干旱区生态环境知识资源中心(Arid): Impact of Quaternary Climate on Seepage at Yucca Mountain, Nevada

Arid

DOI	10.2172/893805
报告编号	NA
来源ID	OSTI_ID: 893805
	Impact of Quaternary Climate on Seepage at Yucca Mountain, Nevada
	J.F. Whelan; J.B. Paces; L.A. Neymark; A.K. Schmitt; M. Grove
英文摘要	Uranium-series ages, oxygen-isotopic compositions, and uranium contents were determined in outer growth layers of opal and calcite from 0.5- to 3-centimeter-thick mineral coatings hosted by lithophysal cavities in the unsaturated zone at Yucca Mountain, Nevada, the proposed site of a permanent repository for high-level radioactive waste. Micrometer-scale growth layering in the minerals was imaged using a cathodoluminescence detector on a scanning electron microscope. Determinations of the chemistry, ages, and delta oxygen-18 values of the growth layers were conducted by electron microprobe analysis and secondary ion mass spectrometry techniques at spatial resolutions of 1 to about 20 micrometers ({micro}m) and 25 to 40 micrometers, respectively. Growth rates for the last 300 thousand years (k.y.) calculated from about 300 new high-resolution uranium-series ages range from approximately 0.5 to 1.5 {micro}m/k.y. for 1- to 3-centimeter-thick coatings, whereas coatings less than about I-centimeter-thick have growth rates less than 0.5 {micro}m/k.y. At the depth of the proposed repository, correlations of uranium concentration and delta oxygen-18 values with regional climate records indicate that unsaturated zone percolation and seepage water chemistries have responded to changes in climate during the last several hundred thousand years.
出版年	2006
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES ; CALCITE ; CATHODOLUMINESCENCE ; CAVITIES ; CHEMISTRY ; CLIMATES ; COATINGS ; ELECTRON MICROPROBE ANALYSIS ; ELECTRON MICROSCOPES ; HIGH-LEVEL RADIOACTIVE WASTES ; MASS SPECTROSCOPY ; OPALS ; OXYGEN 18 ; SPATIAL RESOLUTION ; URANIUM ; WATER ; YUCCA MOUNTAIN
URL	http://www.osti.gov/scitech/servlets/purl/893805
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/269147
推荐引用方式 GB/T 7714	J.F. Whelan,J.B. Paces,L.A. Neymark,et al. Impact of Quaternary Climate on Seepage at Yucca Mountain, Nevada,2006.