Fault Activity in Clay Rock Site Candidate of High Level Radioactive Waste Repository, Tamusu, Inner Mongolia

Abstract

Tamusu area in Inner Mongolia is one of the favorable site candidates for high level radioactive waste (HLW) repository, which requires a stable regional tectonic environment. Field investigation, mossbauer spectroscopy, major elements, carbon and oxygen isotope and quartz micro morphology of fault gouge and host rock of three faults in the site candidate were conducted. The results show that the F2 and F7 faults on the north and south sides of the site candidate are in a relatively stable state with good sealing and weak activity. Part of the F4 fault is located in the site candidate, and the deportment of a small amount of pyrite in the fault zone and the difference of carbon and oxygen isotopes indicate that it may have experienced material exchange with the deep zone. Attention should be paid to induced earthquake risk.

Characteristics and Geological Significance of Lacustrine Hydrothermal Sedimentary Rocks in the Yingejing Sag in Bayingebi Basin, Inner Mongolia, Northwestern China

“…The area of the site should not be less than 10 km 2 , the continuous distribution of the argillaceous rock geological body should not be less than 100 m, the underground extension width of the clay rock should not be less than 2 km, and the depth of the geological body should be in the range 300–1000 m. , The dimensions of the upper argillites of the Bayingebi Formation exceed these international selection guidelines. Moreover, the fault activities in the Tamusu area mainly occurred in the Cretaceous and before the Cretaceous, indicating that there has been almost no obvious fault activity since the Quaternary . Certainly, intensive investigations and long-term stability monitoring should be carried out in the Tamusu preselected area.…”

“…The overall trend of faults, the secondary faults of ATF, in the area is NE or near-EW. The near-EW direction represents earlier faults than the NE direction . These faults control the interfacial structure of the basin as well as the type and spatial distribution of the sedimentary system.…”

“…The near-EW direction represents earlier faults than the NE direction. 20 These faults control the interfacial structure of the basin as well as the type and spatial distribution of the sedimentary system. The basement of the Yingejing Sag is composed of Archean, Proterozoic, and Paleozoic metamorphic rocks.…”

Lithology-Controlled Hydrodynamic Behaviour of a Fractured Sandstone–Claystone Body in a Radioactive Waste Repository Site, SW Hungary

“…This is the Boda Claystone Formation (BCF); a formation with very low porosity and low permeability, that provides good retention properties for the repository. In addition to the intrinsic properties of the argillaceous rock, the host formation and the overlying and underlying formations must have specific favourable properties to be considered a possible site for a nuclear waste repository [2,3]. Exploration and investigation of the adjacent rock formations are critical, especially the investigation of the fracture networks that may developed across the formations.…”

Water and ion diffusion in partially-water saturated compacted kaolinite: Role played by vapor-phase diffusion in water mobility

“…Owing to their high retention capacity and their very low permeability, clay-rich media are widely used as barriers against contaminant spreading in many fields. Disposal facilities for high-and intermediate level long-lived radioactive waste, in many proposed designs, rely on swelling clay materials as engineered barriers (Bucher and Müller-Vonmoos, 1989;Landais, 2006) and some disposal facilities should also be directly sited in deep argillaceous formations (ANDRA, 2005;Hendry et al, 2015;Rao et al, 2021). Liners used in subsurface waste landfills are usually made of clay materials (Foose et al, 2002;Katsumi et al, 2001).…”