TADASHI YOKOYAMA

Last Updated :2022/07/01

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. 2022, Liberal Arts Education Program1, 2Term, Experimental Methods and Laboratory Work in Science A
  2. 2022, Liberal Arts Education Program1, 2Term, Experimental Methods and Laboratory Work in Earth Sciences II
  3. 2022, Liberal Arts Education Program1, 4Term, Experimental Methods and Laboratory Work in Earth Sciences II
  4. 2022, Liberal Arts Education Program1, 2Term, Experimental Methods and Laboratory Work in Earth Sciences II
  5. 2022, Liberal Arts Education Program1, 4Term, Earth Science B
  6. 2022, Liberal Arts Education Program1, 1Term, Experimental Methods and Laboratory Work in Earth Sciences I
  7. 2022, Liberal Arts Education Program1, 3Term, Experimental Methods and Laboratory Work in Earth Sciences I
  8. 2022, Liberal Arts Education Program1, 1Term, Experimental Methods and Laboratory Work in Earth Sciences I
  9. 2022, Undergraduate Education, Second Semester, Fundamental Laboratory Course in Geology
  10. 2022, Undergraduate Education, Second Semester, Practical Methods in Geology
  11. 2022, Undergraduate Education, 3Term, Laboratory Course in Natural Environmental Sciences A
  12. 2022, Undergraduate Education, 3Term, Practical Methods in Natural Environmental SciencesA
  13. 2022, Undergraduate Education, 1Term, Laboratory Course in Natural Environmental Sciences B
  14. 2022, Undergraduate Education, 1Term, Practical Methods in Natural Environmental SciencesB
  15. 2022, Undergraduate Education, 2Term, Laboratory Course in Natural Environmental Sciences C
  16. 2022, Undergraduate Education, 2Term, Practical Methods in Natural Environmental SciencesC
  17. 2022, Undergraduate Education, 4Term, Environmental Mineralogy
  18. 2022, Undergraduate Education, 3Term, Natural Histories and Sciences
  19. 2022, Graduate Education (Master's Program) , Academic Year, Special Study of Advanced Science and Engineering Transdisciplinary Science and Engineering
  20. 2022, Graduate Education (Master's Program) , First Semester, Special Exercises of Advanced Science and Engineering Transdisciplinary Science and Engineering A
  21. 2022, Graduate Education (Master's Program) , Second Semester, Special Exercises of Advanced Science and Engineering Transdisciplinary Science and Engineering B
  22. 2022, Graduate Education (Master's Program) , 2Term, Earth Materials
  23. 2022, Graduate Education (Master's Program) , 3Term, Risks and Sciences in Natural Environment
  24. 2022, Liberal Arts Education Program1, 2Term, Experimental Methods and Laboratory Work in Science A
  25. 2022, Liberal Arts Education Program1, 4Term, Earth Science B
  26. 2022, Liberal Arts Education Program1, 1Term, Experimental Methods and Laboratory Work in Earth Sciences I
  27. 2022, Liberal Arts Education Program1, 3Term, Experimental Methods and Laboratory Work in Earth Sciences I
  28. 2022, Liberal Arts Education Program1, 1Term, Experimental Methods and Laboratory Work in Earth Sciences I
  29. 2022, Liberal Arts Education Program1, 2Term, Experimental Methods and Laboratory Work in Earth Sciences II
  30. 2022, Liberal Arts Education Program1, 4Term, Experimental Methods and Laboratory Work in Earth Sciences II
  31. 2022, Liberal Arts Education Program1, 2Term, Experimental Methods and Laboratory Work in Earth Sciences II
  32. 2022, Undergraduate Education, Second Semester, Fundamental Laboratory Course in Geology
  33. 2022, Undergraduate Education, Second Semester, Practical Methods in Geology
  34. 2022, Undergraduate Education, 3Term, Laboratory Course in Natural Environmental Sciences A
  35. 2022, Undergraduate Education, 3Term, Practical Methods in Natural Environmental SciencesA
  36. 2022, Undergraduate Education, 1Term, Laboratory Course in Natural Environmental Sciences B
  37. 2022, Undergraduate Education, 1Term, Practical Methods in Natural Environmental SciencesB
  38. 2022, Undergraduate Education, 2Term, Laboratory Course in Natural Environmental Sciences C
  39. 2022, Undergraduate Education, 2Term, Practical Methods in Natural Environmental SciencesC
  40. 2022, Undergraduate Education, 4Term, Environmental Mineralogy
  41. 2022, Undergraduate Education, 3Term, Natural Histories and Sciences
  42. 2022, Graduate Education (Master's Program) , Academic Year, Special Study of Advanced Science and Engineering Transdisciplinary Science and Engineering
  43. 2022, Graduate Education (Master's Program) , First Semester, Special Exercises of Advanced Science and Engineering Transdisciplinary Science and Engineering A
  44. 2022, Graduate Education (Master's Program) , Second Semester, Special Exercises of Advanced Science and Engineering Transdisciplinary Science and Engineering B
  45. 2022, Graduate Education (Master's Program) , 2Term, Earth Materials
  46. 2022, Graduate Education (Master's Program) , 3Term, Risks and Sciences in Natural Environment

Research Activities

Academic Papers

  1. 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
  2. On porosity determination for hard rock drilling core samples collected by the Oman Drilling Project, J. Geol. Soc. Japan, 126(12), 202012
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. ★, 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
  9. Permeability of porous media: Role of the critical pore size, N. Nishiyama and T. Yokoyama, Journal of Geophysical Research, 122, 1-17, 20170817
  10. Distribution of water in rock: from outcrop scale to nanometer scale, N. Nishiyama and T. Yokoyama, Journal of geopraphy, 126(3), 311-323, 20170625
  11. Reactive Transport Processes from Outcrop Scale to Nano Scale, T. Yokoyama and N. Nishiyama, Journal of Geography, 126(3), 297-310, 20170625
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. ★, 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
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. Noble gas compositions and water contents in tektites from Hainan Island, Chikyukagaku (Geochemistry), 44, 43-50, 2010
  27. 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
  28. 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
  29. ★, 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
  30. 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
  31. 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
  32. 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
  33. 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
  34. 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
  35. 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
  36. 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
  37. 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
  38. Diffusivity anisotropy in a rhyolite and its relation to pore structure. T. Yokoyama and S. Nakashima, Engineering Geology, 80, 328-335, 2005
  39. Color development of iron oxides during rhyolite weathering over 52,000 years. T. Yokoyama and S. Nakashima, Chemical Geology, 219, 309-320, 2005
  40. Chemical weathering rates of rhyolite -Field and laboratory-. T. Yokoyama, Physicochemistry of Water in Geological and Biological Systems, 103-113, 2004
  41. ESR ages of rhyolitic monogenetic volcanoes in Kozuhima, Japan, Kazan, 49, 23-32, 2004
  42. 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
  43. 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
  44. ★, 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
  45. 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