Fractionation during formation of mineral/fluid inclusions: A new approach for understanding of rock-forming processes

2012 Fiscal Year Final Research Report

• Project/Area Number: 23654180
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Petrology/Mineralogy/Science of ore deposit
• Research Institution: Tohoku University
• Principal Investigator: OKAMOTO Atsushi 東北大学, 大学院・環境科学研究科, 准教授 (40422092)
• Project Period (FY): 2011 – 2012
• Keywords: 変成岩,鉱物包有物 / 流体包有物 / 水熱実験 / 石英 / 変成岩 / ざくろ石

Research Abstract

I have revealed what controls the formation of fluid/mineral inclusions in porphyroblasts, based on hydrothermal experiments on quartz crystal growth and the analyses of garnets in the metamorphic rocks.

Research Products

• [Journal Article] Mineralogical variation of silica induced by Al and Na in hydrothermalsolutions (2012)
  • Author(s): Saishu H., Okamoto A., Tsuchiya N.
  • Journal Title: American Mineralogist Volume: 97 Pages: 2060-2063
  • DOI: DOI:10.2138/am.2012.4258
  • Peer Reviewed
• [Journal Article] An exhumation pressure-temperature path and fluid activities during metamorphism in the Tseel terrane, SW Mongolia: Constraints from aluminosilicate-bearing quartz veins and garnet zonings in metapelites (2012)
  • Author(s): Burenjargal U., Okamoto A., Meguro Y., Tsuchiya N.
  • Journal Title: Journal of Asian Earth Sciences Volume: 54-55 Pages: 214-229
  • DOI: DOI:10.1016/j.jseaes.2012.04.017
  • Peer Reviewed
• [Journal Article] Textures of syntaxial quartz veins synthesized by hydrothermal experiments (2011)
  • Author(s): Okamoto, A., Sekine, K.
  • Journal Title: Journal of Structural Geology Volume: 33 Pages: 1764-1775
  • DOI: DOI:10.1016/j.jsg.2011.10.004
  • Peer Reviewed
• [Journal Article] In situ observation of the crystallization pressure induced by halite crystal growth in a microfluidic channel (2011)
  • Author(s): Sekine, K., Okamoto, A., Hayashi, K.
  • Journal Title: American Mineralogist Volume: 96 Pages: 1012-1019
  • DOI: DOI:10.2138/am.2011.3765
  • Peer Reviewed
• [Journal Article] Thermodynamic forward modeling of progressive dehydration reactions during subduction of oceanic crust under greenschist facies conditions (2011)
  • Author(s): Kuwatani, T., Okamoto, A., Toriumi, M.
  • Journal Title: Earth and Planetary Science Letters Volume: 307 Pages: 9-18
  • DOI: DOI:10.1016/j.epsl.2011.01.027
  • Peer Reviewed
• [Presentation] Variation of garnet zoning pattern in the pelitic gneisses and it's implications to thermal history of Tseel terrane, SW Mongolia (2013)
  • Author(s): Burenjargal Ulziiburen, Atsushi Okamoto and Noriyoshi Tsuchiya
  • Organizer: 34^<th> International Geological Congress
  • Place of Presentation: Brisbane, Australia
  • Year and Date: 2013-08-07
• [Presentation] Silica precipitation in sub to supercritical water:implications to hydrological system in the Kakkonda Geothermal field (2013)
  • Author(s): Okamoto A., Saishu H., Yamada R., Hirano N., Tsuchiya N.
  • Organizer: 10th International Workshop on Water dynamics
  • Place of Presentation: Tohoku University
  • Year and Date: 2013-03-13
• [Presentation] The formation of the hydrothermal-convection zone and the heat-conduction zone in Kakkonda geothermal field by quartz precipitation (2013)
  • Author(s): Saishu H., Okamoto A., Tsuchiya N.
  • Organizer: 10th International Workshop on Water dynamics
  • Place of Presentation: Tohoku University
  • Year and Date: 2013-03-13
• [Presentation] Experimental study on observation of critical behaviors of multicomponent geofluids by spectroscopic measurement (2013)
  • Author(s): Sekiguchi C., Hirano N. Okamoto A., Tsuchiya N.
  • Organizer: 10th International Workshop on Water dynamics
  • Place of Presentation: Tohoku University
  • Year and Date: 2013-03-13
• [Presentation] Distribution of C-H-O fluids in the accretionary prism deduced from fluid inclusions from the Shimanto belt in the Muroto area, SW Japan (2013)
  • Author(s): Musha M., Okamoto A., Tsuchiya N.
  • Organizer: 10th International Workshop on Water dynamics
  • Place of Presentation: Tohoku University
  • Year and Date: 2013-03-13
• [Presentation] 石英核形成に対するAl・Naの影響:地熱帯の石英脈とシリカスケール形成における重要性 (2012)
  • Author(s): 最首花恵・岡本敦・土屋範芳
  • Organizer: 日本地熱学会平成24年湯沢大会
  • Place of Presentation: 湯沢
  • Year and Date: 20121024-26
• [Presentation] The effect of Aluminum and Sodium to precipitation of silica minerals (2012)
  • Author(s): H. Saishu, A. Okamoto, N. Tsuchiya
  • Organizer: 34th International Geological Congress
  • Place of Presentation: Brisbane, Australia
  • Year and Date: 20120805-10
• [Presentation] 熱水に含まれるAlとNaのシリカ鉱物析出に及ぼす影響 (2012)
  • Author(s): 最首花恵,岡本敦,土屋範芳
  • Organizer: 日本地球科学連合2012年大会
  • Place of Presentation: 千葉
  • Year and Date: 20120520-27
• [Presentation] 鉱物包有物の形成過程:ざくろ石班状変晶中の石英の例 (2012)
  • Author(s): 岡本敦・福田惇一・武藤潤
  • Organizer: 日本地質学会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2012-09-17
• [Presentation] Precipitation of silica minerals from hydrothermal solutions: effect of trace amount of Al (2012)
  • Author(s): Okamoto A., H. Saishu and N. Tsuchiya
  • Organizer: International symposium on Geolfuids
  • Place of Presentation: Okayama
  • Year and Date: 2012-03-19
• [Presentation] Hydrothermal experiments on formation of quartz/calcite veins at crustal conditions (2012)
  • Author(s): Okamoto A., H. Saishu and N. Tsuchiya
  • Organizer: International Conference on a New Perspective of Great Earthquakes along Subduction zones
  • Place of Presentation: Kochi
  • Year and Date: 2012-02-28
• [Presentation] Effects of Al on mineralogy and kinetics of precipitation of silica minerals under crustal conditions (2011)
  • Author(s): H. Saishu, A. Okamoto, N. Tsuchiya
  • Organizer: American Geophysical Union2011 Fall Meeting
  • Place of Presentation: San Francisco, U.S.A.
  • Year and Date: 20111205-09
• [Presentation] 微細流路内のNaCl析出に伴う結晶成長力のその場観察 (2011)
  • Author(s): 岡本敦、関根孝太郎
  • Organizer: 日本鉱物科学会
  • Place of Presentation: 茨城大学
  • Year and Date: 2011-09-10
• [Presentation] 核形成を伴うシリカ鉱物析出速度式の提案と鉱物脈形成に関する考察 (2011)
  • Author(s): 最首花恵・岡本敦・土屋範芳
  • Organizer: 日本鉱物科学会
  • Place of Presentation: 茨城大学
  • Year and Date: 2011-09-09
• [Presentation] 水熱環境下における方解石析出の実験的検討 (2011)
  • Author(s): 武者倫正・岡本敦・土屋範芳
  • Organizer: 日本鉱物科学会
  • Place of Presentation: 茨城大学
  • Year and Date: 2011-09-09