干旱区生态环境知识资源中心(Arid): Status of volcanic hazard studies for the Nevada Nuclear Waste Storage Investigations. Volume II

Arid

DOI	10.2172/59818
报告编号	LA--9325-MS-Vol.2
来源ID	OSTI_ID: 59818
	Status of volcanic hazard studies for the Nevada Nuclear Waste Storage Investigations. Volume II
	Crowe, B.M.; Wohletz, K.H.; Vaniman, D.T.; Gladney, E.; Bower, N.
英文摘要	Volcanic hazard investigations during FY 1984 focused on five topics: the emplacement mechanism of shallow basalt intrusions, geochemical trends through time for volcanic fields of the Death Valley-Pancake Range volcanic zone, the possibility of bimodal basalt-rhyolite volcanism, the age and process of enrichment for incompatible elements in young basalts of the Nevada Test Site (NTS) region, and the possibility of hydrovolcanic activity. The stress regime of Yucca Mountain may favor formation of shallow basalt intrusions. However, combined field and drill-hole studies suggest shallow basalt intrusions are rare in the geologic record of the southern Great Basin. The geochemical patterns of basaltic volcanism through time in the NTS region provide no evidence for evolution toward a large-volume volcanic field or increases in future rates of volcanism. Existing data are consistent with a declining volcanic system comparable to the late stages of the southern Death Valley volcanic field. The hazards of bimodal volcanism in this area are judged to be low. The source of a 6-Myr pumice discovered in alluvial deposits of Crater Flat has not been found. Geochemical studies show that the enrichment of trace elements in the younger rift basalts must be related to an enrichment of their mantle source rocks. This geochemical enrichment event, which may have been metasomatic alteration, predates the basalts of the silicic episode and is, therefore, not a young event. Studies of crater dimensions of hydrovolcanic landforms indicate that the worst case scenario (exhumation of a repository at Yucca Mountain by hydrovolcanic explosions) is unlikely. Theoretical models of melt-water vapor explosions, particularly the thermal detonation model, suggest hydrovolcanic explosion are possible at Yucca Mountain. 80 refs., 21 figs., 5 tabs.
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 ; YUCCA MOUNTAIN ; VOLCANISM ; GEOCHEMISTRY ; BASALT ; CHEMICAL COMPOSITION ; MAGMA ; INTRUSION ; ROCK-FLUID INTERACTIONS ; DETONATIONS ; EXPLOSIONS ; RADIOACTIVE WASTE DISPOSAL ; RISK ASSESSMENT ; TECTONICS ; ISOTOPE RATIO ; STRONTIUM 86 ; NEODYMIUM 143 ; NEODYMIUM 144 ; TRACE AMOUNTS ; PARTICLE SIZE ; EXPERIMENTAL DATA ; Yucca Mountain Project
URL	http://www.osti.gov/scitech/servlets/purl/59818
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/260148
推荐引用方式 GB/T 7714	Crowe, B.M.,Wohletz, K.H.,Vaniman, D.T.,et al. Status of volcanic hazard studies for the Nevada Nuclear Waste Storage Investigations. Volume II,1986.