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- W2384276585 abstract "Investigating the far-field geochemical environment of a deep geological repository of high-level radioactive waste (HRW) is an important work for evaluating the safety performance of a HRW deep disposal repository. The study of filling minerals provides an opportunity for reconstructing the palaeoenvironment and evolution history of the formation of rocks and minerals. For the first pre-selected site of HRW deep disposal repositories in Beishan, Gansu Province, China, Carbon, Oxygen and Rb-Sr isotopes and U-series nuclides from such fillings as calcite and quartz at different depths in granite show that there are four different geochemical environments. ① In the shallow part (from the surface to a depth of 150 m), δ 18O(SMOW)=12.1‰~ 13.0‰, δ 13C(PDB)=-9.5‰~-10.1‰, δ 87Sr=-3.24‰~-1.09‰, the fillings were formed from low-temperature fluids and meteoric water. ② In the upper—middle part (150~350 m), δ 18O(SMOW)= 13.3‰~18.0‰, δ 87Sr≈0, δ 13C(PDB)=-11.2‰~-10.5‰, the fillings were formed from multi-source fluids, mainly meteoric water and basin brine in a weak reduction environment. The U-series specific radioactivity also implies a relatively stable groundwater environment without influence of fresh water or modern groundwater. ③ In the lower—middle part (350~550m): the fillings were formed in a relatively stable environment controlled by groundwater with two different features. ④ In the deepest part (below 550 m), the granite is very homogeneous in geochemistry. The stable and radioactive isotope data show that geochemical reactions between groundwater and granite were in a secular equilibrium condition. This is a good geochemical environment for long-term geologic disposal of HRW." @default.
- W2384276585 created "2016-06-24" @default.
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- W2384276585 date "2004-01-01" @default.
- W2384276585 modified "2023-09-23" @default.
- W2384276585 title "Isotopic Geochemistry of the Deep Granite under the Pre-selected Site of Deep Geological Repositories for High-level Radioactive Waste" @default.
- W2384276585 hasPublicationYear "2004" @default.
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