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Senda Ryoko Last modified date:2020.08.03

Associate Professor / Advanced Asian Archaeological Research Center
Department of Environmental Changes
Faculty of Social and Cultural Studies

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Undergraduate School
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 Reseacher Profiling Tool Kyushu University Pure
Academic Degree
Country of degree conferring institution (Overseas)
Field of Specialization
Geochemistry, Archaeology science
Total Priod of education and research career in the foreign country
Research Interests
  • To know the origin and records of the archaeological artifacts using geochemical methodology
    keyword : Archaeological artifact, isotope analysis
  • To understand the mantle recycling system with the view of the platinum group elements and Os isotope ratios
    keyword : Platinum group elements, Os isotope ratios, mantle
Current and Past Project
  • The overarching goal of scientific drilling in the Samail ophiolite is to understand the full spectrum of processes that create and modify oceanic crust and shallow mantle, involving mass and energy transfer between the mantle, the crust, the hydrosphere, the atmosphere and the biosphere over a range of temperatures from ~ 1350 to 20°C, depths from the surface to 10 or 20 km below the paleo-seafloor, and tectonic settings from spreading ridges to the deep ocean to surficial weathering to subduction zones.
Academic Activities
1. Ryoko Senda, Kenji Shimizu, Katsuhiko Suzuki, Ancient depleted mantle as a source of boninites in the Izu-Bonin-Mariana arc
Evidence from Os isotopes in Cr-spinel and magnetite, Chemical Geology, 10.1016/j.chemgeo.2016.06.018, 439, 110-119, 2016.11, Boninite is a volcanic rock derived from shallow melting of highly depleted hydrous mantle, fluxed with water from subducted slabs. The eruption of boninite early in the history of the Izu-Bonin-Mariana (IBM) arc (~ 48–45 Ma), suggests generation by melting of upper mantle material that was relatively unmodified by subducted components. Thus, the boninite composition should largely reflect that of the sub-arc mantle. For better understanding of the mantle sources of nascent arc settings and the contributions of different components to arc melts, we analyzed Os isotope ratios (187Os/188Os) of bulk rocks and mineral separates (euhedral Cr-spinel from boninites and euhedral Cr-spinel/magnetite mixtures from tholeiites younger than 45 Ma that erupted after boninites) from the Bonin Islands and Guam. The age-corrected (initial) Os isotope ratios of the whole-rock samples (0.1179–0.2050) were more radiogenic and variable than those of the mineral separates, possibly because of contamination with crustal materials during magma ascent or alteration after emplacement. The age-corrected Os isotope ratios of euhedral Cr-spinel in boninite from the Bonin Islands (0.1187–0.1254) and from Guam (0.1220–0.1269) are unradiogenic relative to primitive mantle, and those of the Cr-spinel/magnetite mixtures from the tholeiites from the Bonin Islands are similar to or slightly more radiogenic (0.1224–0.1382). The most depleted Os isotope ratio of the Cr-spinel from boninite yielded a model Re depletion (TRD) age of 1.4 Ga, suggesting that the mantle source of the boninite experienced melt extraction prior to 1.4 Ga. The source of the boninites is interpreted to be mostly highly depleted mantle with a small contribution of slab flux arising from altered oceanic crust that has radiogenic Os components, with or without contributions from components with relatively unradiogenic Os such as volcaniclastics of oceanic island basalt affiliation or very young mid-ocean ridge basalt..
Membership in Academic Society
  • The Geochemical Society of Japan
  • Geochemical Society
  • Japan Geoscience Union
  • American Geophysical Union
Educational Activities
I have some classes as omnibus type in Kikan and Kyoso (ISI) for the undergraduate students with Degree Project in Kyoso (ISI).
For graduate students, I have some teaching classes: Geochemistry of Earth Materials Ⅰ-Ⅳ, Comprehensive Earth Sciences B,Field Research and Practicum etc.