干旱区生态环境知识资源中心(Arid): Chemistry of diagenetically altered tuffs at a potential nuclear waste repository, Yucca Mountain, Nye County, Nevada

Arid

DOI	10.2172/59981
报告编号	LA--10802-MS
来源ID	OSTI_ID: 59981
	Chemistry of diagenetically altered tuffs at a potential nuclear waste repository, Yucca Mountain, Nye County, Nevada
	Broxton, D.E.; Warren, R.G.; Hagan, R.C.; Luedemann, G.
英文摘要	The chemistry of diagenetically altered tuffs at a potential nuclear waste repository, Yucca Mountain, Nevada is described. These tuffs contain substantial amounts of zeolites that are highly sorptive of certain radionuclides. Because of their widespread distribution, the zeolitic tuffs could provide important barriers to radionuclide migration. Physical properties of these tuffs and of their constituent zeolites are influenced by their chemical compositions. This study defines the amount of chemical variability within diagenetically altered tuffs and within diagenetic minerals at Yucca Mountain. Zeolitic tuffs at Yucca Mountain formed by diagenetic alteration of rhyolitic vitric tuffs. Despite their similar starting compositions, these tuffs developed compositions that vary both vertically and laterally. Widespread chemical variations were the result of open-system chemical diagenesis in which chemical components of the tuffs were mobilized and redistributed by groundwaters. Alkalies, alkaline earths, and silica were the most mobile elements during diagenesis. The zeolitic tuffs can be divided into three compositional groups: (1) calcium- and magnesium-rich tuffs associated with relatively thin zones of alteration in the unsaturated zone; (2) tuffs in thick zones of alteration at and below the water table that grade laterally from sodic compositions on the western side of Yucca Mountain to calcic compositions on the eastern side; and (3) potassic tuffs at the north end of Yucca Mountain. Physical properties of tuffs and their consistuent zeolites at Yucca Mountain may be affected by variations in compositions. Properties important for assessment of repository performance include behavior and ion exchange.
出版年	1986
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	58 GEOSCIENCES ; 05 NUCLEAR FUELS ; 40 CHEMISTRY ; TUFF ; DIAGENESIS ; CHEMICAL COMPOSITION ; YUCCA MOUNTAIN ; CHEMISTRY ; ZEOLITES ; NEVADA TEST SITE ; Yucca Mountain Project
URL	http://www.osti.gov/scitech/servlets/purl/59981
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/263869
推荐引用方式 GB/T 7714	Broxton, D.E.,Warren, R.G.,Hagan, R.C.,et al. Chemistry of diagenetically altered tuffs at a potential nuclear waste repository, Yucca Mountain, Nye County, Nevada,1986.