鉱物脈組織から読み解く地殻流体流動

• 岡本 敦

  東北大学大学院環境科学研究科

書誌事項

タイトル別名

• Vein texture: a window for fluid dynamics in the crust

抄録

  Fluids in the Earth's crust play crucial roles in various geological phenomena including earthquakes, volcanism and formation of ore deposits. Mineral-filling veins are fossils of fluid-filled fractures, but it is not easy to extract information on nature of fluid flow during vein formation. Mineral veins in the metamorphic rocks show systematic variation in internal textures (grain shape, mineral distribution, crystallographic orientation, relation to the host rock) as a function of aperture size and host rock. Hydrothermal experiments for silica precipitation have revealed that the occurrences and mineralogy of silica minerals are strongly controlled by solution chemistry (supersaturation, minor elements), rock substrates (quartz distribution, grain size), fracture geometry (aperture distribution, surface roughness) as well as temperature, which results in a variation in vein texture. Combining modeling and analyses of natural and synthetic veins, vein texture is a potentially useful indicator of hydrological properties (flow velocity, flow direction, degree of supersaturation, duration of sealing etc.) in the crust.<br>

収録刊行物

• 岩石鉱物科学

  岩石鉱物科学 43 (1), 25-29, 2014

  一般社団法人　日本鉱物科学会

キーワード

• Mineral vein
• Texture
• Fluid flow
• Permeability
• Geothermal area
• Crust
• Hydrothermal experiments

詳細情報

• CRID: 1390282681503205632
• NII論文ID: 130003391973
• DOI: 10.2465/gkk.131129
• ISSN: 13497979
• ISSN: 1345630X
• 本文言語コード: ja
• データソース種別:
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  • Crossref
  • CiNii Articles
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• 抄録ライセンスフラグ: 使用不可