Researcher Profile and Settings

Master

Affiliation (Master)

• Faculty of Science　Earth and Planetary Sciences　Earth and Planetary System Science

Affiliation (Master)

• Faculty of Science　Earth and Planetary Sciences　Earth and Planetary System Science

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Profile and Settings

Profile and Settings

• Name (Japanese)

  Yoshimura

• Name (Kana)

  Shumpei

• Name

  201501072437533543

Achievement

Research Interests

• 揮発性成分   マグマ   

Research Areas

• Natural sciences / Solid earth science

Research Experience

• 2015/04 - Today Hokkaido University
• 2013 - 2015 Yamagata University Faculty of Science
• 2011 - 2013 Hokkaido University
• 2010 - 2011 Tohoku University
• 2009 - 2010 Tohoku University

Awards

• 2019/09 日本鉱物科学会 日本鉱物科学会研究奨励賞
   火山噴火現象の実験的・理論的研究 

  受賞者: 吉村俊平
• 2015 日本火山学会 研究奨励賞
   火山噴火現象を支配する素過程についての実験的・理論的研究 

  受賞者: 吉村 俊平

Published Papers

• Controls on the Salinity of Sedimentary Basinal Fluids Under Constant Chemogravitational Potential Conditions

  Shumpei Yoshimura

  GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 24 (3) 2023/03 

  Fluids in sedimentary basins exert a crucial influence on various geological phenomena including natural resource formation. Worldwide drilling projects have revealed that the salinity of sedimentary basinal fluids generally increases with depth, irrespective of lithology, age of sediments, or the presence of a halite bed. However, how these vertical salinity variations are produced and what controls the salinity remain unclear. This work examines a new hypothesis that downward-increasing salinity variations are a natural outcome of the constant chemogravitational potential condition. In a static environment, the salinity is distributed such that the chemogravitational potential of the solute is constant with depth. Once formed, such a distribution would be maintained because no further migration of the solute would occur. To test the hypothesis, a constant chemogravitational potential distribution model was constructed for NaCl-H2O fluids in the sediment column, and NaCl content at each depth was calculated. The results showed that NaCl content monotonically increases with depth, and the variations are similar to the trend of measured data. However, the data were not necessarily completely reproduced by the model, and deviated in some parts from the calculated profile. Such deviation may indicate fluxing of external fluid occurring in these parts, as the constant chemogravitational potential is vulnerable to an advective flow. Therefore, it is proposed that the constant chemogravitational potential condition is a possible endmember theory, influencing natural salinity variations in a static environment.
• 特集「次世代研究者のための火山学講座」

  西村 太志, 石橋 秀巳, 森 俊哉, 地引 泰人, 中道 治久, 齋藤 武士, 嶋野 岳人, 吉村 俊平, 宮縁 育夫

  火山 66 133 - 134 2021/09
• Analysis of H2O and CO2 in volcanic glass through infrared spectroscopy

  Shumpei Yoshimura

  火山2021 年 66 巻 4 号 p. 375-384 66 (4) 375 - 384 2021/09 [Refereed]
  
• Chlorine Heterogeneity in Volcanic Glass as a Faithful Record of Silicic Magma Degassing

  Shumpei Yoshimura, Mitsuhiro Nakagawa

  Journal of Geophysical Research: Solid Earth 126 (5) 2169-9313 2021/05 [Refereed][Not invited]
  
• 石基ガラスの塩素濃度不均質から読み解く珪長質マグマの脱ガス現象

  吉村俊平

  岩石鉱物科学 49 51 - 57 2020 [Not refereed][Not invited]
  
• Buoyant hydrous mantle plume from the mantle transition zone

  Takeshi Kuritani, Qun-Ke Xia, Jun-Ichi Kimura, Jia Liu, Kenji Shimizu, Takayuki Ushikubo, Dapeng Zhao, Mitsuhiro Nakagawa, Shumpei Yoshimura

  Scientific Reports 9 (1) 2019/12 [Refereed]
  
• Fingerprint of silicic magma degassing visualised through chlorine microscopy

  Shumpei Yoshimura, Takeshi Kuritani, Akiko Matsumoto, Mitsuhiro Nakagawa

  Scientific Reports 9 (1) 2045-2322 2019/12
• Chlorine diffusion in rhyolite under low-H2O conditions

  Yoshimura Shumpei

  CHEMICAL GEOLOGY 483 619 - 630 0009-2541 2018/04/20 [Refereed][Not invited]
  
• Magma Vesiculation and Gas Transport as a Controlling Process of Volcanic Eruption

  吉村 俊平

  可視化情報学会誌 = Journal of the Visualization Society of Japan 可視化情報学会 38 (149) 図巻頭1p,60 - 64 0916-4731 2018/04 [Not refereed][Not invited]
  
• Carbonate ions in high-SiO₂ rhyolite observed in fluid-melt equilibrium experiments

  Yoshimura Shumpei, Nakamura Michihiko, Yurimoto Hisayoshi

  GEOCHEMICAL JOURNAL 一般社団法人日本地球化学会 51 (3) 251 - 262 0016-7002 2017 [Refereed][Not invited]
   

  We carried out equilibrium experiments of the CO₂-H₂O-rhyolite system at 0.1–1.5 GPa and 850 and 1200°C to examine the solubility and speciation of CO₂ in high-SiO₂ rhyolite (SiO₂ > 76 wt%). We observed that both CO₂ molecules (CO_2mol) and carbonate anions (CO₃^2–) are dissolved in the quenched rhyolitic glasses based on infrared spectroscopy. This result contrasts with the general understanding that high-SiO₂ rhyolitic melt dissolves CO_2mol only. The concentrations of CO_2mol and CO₃^2– were 199–9200 ppm and 58–2100 ppm, respectively, as quantified based on the Beer-Lambert's law and newly determined extinction coefficients of 1192 ± 130 L·cm^–1·mol^–1 and 91 ± 28 L·cm^–1·mol^–1 for CO_2mol and CO₃^2–, respectively. The water content ranged from 2.6 to 6.1 wt%. Using the thermodynamic analysis, we calculated the partial molar volume of CO_2mol to be = 24.9 ± 2.0 cm³/mol and enthalpy of dissolution to be Δ_slnH = –22.2 ± 6.3 kJ/mol. Changes in volume and enthalpy upon the formation reaction of CO₃^2– were calculated to be Δ_rV = –8.6 ± 0.9 cm³/mol and Δ_rH = +1.1 ± 4.4 kJ/mol, respectively.

• Experimental and Theoretical Studies on Elementary Processes of Volcanic Eruption

  YOSHIMURA Shumpei

  PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 特定非営利活動法人 日本火山学会 61 (4) 605 - 613 0453-4360 2016 [Not refereed][Invited]
  
• Diffusive fractionation of H2O and CO2 during magma degassing

  Yoshimura Shumpei

  CHEMICAL GEOLOGY 411 172 - 181 0009-2541 2015/09/14 [Refereed][Not invited]
  
• Flux of volcanic CO2 emission estimated from melt inclusions and fluid transport modelling

  Yoshimura Shumpei, Nakamura Michihiko

  EARTH AND PLANETARY SCIENCE LETTERS 361 497 - 503 0012-821X 2013/01/01 [Refereed][Not invited]
  
• Carbon dioxide transport in crustal magmatic systems

  Shumpei Yoshimura, Michihiko Nakamura

  EARTH AND PLANETARY SCIENCE LETTERS 307 (3-4) 470 - 478 0012-821X 2011/07 [Refereed][Not invited]
   

  The volatile chemistry of juvenile volcanic glasses has suggested that shallow-stored crustal magmas often suffer the open-system addition of a carbon-dioxide-rich fluid from below, probably from a mantle-derived basaltic source ("carbon dioxide fluxing"). However, the actual mechanism of such a fluid transport is poorly understood. To constrain the volatile transport mechanism, we formulated this phenomenon as a reactive transport process and clarified the fundamental characteristics of chemical exchange in the system. The model assumes that a carbon-dioxide-rich fluid is introduced into a water-rich rhyolitic magma column from below and ascends at a constant velocity whilst a volatile exchange takes place between the fluid and melt. Two types of exchange modes were examined. One is the equilibrium mode where the volatile exchange is instantaneously achieved at all column depths. The second is the diffusive mode where the volatile exchange is rate limited by diffusion. In the equilibrium mode, the extent of re-equilibration of the entire column is controlled solely by the mass ratio of the integrated fluid to the melt. In the diffusive mode, the extent of re-equilibration is controlled by the Damkohler number, a dimensionless parameter representing the ratio of the advection time to the diffusion time. When the Damkohler number for carbon dioxide exceeds 10, the diffusive exchange becomes indistinguishable from the equilibrium exchange. Both exchange modes produce a negative correlation between the concentrations of carbon dioxide and water in the melt, which cannot be explained by conventional degassing models without significant crystallisation. The fluid emitted from the column as a volcanic gas changes its composition from carbon dioxide rich to water rich, and the emission rate decreases monotonically during fluxing. The simulation enables us to constrain the mechanism of fluid transport. For the melt inclusion data from the Bishop Tuff (Wallace et al., 1999; Anderson et al., 2000), fluid velocity in this magma was estimated to be 10(-6)-10(-7) m/s. The corresponding mechanism of fluid transport may include permeable flow with a permeability of similar to 10(-15) m(2) or a buoyant ascent of individual bubbles with a radius of 4-7 mm. (C) 2011 Elsevier B.V. All rights reserved.
• Transport of deep-derived carbon dioxide in magma plumbing systems

  YOSHIMURA Shumpei

  Japanese Magazine of Mineralogical and Petrological Sciences 日本鉱物科学会 40 (3) 101 - 114 1345-630X 2011/05/30 [Refereed][Not invited]
   

  Carbon dioxide fluxing is a recently proposed process in which a large amount of CO₂-rich vapour migrates in crustal magmatic systems. Such a proposal was derived from analytical studies on glass inclusions that have higher CO₂/H₂O ratios than those usually expected from a simple degassing process. The fluxing may be a universal phenomenon that occurs in various geological settings. However, its mechanisms, including the transport mode, duration and source, are still unclear. In this paper I review recent case studies on vapour transport in active volcanoes and discuss unsettled points and future studies.<br>
• Fracture healing in a magma: An experimental approach and implications for volcanic seismicity and degassing

  Yoshimura Shumpei, Nakamura Michihiko

  JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 115 0148-0227 2010/09/18 [Refereed][Not invited]
  
• Chemically driven growth and resorption of bubbles in a multivolatile magmatic system

  Yoshimura Shumpei, Nakamura Michihiko

  CHEMICAL GEOLOGY 276 (1-2) 18 - 28 0009-2541 2010/09 [Refereed][Not invited]
  
• Diffusive dehydration and bubble resorption during open-system degassing of rhyolitic melts

  Yoshimura Shumpei, Nakamura Michihiko

  JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH 178 (1) 72 - 80 0377-0273 2008/11/30 [Refereed][Not invited]
  
• Application of Hydrogen Isotope Geochemistry to Volcanology: Recent Perspective on Eruption Dynamics

  M. Nakamura, Y. Kasai, N. Sato, S. Yoshimura

  AIP Conference Proceedings 987 (93) 0094-243X 2008
• Study on permeability of magma chambers using X-ray microtomography

  Nakamura, M, Nakata, E, Nakano, T, Tsuchiyama, A, Uesugi, K, Ohuchi, T, Ohtaki, K, Yoshimura, S

  Spring-8 User Experimental Report 2005/03 [Invited]
  

MISC

• Fluid compositional distribution in the crust estimated from isochemical potential modelling

  Yoshimura Shumpei  Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences  2017-  8  2017  

  To understand the controls on the fluid compositional distribution in the crust, a thermodynamic model, which simulates the most stable distribution under pressure and temperature gradients, was established. NaCl solution was used as the representative of the crustal fluid. The model showed that the salinity increases with depth, and the salinity gradient is positively dependent on the temperature gradient. The calculation result was compared with natural salinity distribution of sedimentary fluids, and the calculated profiles are roughly consistent with natural data.
• Formation of dense lava from vesicular silicic magma

  Yoshimura Shumpei, Nakagawa Mitsuhiro  Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences  2016-  13  2016  

  Foam collapse is the necessary process for explaining non-explosive silicic eruptions. However, no direct evidence showed that the foam collapse was actually operating in natural magma. We analysed groundmass glass of Mukaiyama rhyolite lava using an FE-EPMA, and observed spatial heterogeneity in the volatile content. We interpret this heterogeneity as reflecting the history of degassing and compaction of magma.
• S-03 Experimental and theoretical studies on elementary processes of volcanic eruption

  Yoshimura S  Programme and abstracts the Volcanological Society of Japan  2015-  95  2015/09/28  [Not refereed][Not invited]
  
• S-03 Experimental and theoretical studies on elementary processes of volcanic eruption

  Yoshimura S  PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN  2015-  (0)  2015  [Not refereed][Not invited]
  
• Non-volatility of chlorine upon magmatic degassing

  Yoshimura Shumpei  Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences  2014-  2  2014  

  Chlorine and water contents were determined for pyroclastic vitrophyre fragments from Niijima Mukaiyama volcano and experimentally-vesiculated rhyolitic glass samples. As for the pyroclastic vitrophyre, the water content ranged from 0.5 to 2.4 wt%, whereas the chlorine content was almost constant at 0.13 wt%. For the experimental samples, the water content ranged from 0.15 to 0.61 wt% whereas the chlorine content was constant at 0.15 wt%. These results showed that chlorine behaves as a non-volatile element upon shallow magmatic degassing.
• Microanalysis of H_2O and CO_2 in glasses using Raman spectroscopy

  YOSHIMURA S, KAGASHIMA S  日本鉱物科学会年会講演要旨集  2013-  40  2013/09/05  [Not refereed][Not invited]
   

  We have developed a new analytical method for H₂O and CO₂ in silicate glasses by using micro-Raman spectrometry. We analysed H₂O- and CO₂-bearing basaltic glasses using a Raman spectrometer and an FT-IR, and confirmed linear relationships between peak heights of H₂O and CO₃^2- in IR spectra and those in Raman spectra. Therefore, the Raman spectrometry has a potential for quantitative analysis of both H₂O and CO₂ in glass samples.
• Carbon isotope fractionation between granitic melt and CO_2-rich fluid

  YOSHIMURA S., NAKAMURA M., YURIMOTO H.  日本鉱物科学会年会講演要旨集  2012-  29  -29  2012/09/15  [Not refereed][Not invited]
  
• Carbon isotope fractionation between granitic melt and CO₂-rich fluid

  Yoshimura Shumpei, Nakamura Michihiko, Yurimoto Hisayoshi  Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences  2012-  (0)  28  -28  2012  [Not refereed][Not invited]
   

  The carbon isotopic fractionation between CO₂-rich fluid and granitic melt was determined to be Δ_f-m = +0.8‰ at 1200 °C and 10 kbar. Infrared spectrometry revealed that both CO₂ molecule and CO₃^2- are present in this melt. The carbon isotope fractionation is modelled as a linear function of the ratio of CO₃^-2 to CO_2molecule.
• P73 Formation mechanisms of obsidian layers in a lava flow

  Yoshimura S, Nakamura M  Programme and abstracts the Volcanological Society of Japan  2011-  2011/10/02  [Not refereed][Not invited]
  
• Transport mechanism of carbon dioxide in active volcanoes

  YOSHIMURA S, NAKAMURA M  日本鉱物科学会年会講演要旨集  2011-  83  2011/09/05  [Not refereed][Not invited]
  
• Transport mechanism of carbon dioxide in active volcanoes

  Yoshimura Shumpei, Nakamura Michihiko  Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences  2011-  (0)  81  -81  2011  [Not refereed][Not invited]
   

  Active volcanoes are the primary source for CO2 emission from the Earth's interior to the atmosphere. CO2 fluxing may be an elementary process of CO2 transport in a magma, but its mechanism has not been understood yet. We modelled the CO2 fluxing as a reactive transport process and compared the calculation result to melt inclusion data of Mt.Etna from literature. We obtained a quantitative understanding for CO2 fluxing such that fluid velocity is > 10-4 m/s and flux is 32 g/m2 s.
• P73 Formation mechanisms of obsidian layers in a lava flow

  Yoshimura S, Nakamura M  PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN  2011-  (0)  2011  [Not refereed][Not invited]
  
• 2-A07 Experimental study on fracture healing in a magma : implications for repetitive volcanic earthquakes

  Yoshimura Shumpei, Nakamura Michihiko  Programme and abstracts the Volcanological Society of Japan  2010-  2010/10/09  [Not refereed][Not invited]
  
• CO_2 gas fluxing in crustal magmatic systems

  YOSHIMURA Shumpei, NAKAMURA Michihiko  日本鉱物科学会年会講演要旨集  2010-  2010/09/23  [Not refereed][Not invited]
  
• 2-A07 Experimental study on fracture healing in a magma : implications for repetitive volcanic earthquakes

  Yoshimura Shumpei, Nakamura Michihiko  PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN  2010-  (0)  2010  [Not refereed][Not invited]
  
• 2-A07 Experimental study on fracture healing in a magma : implications for repetitive volcanic earthquakes

  Yoshimura Shumpei, Nakamura Michihiko  PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN  2010-  (0)  2010  [Not refereed][Not invited]
  
• CO2 gas fluxing in crustal magmatic systems

  Yoshimura Shumpei, Nakamura Michihiko  Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences  2010-  (0)  10  -10  2010  [Not refereed][Not invited]
   

  Recent geochemical studies on melt inclusions proposed that crustal magmas often suffer CO2 fluxing, a process in which a mantle-derived CO2-rich fluid flows through, and interacts with, an H2O-rich shallow-stored magma. However, the mechanisms of CO2-rich fluxing are scarcely understood. In order to explore fundamental properties of CO2 fluxing, we constructed a reactive transport model and examined how the volatile composition in the melt and fluid evolve temporally and spatially. The results allowed us to infer the velocity of the CO2-rich fluid flow. For example, in the case of the Etna's magma, in which CO2 fluxing is expected to have occur, we estimated the fluid velocity to be 10-4 m/s.
• Bubble growth and resorption in a magma upon CO2 fluxing

  Yoshimura Shumpei, Nakamura Michihiko  Abstracts of Annual Meeting of the Geochemical Society of Japan  57-  (0)  8  -8  2010  [Not refereed][Not invited]
   

  Geochemical studies on melt inclusions proposed that H2O-rich crustal magmas often suffer CO2 fluxing. In order to explore kinetics of H2O-CO2 interaction upon CO2 fluxing, we conducted volatile exchange experiments in an H2O-CO2-rhyolite system. We observed that bubbles pre-existing in an H2O-rich magma may dissolve to shrink as a result of volatile exchange with a CO2-rich fluxing fluid.
• P31 CO_2 gas flushing in a magma : A reactive transport model

  Yoshimura Shumpei, Nakamura Michihiko  Programme and abstracts the Volcanological Society of Japan  2009-  2009/10/10  [Not refereed][Not invited]
  
• P31 CO_2 gas flushing in a magma : A reactive transport model

  Yoshimura Shumpei, Nakamura Michihiko  PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN  2009-  (0)  2009  [Not refereed][Not invited]
  
• P31 CO_2 gas flushing in a magma : A reactive transport model

  Yoshimura Shumpei, Nakamura Michihiko  PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN  2009-  (0)  2009  [Not refereed][Not invited]
  
• B12 Chemical interaction between H_2O-rich bubbles and CO_2-rich fluid

  Yoshimura Shumpei, Nakamura Michihiko  Programme and abstracts the Volcanological Society of Japan  2008-  2008/10/10  [Not refereed][Not invited]
  
• B12 Chemical interaction between H₂O-rich bubbles and CO₂-rich fluid

  Yoshimura Shumpei, Nakamura Michihiko  PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN  2008-  (0)  2008  [Not refereed][Not invited]
  
• B12 Chemical interaction between H₂O-rich bubbles and CO₂-rich fluid

  Yoshimura Shumpei, Nakamura Michihiko  PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN  2008-  (0)  2008  [Not refereed][Not invited]
  
• Diffusive dehydration and bubble resorption in vesiculated rhyolitic melts

  YOSHIMURA Shumpei, NAKAMURA Michihiko  日本鉱物学会・学術講演会,日本岩石鉱物鉱床学会学術講演会講演要旨集  2007-  2007/09/22  [Not refereed][Not invited]
  
• Diffusive dehydration and bubble resorption in vesiculated rhyolitic melts

  Yoshimura Shumpei, Nakamura Michihiko  Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences  2007-  (0)  56  -56  2007  [Not refereed][Not invited]
   

  The mechanisms of open-system degassing are central to an understanding of the non-explosive eruption of silicic magmas. To investigate the behavior of bubbles during the degassing, we performed vesiculation experiments on rhyolitic melts using a semipermeable cell at 1000 °C for a period of 1–288 hours. The run charges showed a zonal structure composed of two regions: a central region within which the bubbles were concentrated (bubble-rich core, BC) and a bubble-free melt region surrounding the BC (bubble-free margin, BFM). With increasing heating duration, the thickness of the BFM increased via dissolution of the outermost bubbles in the BC. We found that diffusive dehydration occurred from the sample surface, and the bubbles were resorbed into the melt. We propose that diffusive dehydration followed by bubble resorption is an important elementary process of open-system degassing, which would occur along the open paths.

Books etc

• 自然科学実験

  吉村 俊平 (Contributor偏光顕微鏡で覗く岩石と鉱物の世界)
  2018