Updated on 2025/05/09

写真a

 
NAGAYA, Takayoshi
 
Affiliation
Faculty of Education and Integrated Arts and Sciences, School of Education
Job title
Associate Professor
Degree
PhD ( 2016.03 Nagoya University )
Mail Address
メールアドレス
Homepage URL
https://w-rdb.waseda.jp/html/100004383_en.html
Profile

研究室ウェブサイト: https://struct-geosci.w.waseda.jp/

Laboratory website: https://struct-geosci.w.waseda.jp/en/

Research Experience

  • 2025.04
    -
    Now

    Waseda University   Department of Earth Sciences, Department of Science, School of Education, Faculty of Education and Integrated Arts and Sciences   Associate Professor

  • 2023.10
    -
    Now

    The University of Tokyo   Graduate School of Science   Guest Researcher

  • 2025.04
    -
    2025.09

    Tokyo Gakugei University   Faculty of Education   Part-time Lecturer

  • 2023.04
    -
    2025.03

    Tokyo Gakugei University   Department of Environmental Science, Broad-Scope Natural Sciences, Natural Sciences Division, Faculty of Education   Lecturer

  • 2019.09
    -
    2023.03

    The University of Tokyo   School of Science   Assistant Professor

  • 2019.04
    -
    2019.08

    University of Southern California   Dornsife College of Letters, Arts and Sciences   JSPS Overseas Research Fellow

  • 2017.10
    -
    2019.08

    University of Southern California   Dornsife College of Letters, Arts and Sciences   Post-Doctoral Scholar–Visiting Fellow

  • 2016.04
    -
    2019.03

    Tohoku University   Graduate School of Environmental Studies   Japan Society for the Promotion of Science (JSPS) Postdoctoral Research Fellow (PD)

  • 2015.09
    -
    2016.03

    Aichi Institute of Technology   Center for General Education   Part-time Lecturer

  • 2013.04
    -
    2016.03

    Nagoya University   Graduate School of Environmental Studies   Japan Society for the Promotion of Science (JSPS) Research Fellow (DC1)

  • 2014.09
    -
    2015.03

    Aichi Institute of Technology   Center for General Education   Part-time Lecturer

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Education Background

  • 2013.04
    -
    2016.03

    Nagoya University   Graduate School of Environmental Studies   Department of Earth and Planetary Sciences  

  • 2011.04
    -
    2013.03

    Nagoya University   Graduate School of Environmental Studies   Department of Earth and Planetary Sciences  

  • 2007.04
    -
    2011.03

    Osaka Prefecture University   School of Science   Department of Physical Science  

Committee Memberships

  • 2024
    -
    2025

    Japan Association of Mineralogical Sciences (JAMS)  Research Presentation Excellence Award Selection Committee: Member

  • 2019.11
    -
    2023.12

    The 17th International Symposium on Water-Rock Interaction (WRI-17) organizing committee  Local organizing committee

  • 2021
    -
    2022

    The Geological Society of Japan (GSJ)  Election Administration Committee member

  • 2021
    -
    　

    Metamorphic etc Symposium 2021  Virtual Organizing Committee

  • 2017
    -
    　

    Metamorphic etc Symposium 2017 & 14th International Symposium on Water Dynamics Joint meeting  organizing committee

Professional Memberships

  • 2014
    -
    Now

    The Seismological Society of Japan (SSJ)

  • 2012
    -
    Now

    The Geological Society of Japan (GSJ)

  • 2012
    -
    Now

    Japan Association of Mineralogical Sciences (JAMS)

  • 2012
    -
    Now

    Japan Geoscience Union

  • 2020
    -
    2022

    Asia Oceania Geosciences Society (AOGS)

  • 2018
    　
    　

    American Geophysical Union (AGU)

  • 2016
    　
    　

    American Geophysical Union (AGU)

  • 2014
    　
    　

    American Geophysical Union (AGU)

  • 2014
    　
    　

    The European Geosciences Union (EGU)

  • 2012
    　
    　

    American Geophysical Union (AGU)

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Research Areas

  • Solid earth sciences

Research Interests

  • Solid Earth Physics, Structural Seismology, Subduction Zone, Upper Mantle, Continental Crust, Rock Structure, Seismic Anisotropy

  • Geoscience education, rock and mineral specimens, large-scale language models, generative AI

  • Interior Earth Materials Science, Structural Geology, Petrology, Metamorphic Rocks, Serpentinite, Mineral Physics

  • EBSD, XRD, Raman spectroscopy, EPMA, SEM

Awards

  • Geological Society of JapanStudent Outstanding Presentation Award

    2024.09   The Geological Society of Japan (GSJ)   Estimation of maximum shear stress along the subduction plate interface and reexamination of subduction zone thermal modeling: example from the Late Cretaceous Sambagawa subduction zone

    Winner： Yukinojo KOYAMA, Simon WALLIS, Takayoshi NAGAYA, Mutsuki AOYA

  • Japan Association of Mineralogical Sciences Student Presentation Award

    2024.09   Japan Association of Mineralogical Sciences (JAMS)   Toward the establishment of "EBSD method for the detection of quartz with phase transition to coesite": Incorporation of the Gongen area, Sanbagawa metamorphic belt, Shikoku, SW-Japan

    Winner： Momoko Minowa, Takayoshi Nagaya, Taisuke Ito, Simon Wallis

  • Geological Society of JapanStudent Outstanding Presentation Award

    2023.09   The Geological Society of Japan (GSJ)   Serpentinization and Contact metamorphism processes based on spatial variation of mineral combinations in ultramafic rocks of the Sanbagawa Belt, Ina area, Nagano Prefecture, Japan

    Winner： Kaho NOBUHARA, Yurie TSUKISHIMA, Hiroshi MORI, Takayoshi NAGAYA, Takafumi SHINYA, Yuho HAYAKAWA

  • Geological Society of JapanExcellent Poster Award

    2017.09   The Geological Society of Japan (GSJ)   Nucleation of 10 μm-scale olivine grains in chlorite peridotite due to dynamicrecrystallization

    Winner： Komai, M., Mizukami, T., Arai, T., Nagaya, T. & Wallis, S.

  • Geological Society of JapanExcellent Poster Award

    2015.09   The Geological Society of Japan (GSJ)   Petrological and field evidence for the importance of brucite in the shallow mantle wedge of the Sanbagawa subduction zone

    Winner： Kawahara, H., Endo, S., Wallis, S., Nagaya, T., Mori, H., Yamamoto, K, & Asahara, Y.

  • Japan Geoscience Union (JpGU) Meeting 2015 Outstanding Student Presentation Award (OSPA)

    2015.05   Japan Geoscience Union (JpGU)   S-wave ray path analysis constrains the distribution and dynamics of the hydrated mantle wedge

    Winner： Takayoshi Nagaya, Simon Wallis, Andrew Walker, James Wookey & Michael Kendall

    　View Summary

    https://confit.atlas.jp/guide/event-img/jpgu2015/01345/public/pdf?type=in

  • Geological Society of JapanExcellent Poster Award

    2014.09   The Geological Society of Japan (GSJ)   Constraints on Time-scales for Graphitization of Carbonaceous Material

    Winner： Mori, H., Mori, N., Wallis, S., Annen, C., Westaway, R., Caricchi, L., Kouketsu, Y. & Nagaya, T.

  • Geological Society of JapanExcellent Poster Award

    2014.09   The Geological Society of Japan (GSJ)   Interactions between the shallow wedge mantle and subducted slab ~ the Shiraga ultramaficbody, Kochi prefecture ~

    Winner： Kawahara, H., Nagaya, T., Mori, H. & Wallis, S.

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Papers

  • Detailed Occurrence of Feather Features in Quartz in Experimentally Shocked Granite

    Toshihiro Tada, Kosuke Kurosawa, Naotaka Tomioka, Takayoshi Nagaya, Junko Isa, Christopher Hamann, Haruka Ono, Takafumi Niihara, Takaya Okamoto and Takafumi Matsui

    Journal of Geophysical Research: Planets    2024.10  [Refereed]

    DOI

  • Progressive change in dislocation microstructures in shocked calcite with pressure: Characterization of micrometeoroid bombardment on asteroid Ryugu

    Naotaka Tomioka, Kosuke Kurosawa, Akira Miyake, Yohei Igami, Takayoshi Nagaya, Takaaki Noguchi, Toru Matsumoto, Masaaki Miyahara, Yusuke Seto

    American Mineralogist    2024.09  [Refereed]

    　View Summary

    <jats:title>Abstract</jats:title>
    <jats:p>Shock recovery experiments were performed using a two-stage light gas gun to clarify the progressive deformation microstructures of calcite at the submicron scale concerning pressure. Decaying compression pulses were produced using a projectile that was smaller than the natural marble target. In two experiments, natural marble samples were shocked to 13 and 18 GPa at the epicenters of the targets. Calcite grains shocked in the pressure range of 1.1–18 GPa were examined using polarized light microscopy and (scanning) transmission electron microscopy. The density of free dislocations in the grains shocked at 1.1–2.2 GPa [108–9 (cm-2)] is comparable to that of unshocked Carrara calcite grains. Subparallel bands of entangled dislocations less than 1 µm are formed at 4.2 GPa, and strongly entangled dislocations spread throughout the focused ion beam (FIB) sections at 7.3–18 GPa pressures. Dislocations selectively nucleate and entangle near the slip planes at pressures above ~3 GPa, corresponding to the transition from sharp extinction to undulatory extinction, according to the microstructural evolution with shock pressure. Above approximately 6 GPa, the dislocations nucleated homogeneously throughout the calcite crystals. The dislocation microstructure in a calcite grain collected from the asteroid Ryugu particle is similar to that of the experimentally shocked calcite at 4.2 GPa. The estimated pressure of 2–3 GPa, determined through fault mechanics analyses and the presence of dense sulfide minerals in the Ryugu particles, is in line with this pressure.</jats:p>

    DOI

  • Evidence for suboceanic small-scale convection from a “garnet”-bearing lherzolite xenolith from Aitutaki Island, Cook Islands

    Norikatsu Akizawa, Kazuhito Ozawa, Tetsu Kogiso, Akira Ishikawa, Akira Miyake, Yohei Igami, Simon R. Wallis, Takayoshi Nagaya, Chihiro Ohshima, Ryo Fujita, Tatsuhiko Kawamoto, Akihiro Tamura, Tomoaki Morishita, Shoji Arai and Atsushi Yasumoto

    Progress in Earth and Planetary Science (PEPS)   11:38   1 - 28  2024.07  [Refereed]

    　View Summary

    <jats:title>Abstract</jats:title><jats:p>Garnet peridotite xenoliths have been rarely reported from suboceanic mantle. Petrographic and geochemical characteristics of garnet-bearing oceanic peridotite xenoliths provide precious information on dynamics of the suboceanic lithosphere and asthenosphere interaction. We examined a lherzolite xenolith included in olivine nephelinite lava from Aitutaki Island, a member of the Cook-Austral volcanic chain. The lherzolite xenolith contains reddish fine-grained (&lt; 5 µm in size) mineral aggregates (FMAs) with size range of 0.5–6 mm, consisting of olivine, calcic and sodic plagioclases, aluminous spinel, native iron, and nepheline. Microstructural observations and chemical data corroborate that the FMA is a decomposed pyrope-rich garnet including chromian spinel grains with an irregular highly indented morphology in the center. The FMA is surrounded by pyroxene-poor and olivine-rich aureole. The spatial and morphological relationships of FMA and chromian spinel with pyroxene-depleted margin suggest a reaction of aluminous spinel + pyroxenes → pyrope-rich garnet + olivine, which requires a compression before decomposition of the garnet to FMA. An orthopyroxene grain shows slight but clear chemical zoning characterized by increase in Al, Ca, and Cr from the grain center to the rim. The zoning patterns of Al and Ca in the orthopyroxene grain can be modeled by diffusion-controlled solid-state reactions induced by pressure and temperature changes, keeping surface concentrations in equilibrium with the other coexisting mineral phases. The results indicate that the mantle, from which the lherzolite xenolith was derived, underwent isothermal decompression followed by a weak heating on a time scale of a few tenths of million years before the xenolith extraction. From the deduced compression and decompression histories, we hypothesize that the mantle beneath Aitutaki Island was once dragged down to a garnet-stable deep mantle region and brought up later by small-scale sublithospheric convection.</jats:p>

    DOI

  • Deformation mechanisms and fluid conditions of mélange shear zones associated with seamount subduction

    Madison Frank, Kohtaro Ujiie, Ginta Motohashi and Takayoshi Nagaya

    Progress in Earth and Planetary Science (PEPS)   11:34   1 - 17  2024.06  [Refereed]

    Authorship：Last author

    　View Summary

    <jats:title>Abstract</jats:title><jats:p>Lithologic heterogeneity and the presence of fluids have been linked to seamount subduction and collocated with slow earthquakes. However, the deformation mechanisms and fluid conditions associated with seamount subduction remain poorly understood. The exhumed Chichibu accretionary complex on Amami-Oshima Island preserves mélange shear zones composed of mudstone-dominated mélange and basalt–limestone mélange deformed under sub-greenschist facies metamorphism. The mudstone-dominated mélange contains sandstone, siliceous mudstone, and basalt lenses in an illitic matrix. The basalt–limestone mélange contains micritic limestone and basalt lenses in a chloritic matrix derived from the mixing of limestone and basalt at the foot of a seamount. The basalt–limestone mélange overlies the mudstone-dominated mélange, possibly representing a submarine landslide from the seamount onto trench-fill terrigenous sediments. The asymmetric <jats:italic>S</jats:italic>–<jats:italic>C</jats:italic> fabrics in both mélanges show top-to-SE shear consistent with megathrust-related shear. Quartz-filled shear and extension veins in the mudstone-dominated mélange indicate brittle failure at near-lithostatic fluid pressure and low differential stress. Microstructural observations show that deformation in the mudstone-dominated mélange was accommodated by dislocation creep of quartz and combined quartz pressure solution with frictional sliding of illite, whereas the basalt-limestone mélange was accommodated by frictional sliding of chlorite and dislocation creep of coarse-grained calcite, with possible pressure solution creep and diffusion creep of fine-grained calcite. The mélange shear zones formed in association with seamount subduction record temporal changes in deformation mechanisms, fluid pressure, and stress state during megathrust shear with brittle failure under elevated fluid pressure, potentially linking tremor generation near subducting seamounts.</jats:p>

    DOI

  • Deformation-induced, retrograde transformation of kyanite to andalusite: An example of felsic granulite in the southern Bohemian Massif

    Takuro Yoshioka, Kyuichi Kanagawa, Yoshikuni Hiroi, Takao Hirajima, Martin Svojtka, Tomokazu Hokada, Simon R. Wallis, Takayoshi Nagaya, Akira Miyake

    Tectonophysics   ( 877:230293 )  2024.04  [Refereed]

    DOI

  • Ultramafic Rocks from the Sanbagawa Belt: Records of Mantle Wedge Processes

    Atsushi Okamoto, Takayoshi Nagaya, Shunsuke Endo, and Tomoyuki Mizukami

    Elements   ( 20 ) 83 - 88  2024.04  [Refereed]

    　View Summary

    <jats:p>Mantle wedge domains beneath the forearc Moho are unique regions of Earth’s interior where mantle encounters subducting oceanic plates. Crystal-plastic deformation and fluid-induced reactions in the supra-subduction mantle control global material circulation, arc volcanism, and seismicity within subduction zones. The Sanbagawa metamorphic belt contains numerous ultramafic blocks in its higher-grade zones, some of which likely originated as lower crustal arc cumulates that were subsequently incorporated into the mantle wedge and transported to the slab–mantle interface by mantle flow. Properties of these ultramafic rocks provide a valuable opportunity to understand the dynamic processes of the mantle wedge up to 80 km depth, including mantle flow, hydration/dehydration, and fluid–rock interactions near the slab–mantle interface of a warm subduction zone.</jats:p>

    DOI

  • Mineralogical aspects of asteriscus of goldfish (Carassius auratus) consisting of vaterite

    Gen TAKAHASHI , Taiga OKUMURA, Takayoshi NAGAYA, Michio SUZUKI, Toshihiro KOGURE

    Journal of Mineralogical and Petrological Sciences (JMPS)   ( 119:231206 )  2024.03  [Refereed]

    DOI

  • Duplex Underplating, Sediment Dehydration and Quartz Vein Mineralization in the Deep Tremor Source Region

    Kohtaro Ujiie, Naoki Nishiyama, Hisaki Yamamoto, Minoru Yamashita, Takayoshi Nagaya, Takashi Sano, Yui Kouketsu

    Journal of Geophysical Research (JGR): Solid Earth   ( 129:e2023JB027901 )  2024.02  [Refereed]

    DOI

  • Subduction plate interface shear stress associated with rapid subduction at deep slow earthquake depths: example from the Sanbagawa belt, southwestern Japan

    Koyama, Y., Wallis, S. R., & Nagaya T

    Solid Earth   ( 15 ) 143 - 166  2024.02  [Refereed]

    Authorship：Last author

    　View Summary

    <jats:p>Abstract. Maximum shear stress along an active deformation zone marking the subduction plate interface is important for understanding earthquake phenomena and is an important input parameter in subduction zone thermomechanical modeling. However, such maximum shear stress is difficult to measure directly at depths more than a few kilometers and is generally estimated by simulation using a range of input parameters with large associated uncertainties. In addition, estimated values generally represent maximum shear stress conditions over short observation timescales, which may not be directly applicable to long-timescale subduction zone modeling. Rocks originally located deep in subduction zones can record information about deformation processes, including maximum shear stress conditions, occurring in regions that cannot be directly accessed. The estimated maximum shear stress is likely to be representative of maximum shear stress experienced over geological timescales and be suitable to use in subduction zone modeling over timescales of millions to tens of millions of years. In this study, we estimated maximum shear stress along a subduction plate interface by using samples from the Sanbagawa metamorphic belt of southwestern (SW) Japan, in which slivers of mantle-wedge-derived serpentinite are widely distributed and in direct contact with metasedimentary rocks derived from the subducted oceanic plate. These areas can be related to the zone of active deformation along the subduction plate interface. To obtain estimates of maximum shear stress at the subduction interface, we focused on the microstructure of quartz-rich metamorphic rocks – quartz is the main component of the rocks we collected and its deformation stress is assumed to be roughly representative of the stress experienced by the surrounding rock and plate interface deformation zone. Maximum shear stress was calculated by applying deformation temperatures estimated by the crystallographic orientation of quartz (the quartz c-axis fabric opening-angle thermometer) and the apparent grain size of dynamically recrystallized quartz in a thin section to an appropriate piezometer. Combined with information on sample deformation depth, estimated from the P–T (pressure–temperature) path and deformation temperatures, it is suggested that there was nearly constant maximum shear stress of 15–41 MPa in the depth range of about 15–30 km, assuming plane stress conditions even when uncertainties related to the measurement direction of thin section and piezometer differences are included. The Sanbagawa belt formed in a warm subduction zone. Deep slow earthquakes are commonly observed in modern-day warm subduction zones such as SW Japan, which has a similar thermal structure to the Sanbagawa belt. In addition, deep slow earthquakes are commonly observed to be concentrated in a domain under the shallow part of the mantle wedge. Samples showed the depth conditions near the mantle wedge, suggesting that these samples were formed in a region with features similar to the deep slow earthquake domain. Estimated maximum shear stress may not only be useful for long-timescale subduction zone modeling but also represent the initial conditions from which slow earthquakes in the same domain nucleated.
    </jats:p>

    DOI

  • Dehydration of brucite + antigorite under mantle wedge conditions: insights from the direct comparison of microstructures before and after experiments

    Nagaya,T., Okamoto, A., Kido, M., Muto, J., & Wallis, S. R.

    Contributions to Mineralogy and Petrology (CMP)   177:87  2022.09  [Refereed]  [International journal]

    Authorship：Lead author, Corresponding author

    DOI

  • Thermal structure in subducted units from continental Moho depths in a palaeo subduction zone, the Asemigawa region of the Sanbagawa metamorphic belt, SW Japan

    Yui Kouketsu, Kazushi Sadamoto, Hayato Umeda, Hirokazu Kawahara, Takayoshi Nagaya, Tomoki Taguchi, Hiroshi Mori, Simon Wallis, Masaki ENAMI

    Journal of Metamorphic Geology    2021.08  [Refereed]

    　View Summary

    <jats:title>Abstract</jats:title><jats:p>Raman CM geothermometry applied to 126 samples of pelitic schists collected over an area of 11 km × 7 km reveals the thermal structure of the Asemigawa region of the Sanbagawa metamorphic belt, southwest Japan in unprecedented detail. In general, the estimated temperatures gradually increase from south to north in the range of 288–553°C. However, a temperature gap from ~380 to ~440°C is identified near the boundary between the chlorite and garnet zones. This temperature region matches the depth of the continental Moho of the Sanbagawa subduction zone. The temperature gradient in the higher‐temperature domain is higher than that in the lower‐temperature domain, and large‐scale tight folds that affect the thermal structure are developed in the high‐grade units and in the vicinity of the temperature discontinuity. These geological structures probably reflect that the exhumed slab units was dammed at the Moho depth due to the upward movement being impeded by increase in the coupling strength of the overlying rocks associated with exhumation from beneath serpentinite rocks to a shallower domain overlain by crustal rocks. Changes in the coupling strength along the subduction boundary led the strong folding at the higher‐temperature domain and the pre‐formed foliation developed at the Moho depth may have acted as the tectonic boundary, resulting in a temperature discontinuity. These results will contribute to elucidating various geological phenomena occurring in the forearc regions of modern subduction zones.</jats:p>

    DOI

  • Multi-stage infiltration of Na- and K-rich fluids from pegmatites at mid-crustal depths as revealed by feldspar replacement textures

    Astin Nurdiana, Atsushi Okamoto, Kenta Yoshida, Masaoki Uno, Takayoshi Nagaya, Noriyoshi Tsuchiya

    Lithos   ( 388-389:106096 )  2021.05  [Refereed]  [International journal]

    DOI

  • Rapid fluid infiltration and permeability enhancement during middle-lower crustal fracturing: Evidence from amphibolite-granulite- facies fluid-rock reaction zones, Sør Rondane Mountains, East Antarctica

    Diana Mindaleva, Masaoki Uno, Fumiko Higashino, Takayoshi Nagaya, Atsushi Okamoto, Noriyoshi Tsuchiya

    Lithos   372-373:105521  2020.11  [Refereed]  [International journal]

    DOI

  • Crystallographic preferred orientation of talc determined by an improved EBSD procedure for sheet silicates: Implications for anisotropy at the slab–mantle interface due to Si-metasomatism

    Takayoshi Nagaya, Atsushi Okamoto, Ryosuke Oyanagi, Yusuke Seto, Akira Miyake, Masaoki Uno, Jun Muto, Simon R. Wallis

    American Mineralogist    2020.06  [Refereed]

    Authorship：Lead author, Corresponding author

    　View Summary

    <jats:title>Abstract</jats:title><jats:p>Talc is widely distributed over the Earth's surface and is predicted to be formed in various tectonic settings. Talc is a very soft and anisotropic sheet silicate showing very low friction behavior. Therefore, the formation of talc is expected to weaken the strength of talc-bearing rocks and may be associated with the initiation of subduction, and with a decrease in the coupling coefficient resulting in aseismic movements along faults and shear zones within subduction zones. For these reasons, understanding the crystallographic preferred orientation (CPO) of talc is important to quantify the anisotropy and physical properties of the host rock. However, it is difficult to measure a significant number of talc crystal orientations and to evaluate the accuracy of the measurements using electron-backscattered diffraction (EBSD). Therefore, talc CPO has not been reported, and there is uncertainty regarding the estimation of the strength of deformed talc-bearing rocks. Using methods developed for antigorite, we report the first successful EBSD measurements of talc CPO from a talc schist formed due to Simetasomatism of ultramafic rocks by subduction zone fluids. We used a combination of W-SEM and FE-SEM measurements to examine domains of various grain sizes of talc. In addition, we used TEM measurements to evaluate the accuracy of the EBSD measurements and discuss the results of talc CPO analysis. Talc CPO in the present study shows a strong concentration of the pole to the (001) plane normal to the foliation. The strongest concentration of the [100] direction is parallel to the lineation. The talc schist produces similar S-wave splitting and P- and S-wave anisotropy as antigorite schist in deeper domains, thus identifying talc-rich layers in subduction zones may require a combination of geophysical surveys, seismic observations, and anisotropy modeling. The presence of strong talc CPO in rocks comprising the slab–mantle interface boundary may promote spatial expansion of the slip area during earthquakes along the base of the mantle wedge.</jats:p>

    DOI

  • Formation of secondary olivine after orthopyroxene during hydration of mantle wedge: evidence from the Khantaishir Ophiolite, western Mongolia

    Otgonbayar Dandar, Atsushi Okamoto, Masaoki Uno, Ryosuke Oyanagi, Takayoshi Nagaya, Ulziiburen Burenjargal, Tsuyoshi Miyamoto, Noriyoshi Tsuchiya

    Contributions to Mineralogy and Petrology (CMP)   174:86  2019.10  [Refereed]  [International journal]

    DOI

  • Coexisting different types of zoned garnet in kyanite-quartz eclogites from the Sanbagawa metamorphic belt: Evidence of deformation-induced lithological mixing during prograde metamorphism

    Masaki Enami, Jun-Ichi Kimura, Motohiro Tsuboi, Yui Kouketsu, Takayoshi Nagaya, Shuaimin Huang

    Island Arc   28:e12274  2018.10  [Refereed]  [International journal]

    　View Summary

    <jats:title>Abstract</jats:title><jats:p>Garnet grains in Sanbagawa quartz eclogites from the Besshi region, central Shikoku commonly show a zoning pattern consisting of core and mantle/rim that formed during two prograde stages of eclogite and subsequent epidote–amphibolite facies metamorphism, respectively. Garnet grains in the quartz eclogites are grouped into four types (I, II, III, and IV) according to the compositional trends of their cores. Type I garnet is most common and sometimes coexists with other types of garnet in a thin section. Type I core formed with epidote and kyanite during the prograde eclogite facies stage. The inner cores of types II and III crystallized within different whole‐rock compositions of epidote‐free and kyanite‐bearing eclogite and epidote‐ and kyanite‐free eclogite at the earlier prograde stage, respectively. The inner core of type IV probably formed during the pre‐eclogite facies stage. The inner cores of types II, III, and IV, which formed under different P–T conditions of prograde metamorphism and/or whole‐rock compositions, were juxtaposed with the core of type I, probably due to tectonic mixing of rocks at various points during the prograde eclogite facies stage. After these processes, they have shared the following same growth history: (i) successive crystal growth during the later stage of prograde eclogite facies metamorphism that formed the margin of the type I core and the outer cores of types II, III, and IV; (ii) partial resorption of the core during exhumation and hydration stage; and (iii) subsequent formation of mantle zones during prograde metamorphism of the epidote–amphibolite facies. The prograde metamorphic reactions may not have progressed under an isochemical condition in some Sanbagawa metamorphic rocks, at least at the hand specimen scale. This interpretation suggests that, in some cases, material interaction promoted by mechanical mixing and fluid‐assisted diffusive mass transfer probably influences mineral reactions and paragenesis of high‐pressure metamorphic rocks.</jats:p>

    DOI

  • Minimizing and quantifying mis-indexing in electron backscatter diffraction (EBSD) determinations of antigorite crystal directions

    Takayoshi Nagaya, Simon R. Wallis, Yusuke Seto, Akira Miyake, Yusuke Soda, Seiichiro Uehara, Megumi Matsumoto

    Journal of Structural Geology    2017.02  [Refereed]

    Authorship：Lead author, Corresponding author

    DOI

  • An integrated EPMA-EBSD study of metamorphic histories recorded in garnet

    Masaki Enami, Takayoshi Nagaya, Maw Maw Win

    American Mineralogist    2017.01  [Refereed]

    DOI

  • Seismic evidence for flow in the hydrated mantle wedge of the Ryukyu subduction zone

    Takayoshi Nagaya, Andrew M. Walker, James Wookey, Simon R. Wallis, Kazuhiko Ishii, J. -Michael Kendall

    Scientific Reports    2016.07  [Refereed]

    Authorship：Lead author, Corresponding author

    　View Summary

    <jats:title>Abstract</jats:title><jats:p>It is widely accepted that water-rich serpentinite domains are commonly present in the mantle above shallow subducting slabs and play key roles in controlling the geochemical cycling and physical properties of subduction zones. Thermal and petrological models show the dominant serpentine mineral is antigorite. However, there is no good consensus on the amount, distribution and alignment of this mineral. Seismic velocities are commonly used to identify antigorite-rich domains, but antigorite is highly-anisotropic and depending on the seismic ray path, its properties can be very difficult to distinguish from non-hydrated olivine-rich mantle. Here, we utilize this anisotropy and show how an analysis of seismic anisotropy that incorporates measured ray path geometries in the Ryukyu arc can constrain the distribution, orientation and amount of antigorite. We find more than 54% of the wedge must consist of antigorite and the alignment must change from vertically aligned to parallel to the slab. This orientation change suggests convective flow in the hydrated forearc mantle. Shear wave splitting analysis in other subduction zones indicates large-scale serpentinization and forearc mantle convection are likely to be more widespread than generally recognized. The view that the forearc mantle of cold subduction zones is dry needs to be reassessed.</jats:p>

    DOI

  • Brucite as an important phase of the shallow mantle wedge: Evidence from the Shiraga unit of the Sanbagawa subduction zone, SW Japan

    Hirokazu Kawahara, Shunsuke Endo, Simon R. Wallis, Takayoshi Nagaya, Hiroshi Mori, Yoshihiro Asahara

    Lithos    2016.06  [Refereed]

    DOI

  • Phase equilibria modelling of blueschist and eclogite from the Sanbagawa metamorphic belt of southwest Japan reveals along‐strike consistency in tectonothermal architecture

    O. M. Weller, S. R. Wallis, M. Aoya, T. Nagaya

    Journal of Metamorphic Geology    2015.08  [Refereed]

    Authorship：Last author

    　View Summary

    <jats:title>Abstract</jats:title><jats:p>The Sanbagawa metamorphic belt of southwest Japan is one of the type localities of subduction‐related high‐<jats:italic>P</jats:italic> metamorphism. However, variable pressure–temperature (<jats:italic>P</jats:italic>–<jats:italic>T</jats:italic>) paths and metabasic assemblages have been reported for eclogite units in the region, leading to uncertainty about the subduction zone paleo‐thermal structure and associated tectonometamorphic conditions. To analyse this variation, phase equilibria modelling was applied to the three main high‐<jats:italic>P</jats:italic> metabasic rock types documented in the region – glaucophane eclogite, barroisite eclogite and garnet blueschist – with modelling performed over a range of <jats:italic>P</jats:italic>,<jats:italic> T</jats:italic>, bulk rock H<jats:sub>2</jats:sub>O and bulk rock ferric iron conditions using <jats:sc>thermocalc</jats:sc>. All samples are calculated to share a common steep prograde <jats:italic>P</jats:italic>–<jats:italic>T</jats:italic> path to similar peak conditions of ∼16–20 kbar and 560–610 °C. The results establish that regional assemblage variation is systematic, with the alternation in peak amphibole phase due to peak conditions overlapping the glaucophane–barroisite solvus, and bulk composition effects stabilizing blueschist <jats:italic>v</jats:italic>. eclogite facies assemblages at similar <jats:italic>P</jats:italic>–<jats:italic>T</jats:italic> conditions. Furthermore, the results reveal that a steep prograde <jats:italic>P</jats:italic>–<jats:italic>T</jats:italic> path is common to all eclogite units in the Sanbagawa belt, indicating that metamorphic conditions were consistent along strike. All localities are compatible with predictions made by a ridge approach model, which attributes eclogite facies metamorphism and exhumation of the Sanbagawa belt to the approach of a spreading ridge.</jats:p>

    DOI

  • Reply to comment by Nozaka (2014) on "Dehydration breakdown of antigorite and the formation of B-type olivine CPO"

    Takayoshi Nagaya, Simon R. Wallis, Hiroaki Kobayashi, Katsuyoshi Michibayashi, Tomoyuki Mizukami, Yusuke Seto, Akira Miyake, Megumi Matsumoto

    Earth and Planetary Science Letters (EPSL)   408   406 - 407  2014.12  [Refereed]  [International journal]

    Authorship：Lead author, Corresponding author

    DOI

  • Two types of antigorite serpentinite controlling heterogeneous slow-slip behaviours of slab–mantle interface

    Tomoyuki Mizukami, Hironori Yokoyama, Yoshihiro Hiramatsu, Shoji Arai, Hirokazu Kawahara, Takayoshi Nagaya, Simon R. Wallis

    Earth and Planetary Science Letters    2014.09  [Refereed]

    DOI

  • Dehydration breakdown of antigorite and the formation of B-type olivine CPO

    Takayoshi Nagaya, Simon R. Wallis, Hiroaki Kobayashi, Katsuyoshi Michibayashi, Tomoyuki Mizukami, Yusuke Seto, Akira Miyake, Megumi Matsumoto

    Earth and Planetary Science Letters    2014.02  [Refereed]

    Authorship：Lead author, Corresponding author

    DOI

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Presentations

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Research Projects

  • Investigation of deformation microstructure of shallow wedge mantle based on dehydration and deformation experiments of serpentinite

    Japan Society for the Promotion of Science (JSPS)  Multi-year Fund

    Project Year :

    2024.04
    -
    2028.03
     

    Takayoshi NAGAYA

  • Development of a program for acquiring techniques and skills for exhibiting and digitally archiving geological specimens

    Research Project on Improvement of Graduate School Education

    Project Year :

    2025.04
    -
    2026.03
     

    Osamu Takahashi, Naohisa NISHIDA, Takayoshi NAGAYA

  • Development of practical programs by creating a database and building a set of teaching materials of rock and mineral specimens and rock gardens of Tokyo Gakugei University and its affiliated schools

    Special Development Research Projects

    Project Year :

    2025.04
    -
    2026.03
     

    Naohisa NISHIDA, Yusaku GAMOU, Makiko MIYAGUCHI, Yoshihiro SEKITA, Takayoshi NAGAYA

  • Development of practical programs by creating a database and building a set of teaching materials of rock and mineral specimens and rock gardens of Tokyo Gakugei University and its affiliated schools

    Special Development Research Projects

    Project Year :

    2024.04
    -
    2025.03
     

    Takayoshi NAGAYA, Toshiya MITSUI, Makiko MIYAGUCHI, Naohisa NISHIDA, Yoshihiro SEKITA

  • Development of a program for acquiring techniques and skills for exhibiting and digitally archiving geological specimens

    Research Project on Improvement of Graduate School Education

    Project Year :

    2024.04
    -
    2025.03
     

    Takayoshi NAGAYA, Naohisa NISHIDA, Osamu TAKAHASHI

  • New developments in EBSD analysis applied to characterization of fault rock microstructure

    Japan Society for the Promotion of Science (JSPS)  Multi-year Fund

    Project Year :

    2020.10
    -
    2024.03
     

  • Estimation of Antigorite Serpentinite Structure of Wedge Mantle in Subduction Zones

    Japan Society for the Promotion of Science (JSPS)  Multi-year Fund

    Project Year :

    2020.04
    -
    2024.03
     

    Takayoshi NAGAYA

  • Strength mapping of continental crust in metamorphic core complexes of the western United States

    Japan Society for the Promotion of Science (JSPS)  Multi-year Fund

    Project Year :

    2017.04
    -
    2021.03
     

    Nagaya Takayoshi

    　View Summary

    Natural deformed rocks derived from the continental crust and exposed in the Ruby Mountains-East Humboldt Range of the western US were investigated. Obtained rock samples show the different deformation textures in rocks predicted to have been deformed under different deformation conditions in the continental crust. A set of these rock samples can provide us information of the rheological properties of under various deformation conditions in the crust. In laboratory experiments it was successful to obtain crystallographic orientation information of minerals and the Ti contents of quartz grains in samples. This achievement enables us to constrain the quantitative deformation conditions and is expected to contribute to construct a detailed strength profile through the crust.

  • Microstructural analysis of the Median Tectonic Line to elucidate the strength ofthe continental crusts

    Japan Society for the Promotion of Science (JSPS)  Single-year Grants

    Project Year :

    2016.04
    -
    2019.03
     

    Takayoshi NAGAYA

  • Elucidation of the ssubduction mechanism of antigorite

    Japan Society for the Promotion of Science (JSPS)  Single-year Grants

    Project Year :

    2013.04
    -
    2016.03
     

    Takayoshi NAGAYA

  • Graduate Student Exchange Program for Advanced Collaborative Research of Nagoya University

    Japan Student Services Organization (JASSO)  International Student Exchange Support Program

    Project Year :

    2014.03
    -
    2014.06
     

    Takayoshi NAGAYA

  • Earth Science Research Exchange between Nagoya University and the University of Bristol

    Japan Student Services Organization (JASSO)  International Student Exchange Support Program

    Project Year :

    2012.10
    -
    2013.01
     

    Takayoshi NAGAYA

  • Program for fostering young human resources for basic environmental studies (Short-term dispatch)

    Japan Society for the Promotion of Science (JSPS)  Institutional Program for Young Researcher Overseas Visit

    Project Year :

    2012.12
    -
    　
     

    Takayoshi NAGAYA

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Syllabus

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Academic Activities

  • JpGU Meeting 2025 (Session [S-MP28])

    Academic society, research group, etc.

    Japan Geoscience Union (JpGU)  

    2025.05
    -
    　

  • JpGU Meeting 2024 (Field Trip)

    Academic society, research group, etc.

    Japan Geoscience Union (JpGU)  

    2024.06
    -
    　

    　View Summary

    In charge ofthe course of [FT-06] The Geology of Nagatoro, Chichibu: the birthplace of Geology in Japan (Simon Wallis, Takayoshi Nagaya)

  • JpGU Meeting 2024 (Session [S-MP24])

    Academic society, research group, etc.

    Japan Geoscience Union (JpGU)   Makuhari Messe

    2024.05
    -
    　

    　View Summary

    Session Convener and Chairperson at Session [S-MP24] Deformed rocks, Metamorphic rocks and Tectonics https://www.jpgu.org/meeting_e2024/sessionlist_en/detail/S-MP24.html

  • The 2nd International Association of Geo Chemistry (IAGC) International Conference (the 17th International Symposium on Water-Rock Interaction (WRI-17) / the 14th International Symposium Applied Isotope Geochemistry (AIG-14)) : Session [C-7]

    Academic society, research group, etc.

    The 17th International Symposium on Water-Rock Interaction (WRI-17)   Sendai International Center

    2023.08
    -
    　

    　View Summary

    Session Convener and Chairperson at Session [C-7] Mass and Energy Systems in Convergent Margins https://confit.atlas.jp/guide/event/wri17/session/1R207-08/class https://confit.atlas.jp/guide/event/wri17/session/1R209-10/class https://confit.atlas.jp/guide/event/wri17/session/1P70-71/class

  • The 2nd International Association of Geo Chemistry (IAGC) International Conference (the 17th International Symposium on Water-Rock Interaction (WRI-17) / the 14th International Symposium Applied Isotope Geochemistry (AIG-14)) (Field Trip)

    Academic society, research group, etc.

    17th International Symposium on Water-Rock Interaction (WRI-17)  

    2023.08
    -
    　

    　View Summary

    In charge ofthe course of P2 Nagatoro-Nikko in Post-conference tours (Takayoshi Nagaya, Atsushi Okamoto, Ryosuke Oyanagi)

  • JpGU Meeting 2023 (Session [S-MP26])

    Academic society, research group, etc.

    Japan geoscience union(JpGU)   Makuhari Messe

    2023.05
    -
    　

    　View Summary

    Session Convener and Chairperson at Session [S-MP26] Deformed rocks, Metamorphic rocks and Tectonics https://www.jpgu.org/meeting_e2023/sessionlist_en/detail/S-MP26.html

  • JpGU Meeting 2022 (Session [S-CG44])

    Academic society, research group, etc.

    Japan Geoscience Union (JpGU)   Online

    2022.06
    -
    　

    　View Summary

    Online Poster (andFlash Talk) Chairperson at [S-CG44] Science of slow-to-fast earthquakes https://confit.atlas.jp/guide/event/jpgu2022/session/SCG44_3PO1/detail

  • JpGU-AGU Joint Meeting 2020: Virtual (Session [S-MP40])

    Academic society, research group, etc.

    Japan Geoscience Union (JpGU)-American Geophysical Union (AGU)   Online

    2020.07
    -
    　

    　View Summary

    Session Convener, Chairperson and Discussion Forum Session (DFS) Panelist at Session [S-MP40] Thermal structure of subduction zones: modeling and the rock record https://confit.atlas.jp/guide/event/jpgu2020/session/SMP40_27PM1/advanced https://confit.atlas.jp/guide/event/jpgu2020/session/SMP40_27PO1/advanced

  • JpGU-AGU Joint Meeting 2017 (Session [S-GL33])

    Academic society, research group, etc.

    Japan Geoscience Union (JpGU)-American Geophysical Union (AGU)   Makuhari Messe

    2017.05
    -
    　

    　View Summary

    Session Convener and Chairperson at Session [S-GL33] Geodynamics of convergent margins: theoretical, laboratory and natural examples https://confit.atlas.jp/guide/event/jpguagu2017/session/SGL33_23AM1/class https://confit.atlas.jp/guide/event/jpguagu2017/session/SGL33_23PO1/class https://confit.atlas.jp/guide/event/jpguagu2017/session/SGL33_23PM1/class

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Sub-affiliation

  • Faculty of Science and Engineering   Graduate School of Creative Science and Engineering