TADASHI YOKOYAMA

Last Updated :2024/10/01

Affiliations, Positions
Graduate School of Advanced Science and Engineering, Associate Professor
E-mail
t-yokoyamahiroshima-u.ac.jp
Self-introduction
Water permeation in rock pores, dissolution/precipitation of minerals, and transport of dissolved elements by advection and diffusion are major controlling factors of rock weathering, soil development, and geomorphic changes. My interest is to study the mechanism and the rate of such rock-water interactions and material transport in geologic media.

Basic Information

Educational Backgrounds

  • The University of Tokyo, Department of Earth and Planetary Science

Academic Degrees

  • The University of Tokyo
  • The University of Tokyo

Research Fields

  • Mathematical and physical sciences;Earth and planetary science;Petrology / Mineralogy / Economic geology

Research Keywords

  • Rock, Mineral, Weathering, Dissolution, Diffusion, Advection, Pore water

Educational Activity

Course in Charge

  1. 2024, Liberal Arts Education Program1, 4Term, Earth Science B
  2. 2024, Liberal Arts Education Program1, 1Term, Experimental Methods and Laboratory Work in Earth Sciences I
  3. 2024, Liberal Arts Education Program1, 3Term, Experimental Methods and Laboratory Work in Earth Sciences I
  4. 2024, Liberal Arts Education Program1, 1Term, Experimental Methods and Laboratory Work in Earth Sciences I
  5. 2024, Liberal Arts Education Program1, 2Term, Experimental Methods and Laboratory Work in Earth Sciences II
  6. 2024, Liberal Arts Education Program1, 4Term, Experimental Methods and Laboratory Work in Earth Sciences II
  7. 2024, Liberal Arts Education Program1, 2Term, Experimental Methods and Laboratory Work in Earth Sciences II
  8. 2024, Undergraduate Education, Second Semester, Fundamental Laboratory Course in Geology
  9. 2024, Undergraduate Education, Second Semester, Practical Methods in Geology
  10. 2024, Undergraduate Education, 3Term, Laboratory Course in Natural Environmental Sciences A
  11. 2024, Undergraduate Education, 3Term, Practical Methods in Natural Environmental SciencesA
  12. 2024, Undergraduate Education, 1Term, Laboratory Course in Natural Environmental Sciences B
  13. 2024, Undergraduate Education, 1Term, Practical Methods in Natural Environmental SciencesB
  14. 2024, Undergraduate Education, 2Term, Laboratory Course in Natural Environmental Sciences C
  15. 2024, Undergraduate Education, 2Term, Practical Methods in Natural Environmental SciencesC
  16. 2024, Undergraduate Education, 4Term, Environmental Mineralogy
  17. 2024, Undergraduate Education, 3Term, Natural Histories and Sciences
  18. 2024, Graduate Education (Master's Program) , Academic Year, Special Study of Advanced Science and Engineering Transdisciplinary Science and Engineering
  19. 2024, Graduate Education (Master's Program) , First Semester, Special Exercises of Advanced Science and Engineering Transdisciplinary Science and Engineering A
  20. 2024, Graduate Education (Master's Program) , Second Semester, Special Exercises of Advanced Science and Engineering Transdisciplinary Science and Engineering B
  21. 2024, Graduate Education (Master's Program) , 3Term, Transdisciplinary Science and Engineering Program Common Subjects 2 (Green Development)
  22. 2024, Graduate Education (Master's Program) , 2Term, Earth Materials

Research Activities

Academic Papers

  1. Characteristics of brown zone formed by weathering around fracture in the Hiroshima granite and estimation of iron source for iron oxide precipitation. T. Yokoyama, Y. Inkyo, M. Kaibori, Geochemical Journal, 58(5), 202409
  2. Change in size distribution of porewater and entrapped air with progression of water infiltration in sandstone. T. Yokoyama, S. Shintaku, N. Nishiyama, Journal of Mineralogical and Petrological Sciences, 118, 20230422
    Link to Paper Search Results by DOI
  3. Size distributions of water and air in rock pores induced by capillary rise: experiments and modeling. T. Yokoyama, R. Nomura, N. Nishiyama., Transport in Porous Media, 20230329
    Link to Paper Search Results by DOI
  4. Water Film Thickness in Unsaturated Porous Media: Effect of Pore Size, Pore Solution Chemistry, and Mineral Type. N. Nishiyama and T. Yokoyama, Water Resources Research, 57, 20210528
    Link to Paper Search Results by DOI
  5. On porosity determination for hard rock drilling core samples collected by the Oman Drilling Project, J. Geol. Soc. Japan, 126(12), 202012
    Link to Paper Search Results by DOI
  6. Experimental Measurement of the Transport Flow Path Aperture in Thermally Cracked Granite and the Relationship between Pore Structure and Permeability. K. Sueyoshi, T. Yokoyama, I. Katayama, Geofluids, 20201107
    Link to Paper Search Results by DOI
  7. Dissolution of Minerals Driven by the Wetting Film in Rock Pores: Comparison of Silicates and Carbonates. T. Yokoyama and N. Nishiyama, ACS Earth and Space Chemistry, 4, 1920-1930, 20201102
    Link to Paper Search Results by DOI
  8. Flow Path Selection During Capillary Rise in Rock: Effects of Pore Branching and Pore Radius Variation, T.Yokoyama, M. Yorimoto, N Nishiyama, Transport in Porous Media, 135, 79-99, 202009
    Link to Paper Search Results by DOI
  9. Physical characteristics of scoriae and ash from 2014–2015 eruption of Aso Volcano, Japan. A. Namiki, Y. Tanaka and T. Yokoyama, Earth, Planets and Space, 70(147), 1-21, 20180915
    Link to Paper Search Results by DOI
  10. Changes of aliphatic C–H bonds in cyanobacteria during experimental thermal maturation in the presence or absence of silica as evaluated by FTIR microspectroscopy, M. Igisu, T. Yokoyama, Y. Ueno, S. Nakashima, M. Shimojima, H. Ohta, and S. Maruyama, Geobiology, 16(4), 412-428, 20180605
    Link to Paper Search Results by DOI
  11. ★, The effects of charge, polymerization, and cluster size on the diffusivity of dissolved Si species in pore water, T. Yokoyama and H. Sakuma, Geochimica et Cosmochimica Acta, 224, 301-312, 20180301
    Link to Paper Search Results by DOIRepository URL
  12. Permeability of porous media: Role of the critical pore size, N. Nishiyama and T. Yokoyama, Journal of Geophysical Research, 122, 1-17, 20170817
    Link to Paper Search Results by DOI
  13. Distribution of water in rock: from outcrop scale to nanometer scale, N. Nishiyama and T. Yokoyama, Journal of geopraphy, 126(3), 311-323, 20170625
    Link to Paper Search Results by DOI
  14. Reactive Transport Processes from Outcrop Scale to Nano Scale, T. Yokoyama and N. Nishiyama, Journal of Geography, 126(3), 297-310, 20170625
    Link to Paper Search Results by DOI
  15. An experimental study on the rate and mechanism of capillary rise in sandstone, Y. Tsunazawa, T. Yokoyama and N. Nishiyama, Progress in Earth and Planetary Science, 3(8), 1-10, 2016
    Link to Paper Search Results by DOI
  16. Kinetics of chemical weathering: Field research, laboratory experiment and theoretical analysis of rhyolite weathering, T. Yokoyama, Japanese magazine of mineralogical and petrological sciences, 44, 45-51, 2015
  17. Estimation of permeability of sedimentary rocks by applying water-expulsion porosimetry to Katz and Thompson model, N. Nishiyama and T. Yokoyama, Engineering Geology, 177, 75-82, 2014
    Link to Paper Search Results by DOI
  18. Calcium Silicate Hydrate Formation Rates during Alkaline Alteration of Rocks as revealed by Infrared Spectroscopy, S. Nakashima, H. Bessho, R. Tomizawa, Y. Kirino, N. Nishiyama, R. Tonoue, T. Yokoyama and H. Sasamoto, Rock Mechanics for Global Issues - Natural Disasters, Environment and Energy -Proceedings of the 2014 ISRM International Symposium -8th Asian Rock Mechanics Symposium, 2002-2009, 2014
  19. Diffusivity of dissolved silica in rock pore water at 25 C as characterized by through-diffusion experiments, T. Yokoyama, Water Resources Research, 49, 8299-8309, 2013
    Link to Paper Search Results by DOI
  20. Does the reactive surface area of sandstone depend on water saturation?--The role of reactive-transport in water film, N. Nishiyama and T. Yokoyama, Geochimica et Cosmochimica Acta, 122, 153-169, 2013
    Link to Paper Search Results by DOI
  21. ★, Characterization of the reaction and transport properties of porous rhyolite and its application to the quantitative understanding of the chemical weathering rate, T. Yokoyama, Geochimica et Cosmochimica Acta, 118, 295-311, 2013
    Link to Paper Search Results by DOI
  22. Role of water film in weathering of porous rhyolite under water unsaturated condition, T. Yokoyama and N. Nishiyama, Procedia Earth and Planetary Science, 7, 916-919, 2013
    Link to Paper Search Results by DOI
  23. Estimation of water film thickness in geological media associated with the occurrence of gas entrapment, N. Nishiyama and T. Yokoyama, Procedia Earth and Planetary Science, 7, 620-623, 2013
    Link to Paper Search Results by DOI
  24. Size distributions of pore water and entrapped air during drying-infiltration processes of sandstone characterized by water-expulsion porosimetry, N. Nishiyama, T. Yokoyama and S. Takeuchi, Water Resources Research, 48, W09556, 2012
    Link to Paper Search Results by DOI
  25. Solute distribution in porous rhyolite as evaluated by sequential centrifugation, T. Yokoyama, S. Nakashima, T. Murakami, L. Mercury and Y. Kirino, Applied Geochemistry, 26, 1524-1534, 2011
    Link to Paper Search Results by DOI
  26. Hydration-dehydration interactions between glycine and anhydrous salts: Implications for a chemical evolution of life, N. Kitadai, T. Yokoyama and S. Nakashima, Geochimica et Cosmochimica Acta, 75, 6285-6299, 2011
  27. Effects of pH and temperature on dimerization rate of glycine: Evaluation of favorable environmental conditions for chemical evolution of life, K. Sakata, N. Kitadai and T. Yokoyama, Geochimica et Cosmochimica Acta, 74, 6841-6851, 2010
  28. Temperature dependence of molecular structure of dissolved glycine as revealed by ATR-IR spectroscopy, N. Kitadai, T. Yokoyama and S. Nakashima, Journal of Molecular Structure, 981, 179-186, 2010
  29. Noble gas compositions and water contents in tektites from Hainan Island, Chikyukagaku (Geochemistry), 44, 43-50, 2010
  30. Characterization of the states and diffusivity of intergranular water in a chalcedonic quartz by high-temperature in situ infrared spectroscopy, J. Fukuda, T. Yokoyama and Y. Kirino, Mineralogical Magazine, 73, 825-835, 2009
  31. In situ ATR-IR investigation of L-lysine adsorption on montmorillonite, N. Kitadai, T. Yokoyama and S. Nakashima, Journal of Colloid and Interface Science, 338, 395-401, 2009
  32. ★, Porosimetry of vesicular volcanic products by a water-expulsion method and the relationship of pore characteristics to permeability, T. Yokoyama and S. Takeuchi, Journal of Geophysical Research, 114, B02201, 2009
    Link to Paper Search Results by DOI
  33. Kinetics of biotite dissolution and Fe behavior under low O2 conditions and their implications for Precambrian weathering, H. Sugimori, T. Yokoyama and T. Murakami, Geochimica et Cosmochimica Acta, 73, 3767-3781, 2009
  34. Effect of density-driven flow on the through-diffusion experiment. Y. Kirino, T. Yokoyama, T. Hirono, T. Nakajima and S. Nakashima, Journal of Contaminant Hydrology, 106, 166-172, 2009
    Link to Paper Search Results by DOI
  35. ATR-IR spectroscopic study of L-lysine adsorption on amorphous silica. N. Kitadai, T. Yokoyama, and S. Nakashima, Journal of Colloid and Interface Science, 329, 31-37, 2009
  36. Hydration of rhyolitic glass during weathering as characterized by IR microspectroscopy. T. Yokoyama, S. Okumura, and S. Nakashima, Geochimica et Cosmochimica Acta, 72, 117-125, 2008
    Link to Paper Search Results by DOI
  37. Clay mineral reactions caused by frictional heating during an earthquake: An example from the Taiwan Chelungpu fault. T. Hirono, K. Fujimoto, T. Yokoyama, Y. Hamada, W. Tanikawa, O. Tadai, T. Mishima, M. Tanimizu, W. Lin, W. Soh, and S.R. Song, Geophysical Research Letters, 35, L16303-L16303, 2008
  38. Color measurements of volcanic ash deposits from three different styles of summit activity at Sakurajima volcano, Japan: Conduit processes recorded in color of volcanic ash. Y. Yamanoi, S. Takeuchi, S. Okumura, S. Nakashima and T. Yokoyama, Journal of Volcanology and Geothermal Research,, 178, 81-93, 2008
  39. A chemical kinetic approach to estimate dynamic shear stress during the 1999 Taiwan Chi-Chi earthquake. T. Hirono, T. Yokoyama, Y. Hamada, W. Tanikawa, T. Mishima, M. Ikehara, V. Famin, M. Tanimizu, W. Lin, W. Soh, and S.R. Song, Geophysical Research letters, 34, L19308, 2007
  40. Field and laboratory experiments on weathering rates of granodiorite: Separation of chemical and physical processes. T. Yokoyama and Y. Matsukura, Geology, 34, 809-812, 2006
    Link to Paper Search Results by DOI
  41. Diffusivity anisotropy in a rhyolite and its relation to pore structure. T. Yokoyama and S. Nakashima, Engineering Geology, 80, 328-335, 2005
    Link to Paper Search Results by DOI
  42. Color development of iron oxides during rhyolite weathering over 52,000 years. T. Yokoyama and S. Nakashima, Chemical Geology, 219, 309-320, 2005
    Link to Paper Search Results by DOI
  43. Chemical weathering rates of rhyolite -Field and laboratory-. T. Yokoyama, Physicochemistry of Water in Geological and Biological Systems, 103-113, 2004
  44. ESR ages of rhyolitic monogenetic volcanoes in Kozuhima, Japan, Kazan, 49, 23-32, 2004
  45. Biotite dissolution processes and mechanisms in the laboratory and in nature: Early stage weathering environment and vermiculitization. T. Murakami, S. Utsunomiya, T. Yokoyama, and T. Kasama, American Mineralogist,, 88, 377-386, 2003
  46. Nondestructive observation of internal structure in sediments and rocks using microfocus X-ray CT system, The journal of the geological society of Japan, 108, 606-609, 2002
  47. ★, Direct determinations of the rates of rhyolite dissolution and clay formation over 52,000 years and comparison with laboratory measurements, T. Yokoyama and J. F. Banfield, Geochimica et Cosmochimica Acta, 66, 2665-2681, 2002
    Link to Paper Search Results by DOI
  48. Dissolution rate and weathering of porous rhyolites from Izu-Kozu Island, Japan, T. Yokoyama and J. F. Banfield, Proceedings of the 5th International Symposium on Geochemistry of the Earth's Surface, 407-410, 1999