横山 正TADASHI YOKOYAMA

Last Updated :2018/10/01

所属・職名
大学院総合科学研究科 環境自然科学講座 准教授
メールアドレス
t-yokoyamahiroshima-u.ac.jp
自己紹介
雨水や河川水が岩石のすきまに浸透すると,岩石を構成する鉱物が水に溶けたり,新しい鉱物が成長したりします。溶出した元素は,移流や拡散によって岩石内部を移動していきます。これらの結果として,岩石風化,土壌発達,地形変化,地下の水質形成など,地球表層環境で生じる諸現象が進行します。このような岩石-水相互作用や物質移動のメカニズムと速度を,様々な手法で研究しています。

基本情報

学歴

  • 東京大学, 地球惑星科学専攻

学位

  • 修士(理学) (東京大学)
  • 博士(理学) (東京大学)

研究キーワード

  • 岩石,鉱物,風化,溶解,拡散,透水,間隙水

教育活動

授業担当

  1. 2018年, 教養教育, 2ターム, 自然科学基礎実験法・同実験II
  2. 2018年, 教養教育, セメスター(後期), 資源と生活
  3. 2018年, 教養教育, 4ターム, 地球科学B
  4. 2018年, 教養教育, 1ターム, 地学実験法・同実験I[1理地]
  5. 2018年, 教養教育, 3ターム, 地学実験法・同実験I[1教自]
  6. 2018年, 教養教育, 1ターム, 地学実験法・同実験I[2理化,2理生]
  7. 2018年, 教養教育, 2ターム, 地学実験法・同実験II[1理地]
  8. 2018年, 教養教育, 4ターム, 地学実験法・同実験II[1教自]
  9. 2018年, 教養教育, 2ターム, 地学実験法・同実験II[2理化,2理生]
  10. 2018年, 学部専門, セメスター(後期), 地学基礎実験
  11. 2018年, 学部専門, セメスター(後期), 地学基礎実験法
  12. 2018年, 学部専門, 3ターム, 自然環境実験A
  13. 2018年, 学部専門, 3ターム, 自然環境実験法A
  14. 2018年, 学部専門, 1ターム, 自然環境実験B
  15. 2018年, 学部専門, セメスター(前期), 自然環境実験法B
  16. 2018年, 学部専門, 2ターム, 自然環境実験C
  17. 2018年, 学部専門, 2ターム, 自然環境実験法C
  18. 2018年, 学部専門, 4ターム, 自然環境演習
  19. 2018年, 学部専門, 4ターム, 環境鉱物学
  20. 2018年, 修士課程・博士課程前期, セメスター(前期), 総合科学演習
  21. 2018年, 修士課程・博士課程前期, セメスター(後期), 総合科学演習
  22. 2018年, 修士課程・博士課程前期, 3ターム, 地球構成物質論

研究活動

学術論文(★は代表的な論文)

  1. 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巻, 147号, pp.1-pp.21, 20180915
  2. 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, 20180315
  3. ★, 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巻, pp.301-pp.312, 20180301
  4. Permeability of porous media: Role of the critical pore size, N. Nishiyama and T. Yokoyama, Journal of Geophysical Research, 122巻, pp.1-pp.17, 2017
  5. 露頭スケールからナノスケールまでの反応-輸送過程, 横山 正・西山直毅, 地学雑誌, 126巻, 3号, pp.297-pp.310, 2017
  6. 岩石内部の水の分布-露頭スケールからナノスケールまで-, 西山直毅・横山 正, 地学雑誌, 126巻, 3号, pp.311-pp.323, 2017
  7. 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巻, 8号, pp.1-pp.10, 2016
  8. 化学風化の速度論:流紋岩風化の野外調査,室内実験および理論解析, 横山 正, 岩石鉱物科学, 44巻, pp.45-pp.51, 2015
  9. Estimation of permeability of sedimentary rocks by applying water-expulsion porosimetry to Katz and Thompson model, N. Nishiyama and T. Yokoyama, Engineering Geology, 177巻, pp.75-pp.82, 2014
  10. 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, pp.2002-pp.2009, 2014
  11. Diffusivity of dissolved silica in rock pore water at 25℃ as characterized by through-diffusion experiments, T. Yokoyama, Water Resources Research, 49巻, pp.8299-pp.8309, 2013
  12. 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巻, pp.153-pp.169, 2013
  13. ★, 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巻, pp.295-pp.311, 2013
  14. Role of water film in weathering of porous rhyolite under water unsaturated condition, T. Yokoyama and N. Nishiyama, Procedia Earth and Planetary Science, 7巻, pp.916-pp.919, 2013
  15. 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巻, pp.620-pp.623, 2013
  16. 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巻, pp.W09556, 2012
  17. Solute distribution in porous rhyolite as evaluated by sequential centrifugation, T. Yokoyama, S. Nakashima, T. Murakami, L. Mercury and Y. Kirino, Applied Geochemistry, 26巻, pp.1524-pp.1534, 2011
  18. 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巻, pp.6285-pp.6299, 2011
  19. 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巻, pp.6841-pp.6851, 2010
  20. 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巻, pp.179-pp.186, 2010
  21. 中国海南島産テクタイトの希ガス組成と含水量について, 下 良拓・西村智佳子・松本拓也・Gyorge Czuppon・方 中・横山 正・中島 悟・松田准一, 地球化学, 44巻, pp.43-pp.50, 2010
  22. 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巻, pp.825-pp.835, 2009
  23. 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巻, pp.395-pp.401, 2009
  24. ★, 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巻, pp.B02201, 2009
  25. 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巻, pp.3767-pp.3781, 2009
  26. 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巻, pp.166-pp.172, 2009
  27. 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巻, pp.31-pp.37, 2009
  28. Hydration of rhyolitic glass during weathering as characterized by IR microspectroscopy. T. Yokoyama, S. Okumura, and S. Nakashima, Geochimica et Cosmochimica Acta, 72巻, pp.117-pp.125, 2008
  29. 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巻, pp.L16303-pp.L16303, 2008
  30. 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巻, pp.81-pp.93, 2008
  31. 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巻, pp.L19308, 2007
  32. Field and laboratory experiments on weathering rates of granodiorite: Separation of chemical and physical processes. T. Yokoyama and Y. Matsukura, Geology, 34巻, pp.809-pp.812, 2006
  33. Diffusivity anisotropy in a rhyolite and its relation to pore structure. T. Yokoyama and S. Nakashima, Engineering Geology, 80巻, pp.328-pp.335, 2005
  34. Color development of iron oxides during rhyolite weathering over 52,000 years. T. Yokoyama and S. Nakashima, Chemical Geology, 219巻, pp.309-pp.320, 2005
  35. Chemical weathering rates of rhyolite -Field and laboratory-. T. Yokoyama, Physicochemistry of Water in Geological and Biological Systems, pp.103-pp.113, 2004
  36. 神津島流紋岩質単成火山群のESR年代, 横山 正・島田愛子・梅村崇志・豊田 新, 火山, 49巻, pp.23-pp.32, 2004
  37. 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巻, pp.377-pp.386, 2003
  38. マイクロフォーカスX線CT装置を用いた堆積物・岩石の内部構造の非破壊観察, 廣野哲朗・横山 正・高橋 学・中嶋 悟・山本由弦・林 為人, 地質学雑誌, 108巻, pp.606-pp.609, 2002
  39. ★, 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巻, pp.2665-pp.2681, 2002
  40. Dissolution rate and weathering of porous rhyolites from Izu-Kozu Island, Japan, T. Yokoyama and J. F. Banfield, of the 5th International Symposium on Geochemistry of the Earth's Surface, pp.407-pp.410, 1999