Overview of the stability and barrier functions of the granitic geosphere at the Kamaishi Mine: relevance to radioactive waste disposal in Japan

Yoshida, Hidekazu; Aoki, Kazuhiro; Semba, Takeshi; Ota, Ken Ichiro; Amano, Kenji; Hama, Katsuhiro; Kawamura, Makoto; Tsubota, Koji

doi:10.1016/s0013-7952(99)00140-4

Cited by 37 publications

(24 citation statements)

References 8 publications

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“…In this study, samples were collected in a drift at ---600 m below the surface in the former Kamaishi Mine, which was maintained as an in situ test site for geological disposal of high-level radioactive waste. Voluminous studies on structural geology, mineralogy, and radiometric ages [Yoshida et al, 2000] helped us to determine the sampling scheme. A horizontal geologic section at 250 m above sea level (Figure lb) …”

Section: Geological Setting and Samplingmentioning

confidence: 99%

Paleomagnetism, rock magnetism, and fission track dating of the Kurihashi Granodiorite in northeast Japan: Evidence for a Cretaceous hydrothermal event and differential rotation along the eastern Eurasian margin

Itoh¹,

Amano²,

Danhara³

2000

J. Geophys. Res.

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Section: Geological Setting and Samplingmentioning

confidence: 99%

Paleomagnetism, rock magnetism, and fission track dating of the Kurihashi Granodiorite in northeast Japan: Evidence for a Cretaceous hydrothermal event and differential rotation along the eastern Eurasian margin

Itoh¹,

Amano²,

Danhara³

2000

J. Geophys. Res.

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“…The fractures may have been formed as a result of these activities. Amano et al (1999) and Yoshida et al (2000) reported on the cooling and hydrothermal history of the Kurihashi granodiorite, according to their FT data of fracturefilling apatite and zircon and mineralogical observations. They suggested that the fracture-filling minerals with a high-temperature alteration type were formed at 80-90 Ma when the pluton was cooler than 300°C.…”

Section: Discussionmentioning

confidence: 99%

“…According to Amano et al (1999) and Yoshida et al (2000), at the fracture with red-colored alteration haloes at such locations as #20, #133 and #153, fracture filling minerals were changing from the high-temperature type The CVS sample was collected from a vein of greenish skarn, which contained minor pyrite crystals on the surface. All samples were collected together with their host wall rocks.…”

Section: Samplesmentioning

confidence: 99%

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An attempt to determine the age of geological fractures by applying Rb-Sr mineral isochron dating to fracture-filling minerals

Asahara

Tanaka

2007

Geochem. J.

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Geological fractures commonly contain the minerals calcite and zeolite, which have crystallized in the fracture after its formation. The minimum age of formation of the fracture can be estimated from the age of the fracture-filling minerals. We tried to determine the age of fracturing by applying the Rb-Sr mineral isochron method to the fracture-filling paragenetic calcite and zeolite samples from fractures in the Kurihashi granodiorite and a skarn in the Kamaishi mine in northeastern Japan.The age of crystallization of fracture-filling minerals was estimated to be in the range 74 to 58 Ma in the Kurihashi granodiorite. The main causes of fracturing were considered to be igneous activities and the cooling of magma. We could not determine ages for some of the fractures we investigated, probably because of the subsequent low-temperature alteration after fracturing, or because of host wall rock contamination of the fracture-filling mineral samples.The ages determined for fractures in the skarn pre-dated the skarnization process. It is possible that these fractures formed before the skarnization. However, selective leaching of rubidium during skarnization reduces the Rb/Sr ratio. Therefore, skarnization can have the effect of producing erroneously old Rb-Sr ages.From the initial 87 Sr/ 86 Sr ratios, we determined changes in the strontium isotopic ratio in the local groundwater from the Late Cretaceous through the Paleocene, noting a significant increase at 62 Ma.

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“…4 Savage, 1995, Alexander et al, 1988, 1990. 1 , Oyama and Chigira, 1999Chigira et al, 2002;, 1983 LPG 1 67 Ma , 1994 1000 m 500 m DH-5R1 Muraoka et al, 1998;Yoshida et al, 2005Yoshida et al, , 2013b Nishimoto and Yoshida, 2010Yoshida et al, 2000, 2013bYoshida et al, 2013b, 2014 Iwatsuki and Yoshida, 1999;Iwatsuki et al, 2002; Hasegawa, T., Nakata, K., Kondo, H., Goshima, K., Muramoto, S., Tomioka, Y., Goto, K. and Kashiwaya, K. , 2013,…”

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confidence: 99%

Ferric oxyhydroxide in underground geological environments and high-level radioactive waste disposal: Analysis of influence on nuclide migration scenarios

英一

鋼志

2014

Jour. Geol. Soc. Japan

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Ferric oxyhydroxide in subsurface geological environments may influence the long-term natural barrier function with respect to nuclide migration at potential sites of disposal of high-level radioactive wastes (HLW). Here, samples of ferric oxyhydroxide from the subsurface environment of Japan were studied in order to ( ) evaluate suitable repository depths that will need to be characterized; and ( ) assess how ferric oxyhydroxide will need to be treated with respect to nuclide migration at a future repository site. Analysis of the ferric oxyhydroxide provides the following insights into site characterization and the rock barrier function: ( ) ferric oxyhydroxide formed along a connective fracture network that extends from the surface to deep levels, but there is a depth limit of oxidation due to geochemical buffering by redox reactions; ( ) early-stage ferric oxyhydroxide remains stable even after the environment returns to reducing conditions; and ( ) ferric oxyhydroxide produced in the rock matrix can contribute to retarding nuclide migration by sorbing radionuclides and clogging micropores. The results show that ferric oxyhydroxide formed in the geological environment may influence the geosphere barrier function in and around subsurface repository caverns for the disposal of HLW in Japan.

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Overview of the stability and barrier functions of the granitic geosphere at the Kamaishi Mine: relevance to radioactive waste disposal in Japan

Cited by 37 publications

References 8 publications

Paleomagnetism, rock magnetism, and fission track dating of the Kurihashi Granodiorite in northeast Japan: Evidence for a Cretaceous hydrothermal event and differential rotation along the eastern Eurasian margin

Paleomagnetism, rock magnetism, and fission track dating of the Kurihashi Granodiorite in northeast Japan: Evidence for a Cretaceous hydrothermal event and differential rotation along the eastern Eurasian margin

An attempt to determine the age of geological fractures by applying Rb-Sr mineral isochron dating to fracture-filling minerals

Ferric oxyhydroxide in underground geological environments and high-level radioactive waste disposal: Analysis of influence on nuclide migration scenarios

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