YOKOYAMA TADASHI 横山正

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YOKOYAMA Tadashi 横山正

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Researcher Number	60403101
Other IDs
Affiliation (Current)	2025: 広島大学, 先進理工系科学研究科(総), 教授
Affiliation (based on the past Project Information) *help	2022 – 2024: 広島大学, 先進理工系科学研究科(総), 准教授 2016 – 2018: 広島大学, 総合科学研究科, 准教授 2012 – 2015: 大阪大学, 理学(系)研究科(研究院), 助教 2012: 大阪大学, 大学院・理学研究科, 助教 2007 – 2011: Osaka University, 理学研究科, 助教 2009: Osaka University, 大学院・理学研究科, 助教 2006: 大阪大学, 理学研究科, 助手
Review Section/Research Field	Principal Investigator Petrology/Mineralogy/Science of ore deposit / Petrology/Mineralogy/Economic geology / Basic Section 17030:Human geosciences-related
Keywords	Principal Investigator 溶解 / 風化 / 砂岩 / 間隙水 / 流紋岩 / 拡散 / 間隙 / 花崗岩 / 岩石・鉱物・鉱床学 / 浸透流 … More / 溶存元素 / 岩石 / 不飽和 / 水飽和率 / 水膜 / 岩石-水相互作用 / 化学風化 / 物理風化 / 溶存シリカ / 電気二重層 / 流紋碧 / 遠心分離 / 岩石・水反応 Less

Research Projects
(6 results)
Research Products
(25 results)

花崗岩の風化：粒界の分離と反応-輸送特性の変化Principal Investigator
- Principal Investigator
  
  横山正
- Project Period (FY)
  2022 – 2026
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Review Section
  
  Basic Section 17030:Human geosciences-related
- Research Institution
  Hiroshima University
Evaluation of reactive-transport process in rock pores by water expulsion methodPrincipal Investigator
- Principal Investigator
  
  Yokoyama Tadashi
- Project Period (FY)
  2016 – 2018
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Petrology/Mineralogy/Economic geology
- Research Institution
  Hiroshima University
Role of water film in water-rock reaction under unsaturated conditionPrincipal Investigator
- Principal Investigator
  
  Yokoyama Tadashi
- Project Period (FY)
  2013 – 2015
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Petrology/Mineralogy/Economic geology
- Research Institution
  Osaka University
Interaction between chemical and physical processes in rock weatheringPrincipal Investigator
- Principal Investigator
  
  YOKOYAMA Tadashi
- Project Period (FY)
  2010 – 2012
- Research Category
  
  Grant-in-Aid for Young Scientists (B)
- Research Field
  
  Petrology/Mineralogy/Science of ore deposit
- Research Institution
  Osaka University
Diffusion property of dissolved silica in rock pore waterPrincipal Investigator
- Principal Investigator
  
  YOKOYAMA Tadashi
- Project Period (FY)
  2008 – 2009
- Research Category
  
  Grant-in-Aid for Young Scientists (B)
- Research Field
  
  Petrology/Mineralogy/Science of ore deposit
- Research Institution
  Osaka University
水・岩石界面近傍の水の特性変化の状態分析Principal Investigator
- Principal Investigator
  
  横山正
- Project Period (FY)
  2006 – 2007
- Research Category
  
  Grant-in-Aid for Young Scientists (B)
- Research Field
  
  Petrology/Mineralogy/Science of ore deposit
- Research Institution
  Osaka University

All 2023 2018 2017 2016 2015 2011 2010 2009 2008 2007 2006 Other

All Journal Article Presentation

[Journal Article] Kinetics of chemical weathering: Field research, laboratory experiment and theoretical analysis of rhyolite weathering2015
- Author(s)
  横山　正
- Journal Title
  
  Japanese Magazine of Mineralogical and Petrological Sciences
  
  Volume: 44 Issue: 1 Pages: 45-51
- DOI
  10.2465/gkk.141214
- NAID
  130004793361
- ISSN
  1345-630X, 1349-7979
- Language
  Japanese
- Data Source
  KAKENHI-PROJECT-25400513
[Journal Article] Solute distribution in porous rhyolite as evaluated by sequential centrifugation2011
- Author(s)
  Tadashi Yokoyama
- Journal Title
  
  Applied Geochemistry
  
  Volume: 26 Issue: 8 Pages: 1524-1534
- DOI
  10.1016/j.apgeochem.2011.06.017
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-10J01812, KAKENHI-PROJECT-18740338, KAKENHI-PROJECT-21340157
[Journal Article] Porosimetry of vesicular volcanic products by a water-expulsion method and the relationship of pore characteristics to permeability.2009
- Author(s)
  T. Yokoyama, S. Takeuchi
- Journal Title
  
  Journal of Geophysical Research 114
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20740308
[Journal Article] Porosimetry of vesicular volcanic products by a water-expulsion method and the relationship of pore characteristics to permeability2009
- Author(s)
  T. Yokoyama and S. Takeuchi
- Journal Title
  
  Journal of Geophysical Research 114
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20740308
[Journal Article] Hydration of rhyolitic glass during weathering as characterized by IR microspectroscopy2008
- Author(s)
  T. Yokoyama, S. Okumura, S. Nakashima
- Journal Title
  
  Geochimica et Cosmochimica Acta 72
  
  Pages: 117-125
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18740338
[Journal Article] Field and laboratory experiments on weathering rates of granodiorite : separation of chemical and physical processes2006
- Author(s)
  T.Yokoyama, Y.Matsukura
- Journal Title
  
  Geology v.34-10
  
  Pages: 809-812
- Data Source
  KAKENHI-PROJECT-18740338
[Presentation] 花崗岩の風化による色変化機構の検討：広島ががら山の例2023
- Author(s)
  横山正，院去由佳，海堀正博
- Organizer
  Japan Geoscience Union Meeting 2023 (JpGU 2023)
- Data Source
  KAKENHI-PROJECT-23K22583
[Presentation] Characterization of brownish area near rock fracture and estimation of iron sources for iron oxide formation: a case study of weathering of granite in Hiroshima2023
- Author(s)
  Tadashi Yokoyama, Yuka Inkyo, Masahiro Kaibori
- Organizer
  The 17th Congress of Water-Rock Interaction (WRI17)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-23K22583
[Presentation] 広島花崗岩のボーリングコア解析：浸透率・間隙率の深さ変化と風化速度への含意2023
- Author(s)
  横山正，吉田淳樹，海堀正博，片山郁夫，谷本和優
- Organizer
  日本鉱物科学会2023年年会
- Data Source
  KAKENHI-PROJECT-23K22583
[Presentation] The rate of capillary rise in sandstone: experiment and modeling2018
- Author(s)
  Masashi Yorimoto, Tadashi Yokoyama, and Naoki Nishiyama
- Organizer
  日本地球惑星科学連合2018年大会
- Data Source
  KAKENHI-PROJECT-16K05608
[Presentation] 段階的間隙水抽出による岩石間隙中の反応-輸送現象の不均質性の評価2017
- Author(s)
  横山　正
- Organizer
  日本地球惑星科学連合2017年大会
- Data Source
  KAKENHI-PROJECT-16K05608
[Presentation] 不飽和状態における岩石の溶解挙動-間隙表面の粗さの影響-2017
- Author(s)
  横山　正，西山直毅
- Organizer
  第15回生命-鉱物-水-大気相互作用研究会
- Place of Presentation
  東京大学
- Data Source
  KAKENHI-PROJECT-16K05608
[Presentation] Pore-scale heterogeneity of solute distribution as evaluated by sequential pore water extraction2016
- Author(s)
  Tadashi Yokoyama
- Organizer
  Goldschmidt 2016
- Place of Presentation
  Yokohama
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-16K05608
[Presentation] 化学的風化と物理的風化の相互作用2011
- Author(s)
  横山正
- Organizer
  2011年微生物-鉱物-水-大気相互作用研究会
- Place of Presentation
  東京大学本郷キャンパス理学部1号館
- Year and Date
  2011-03-10
- Data Source
  KAKENHI-PROJECT-22740345
[Presentation] 砂岩の風化における化学的過程と物理的過程の相互作用2011
- Author(s)
  横山正
- Organizer
  日本鉱物科学会2011年年会
- Place of Presentation
  茨城大学水戸キャンパス
- Year and Date
  2011-09-11
- Data Source
  KAKENHI-PROJECT-22740345
[Presentation] 化学的風化と物理的風化の相互作用2011
- Author(s)
  横山正
- Organizer
  2011 年微生物 - 鉱物 - 水 -大気相互作用研究会
- Place of Presentation
  東京大学
- Year and Date
  2011-03-10
- Data Source
  KAKENHI-PROJECT-22740345
[Presentation] 砂岩の風化における化学的過程と物理的過程の相互作用2011
- Author(s)
  横山正
- Organizer
  日本鉱物科学会 2011 年年会
- Place of Presentation
  茨城大学
- Year and Date
  2011-09-11
- Data Source
  KAKENHI-PROJECT-22740345
[Presentation] 岩石間隙水中の溶存Siの拡散特性2010
- Author(s)
  横山正
- Organizer
  第十回微生物-鉱物-水-大気相互作用研究会
- Place of Presentation
  東京大学本郷キャンパス理学部1号館
- Year and Date
  2010-03-19
- Data Source
  KAKENHI-PROJECT-20740308
[Presentation] 岩石間隙水中の溶存Siの拡散特性2010
- Author(s)
  横山正
- Organizer
  第十回微生物-鉱物-水-大気相互作用研究会
- Place of Presentation
  東京大学
- Year and Date
  2010-03-19
- Data Source
  KAKENHI-PROJECT-20740308
[Presentation] 岩石間隙中の物質輸送と反応～流紋岩の風化の例～2009
- Author(s)
  横山正
- Organizer
  日本鉱物科学会2009年年会
- Place of Presentation
  北海道大学
- Year and Date
  2009-09-08
- Data Source
  KAKENHI-PROJECT-20740308
[Presentation] 岩石間隙中の物質輸送と反応～流紋岩の風化の例～2009
- Author(s)
  横山正
- Organizer
  日本鉱物科学会2009年年会
- Place of Presentation
  北海道大学学術交流会館
- Year and Date
  2009-09-08
- Data Source
  KAKENHI-PROJECT-20740308
[Presentation] 岩石間隙水の遠心分離抽出:電気二重層の影響2007
- Author(s)
  横山正, 中嶋悟, 村上隆
- Organizer
  日本鉱物科学会2007年年会
- Place of Presentation
  東京大学
- Year and Date
  2007-09-24
- Data Source
  KAKENHI-PROJECT-18740338
[Presentation] Characterization of the distributions of water and air in rock pores and its application to the understanding of water-rock interaction in the surface environment
- Author(s)
  T. Yokoyama and N. Nishiyama
- Organizer
  11th International Workshop on Water Dynamics 11
- Place of Presentation
  Tohoku University
- Invited
- Data Source
  KAKENHI-PROJECT-25400513
[Presentation] 岩石－水反応のモデリング～表層環境を中心として～
- Author(s)
  横山　正
- Organizer
  日本地球惑星科学連合2014年大会
- Place of Presentation
  パシフィコ横浜
- Year and Date
  2014-04-28 – 2014-05-02
- Invited
- Data Source
  KAKENHI-PROJECT-25400513
[Presentation] 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
- Author(s)
  横山　正
- Organizer
  日本鉱物科学会2014年年会
- Place of Presentation
  熊本大学
- Year and Date
  2014-09-17 – 2014-09-19
- Invited
- Data Source
  KAKENHI-PROJECT-25400513

YOKOYAMA TADASHI 横山 正

YOKOYAMA Tadashi 横山 正

Research Projects

Research Products

花崗岩の風化：粒界の分離と反応-輸送特性の変化Principal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Evaluation of reactive-transport process in rock pores by water expulsion methodPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Role of water film in water-rock reaction under unsaturated conditionPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Interaction between chemical and physical processes in rock weatheringPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Diffusion property of dissolved silica in rock pore waterPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

水・岩石界面近傍の水の特性変化の状態分析Principal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

[Journal Article] Kinetics of chemical weathering: Field research, laboratory experiment and theoretical analysis of rhyolite weathering2015

Author(s)

Journal Title

DOI

NAID

ISSN

Language

Data Source

[Journal Article] Solute distribution in porous rhyolite as evaluated by sequential centrifugation2011

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Porosimetry of vesicular volcanic products by a water-expulsion method and the relationship of pore characteristics to permeability.2009

Author(s)

Journal Title

Data Source

[Journal Article] Porosimetry of vesicular volcanic products by a water-expulsion method and the relationship of pore characteristics to permeability2009

Author(s)

Journal Title

Data Source

[Journal Article] Hydration of rhyolitic glass during weathering as characterized by IR microspectroscopy2008

Author(s)

Journal Title

Data Source

[Journal Article] Field and laboratory experiments on weathering rates of granodiorite : separation of chemical and physical processes2006

Author(s)

Journal Title

Data Source

[Presentation] 花崗岩の風化による色変化機構の検討： 広島ががら山の例2023

Author(s)

Organizer

Data Source

[Presentation] Characterization of brownish area near rock fracture and estimation of iron sources for iron oxide formation: a case study of weathering of granite in Hiroshima2023

Author(s)

Organizer

Data Source

[Presentation] 広島花崗岩のボーリングコア解析：浸透率・間隙率の深さ変化と風化速度への含意2023

Author(s)

Organizer

YOKOYAMA TADASHI 横山正

YOKOYAMA Tadashi 横山正

[Presentation] 花崗岩の風化による色変化機構の検討：広島ががら山の例2023