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| DOI | 10.2172/5993747 |
| 报告编号 | PNL-2776 |
| 来源ID | OSTI_ID: 5993747 |
| Naturally occurring glasses: analogues for radioactive waste forms | |
| Ewing, R.C.; Haaker, R.F. | |
| 英文摘要 | Volcanic glasses are very often altered by weathering and leaching and recrystallize to their fine-grained equivalents (rhyolites, felsites). The oldest volcanic glasses are dated at 40 million years before the present, but the majority are much younger. Devitrification textures was produced experimentally; and hydration rates for volcanic glasses were determined as a function of composition, temperature, and climate. Presence of water and temperature are the most important rate controlling variables. Even material that may still be described as glassy often exhibits evidence of alteration and recrystallization. Of the volcanic glasses that are preserved in the geologic record, it would be rare to describe such a glass as pristine. Despite the common alteration and recrystallization effects observed in volcanic glasses, glasses formed as a result of impact, tektites and lunar glasses, may occur in substantially unaltered form. In the case of tektites, their resistance to alteration is a result of their high SiO/sub 2/ content and low alkali content. Lunar glasses have been preserved for hundreds of millions of years because they exist in an environment with a low oxygen fugacity and an extremely low water vapor partial presssure. Thus one might expect glasses of particular compositions or in specific types of environment to be stable for long periods of time. These conclusions are applied to radioactive waste disposal over several time periods (0-30h, 30h-20y, 20-200y). |
| 出版年 | 1979 |
| 报告类型 | Technical Report |
| 语种 | 英语 |
| 国家 | 美国 |
| 来源学科分类 | 12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES ; 58 GEOSCIENCES ; GLASS ; STABILITY ; LUNAR MATERIALS ; RADIOACTIVE WASTE DISPOSAL ; PERFORMANCE ; TEKTITES ; VOLCANIC ROCKS ; AGE ESTIMATION ; CHEMICAL COMPOSITION ; PHYSICAL PROPERTIES ; RECRYSTALLIZATION ; TIME DEPENDENCE ; IGNEOUS ROCKS ; MANAGEMENT ; MINERALS ; ROCKS ; WASTE DISPOSAL ; WASTE MANAGEMENT 052002* -- Nuclear Fuels-- Waste Disposal & Storage ; 580300 -- Mineralogy, Petrology, & Rock Mechanics-- (-1989) |
| URL | http://www.osti.gov/scitech/servlets/purl/5993747 |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/262305 |
| 推荐引用方式 GB/T 7714 | Ewing, R.C.,Haaker, R.F.. Naturally occurring glasses: analogues for radioactive waste forms,1979. |
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