Distribution of Diagenetic Minerals in the Neogene Diatomaceous Sediments of Horonobe, Hokkaido: Implication for Recharge and Discharge of Ground Water.
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The research and development on geological disposal of high-level radioactive waste from the atomic power generation has been carried out in the Horonobe field, the north-western Hokkaido.In the Horonobe field, investigations of 8 boreholes were carried out as the Horonobe Underground Research Laboratory Project by 2004. These investigations clarify the diagenetic mineralogy and water chemistry, and show that the geology comprises the diatomaceous sediments containing pyrite, calcite and siderite as authigenic accessory minerals, and that the groundwater is a mixture between meteoric water in shallow depth and saline water in deep underground.<BR>Relative abundance of pyrite and carbonate is estimated by X-ray diffraction analyses, mode analyses of thin section, and whole rock compositions of SO42, TIC (Total Inorganic Carbon) and (Fe24-/total Fe).Based on the mineralogical analyses, the mineral fronts where relative abundance of the minerals abruptly changes are confirmed.Comparing the mineral fronts with the corresponding water chemistry, the mineral fronts of 2 boreholes in the western part of the field are situated in the saline water zone, but these of other boreholes are situated in the meteoric water zone. Assuming that pyrite and carbonate are stable in the saline water zone because these minerals abundantly occur in the saline water zone, the mineral front in the meteoric water zone is supposed to be remained in spite of water/rock interaction. The occurrence of the mineral fronts in the respected water zones would be attributed to kinetic interaction, suggesting that saline water is discharged upward in the western part of the field, and that meteoric water is recharged downward in other area.
- 日本地熱学会の論文
日本地熱学会 | 論文
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