Evidence for Enhanced Matrix Diffusion in Geological Environment
スポンサーリンク
概要
- 論文の詳細を見る
Molecular diffusion in rock matrix, called as matrix diffusion, has been appreciated as a static process for elemental migration in geological environment that has been acknowledged in the context of geological disposal of radioactive waste. However, incomprehensible enhancement of matrix diffusion has been reported at a number of field test sites. Here, the matrix diffusion of saline water at Horonobe, Hokkaido, Japan is highlighted directly probing angstrom-scale pores on a field scale up to 1 km by positron--positronium annihilation spectroscopy. The first application of positron--positronium annihilation spectroscopy to field-scale geophysical research reveals the slight variation of angstrom-scale pores influenced by saline water diffusion with complete accuracy. We found widely interconnected 3 Å pores, which offer the pathway of saline water diffusion with the highly enhanced effective matrix diffusion coefficient of 4\times 10^{-6} cm2 s-1. The present findings provide unambiguous evidence that the angstrom-scale pores enhance effective matrix diffusion on a field scale in geological environment.
- 2013-01-15
著者
-
Nakata Masataka
Department Of Astronomy And Earth Science Tokyo Gakugei University
-
Sato Kiminori
Department Of Electrical Communication Faculty Of Engineering Tohoku University
-
SHIKAZONO Naotatsu
Department of Applied Chemistry (Earth System Sciences), Keio University
-
Fujimoto Koichiro
Department of Environmental Sciences, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan
-
Fujimoto Koichiro
Department of Astronomy and Earth Sciences, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan
-
Shikazono Naotatsu
Department of Astronomy and Earth Sciences, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan
関連論文
- 152. A Study of the Conjunctival Vessels during Convulsion.
- Mineralogical and biological influences on groundwater chemistry of the Boso Peninsula, Chiba, central Japan : Implications for the origin of groundwater in sedimentary basins
- Human Face Extraction and Recognition Using Radial Basis Function Networks
- Atomic-Scale Structural Evolution upon Crystallite Nucleation and Growth in Amorphous Fe78B13Si9
- Mechanism of Bi Precipitation in Sn65.4Bi34.6 Eutectic System
- Experimental study on metasomatism in huebnerite : CaCl_2 solution system
- Sound-Producing Sand in Japan : Major Element Composition and Its Minerals Determined by X-ray Diffraction and X-ray Fluorescence
- An estimate of dissolution rate constant of volcanic glass in volcanic ash soil from the Mt. Fuji area, central Japan
- Chemical process and environment of hydrothermal alteration of acidic volcanic rocks in the Mitsuishi district, southwest Japan
- Relationship between Bridge Energy and Metallic Phase Arc Duration in Electric Contacts
- Chemistry and Occurrences of Native Tellurium from Epithermal Gold Deposits in Japan
- Evidence for Enhanced Matrix Diffusion in Geological Environment
- Positron-Annihilation Studies of Frank-Kasper-Type Quasicrystals of the Mg–Zn–Ga–Al and the Mg–Zn–Rare-Earth System
- Interpretation of Mineral Zoning in Submarine Hydrothermal Ore Deposits in Terms of Coupled Fluid Flow-Precipitation Kinetics Model
- Compositional Variation of Hydrothermally Altered Volcanic Rocks in Hishikari Gold Epithermal System : A Useful Geochemical Indicator of Gold-Silver Epithermal Mineralization