earth-Life Science Institute, Tokyo Institute of Technology)
  • Yukio Isozaki (Department of Earth Science and Astronomy, Multi-disciplinary Sciences - General Systems Studies, Graduate School of Arts and Sciences, The University of Tokyo)
  • Eiji Ohtani (Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University)
  • Inna Safonova (Novosibirsk State University, Sobolev Institute of Geology and Mineralogy SB RAS)
  • Konstantin Litasov (V.S. Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, Russia)
  • Dapeng Zhao (Department of Geophysics, Tohoku University)
  • Min Sun (University of Hong Kong)
  • Tatsuki Tsujimori (Center for Northeast Asian Studies, Tohoku University, Department of Earth Science, Tohoku University)
Time Presentation No Title Presenter Abstract
Oral Presentation May 24 PM1
13:45 - 14:00 U02-01Systematization and importance of accretionary complex geology Shigenori Maruyama Abstract
14:00 - 14:15 U02-02Phanerozoic Pacific-rim orogenic belt (Nipponides) and CAOB (Altaides)Yukio Isozaki Abstract
14:15 - 14:30 U02-03Role of water transported into the deep mantle by subducting slabsEiji Ohtani Abstract
14:30 - 14:45 U02-04Carbonates and carbonate melts in the Earth's mantleIgor Sharygin Abstract
14:45 - 15:00 U02-05Tectonic erosion at Pacific-type convergent margins: evidence from the western Central Asian Orogenic BeltInna Safonova Abstract
15:00 - 15:15 U02-06Tectonic erosion and subduction of continental materials to mantle transition zone: The role of volatiles and heat-producing components for plume generationKonstantin Litasov Abstract
Oral Presentation May 24 PM2
15:30 - 15:45 U02-07Seismic imaging of East Asian orogens and subduction zonesDapeng Zhao Abstract
15:45 - 16:00 U02-08Five major stages for Phanerozoic accretionary processes in Japan, related to the arrangement of continents and subduction zones in East and Southeast Asia.Koji Wakita Abstract
16:00 - 16:15 U02-09Contribution of intraoceanic subduction systems to development of Eurasian continental margin in the Cretaceous: Insights from NE Japan arc.Hayato Ueda Abstract
16:15 - 16:30 U02-10The Pacific Ocean: License to kill... Cratons!Daniel Pastor-Galán Abstract
16:30 - 16:45 U02-11Prevalence of ~800 Ma magmatism in the northern part of the Central Asian orogenic belt.Uyanga Bold Abstract
16:45 - 17:00 U02-12Variation of Nd isotopic compositions for basaltic rocks of the ophiolites from the Central Asian Orogenic Belt – implication for a transition of subduction systems in the Paleozoic?Min Sun Abstract
Presentation No Title Presenter Abstract
Poster Presentation May 24 Core Time
U02-P01 Origins of Pacific arcuate archipelago and back arc concave plate,
Driving mechanism and origin of plate tectonics,Origin of Tethys Sea and India Sea
Akira Taneko Abstract
U02-P02 Geological comparison between three Eoarchean supracrustal complexes: the Isua Supracrustal Belt, southern West Greenland, Nulliak supracrustal rocks, Labrador, and Nuvvuagittuq supracrustal belt, northern Quebec Tsuyoshi Komiya Abstract
U02-P03 Lawsonitology: in-situ LA-ICPMS Sr-Pb isotope analyses Tomomi Hara Abstract
U02-P04 Nature of slab-derived fluids in Pacific-type subduction zone: Oxygen and hydrogen isotope studies of phengites from Renge and Sambagawa metasedimentary rocks Tatsuki Tsujimori Abstract
U02-P05 Zircon Hf isotopic evidences for incorporation of crustal components in early Cretaceous adakitic plutonism in the Kitakami Mountains, NE Japan Tadashi Usuki Abstract