干旱区生态环境知识资源中心(Arid): Multiple episodes of hydrothermal activity and epithermal mineralization in the southwestern Nevada volcanic field and their relations to magmatic activity, volcanism and regional extension

Arid

DOI	10.2172/240930
报告编号	DOE/NV/10461--T46
来源ID	OSTI_ID: 240930
	Multiple episodes of hydrothermal activity and epithermal mineralization in the southwestern Nevada volcanic field and their relations to magmatic activity, volcanism and regional extension
	Weiss, S.I.; Noble, D.C.; Jackson, M.C. [Univ. of Nevada, Reno, NV (United States)] [and others]
英文摘要	Volcanic rocks of middle Miocene age and underlying pre-Mesozoic sedimentary rocks host widely distributed zones of hydrothermal alteration and epithermal precious metal, fluorite and mercury deposits within and peripheral to major volcanic and intrusive centers of the southwestern Nevada volcanic field (SWNVF) in southern Nevada, near the southwestern margin of the Great Basin of the western United States. Radiometric ages indicate that episodes of hydrothermal activity mainly coincided with and closely followed major magmatic pulses during the development of the field and together spanned more than 4.5 m.y. Rocks of the SWNVF consist largely of rhyolitic ash-flow sheets and intercalated silicic lava domes, flows and near-vent pyroclastic deposits erupted between 15.2 and 10 Ma from vent areas in the vicinity of the Timber Mountain calderas, and between about 9.5 and 7 Ma from the outlying Black Mountain and Stonewall Mountain centers. Three magmatic stages can be recognized: the main magmatic stage, Mountain magmatic stage (11.7 to 10.0 Ma), and the late magmatic stage (9.4 to 7.5 Ma).
出版年	1994
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	05 NUCLEAR FUELS ; 58 GEOSCIENCES ; 54 ENVIRONMENTAL SCIENCES ; HIGH-LEVEL RADIOACTIVE WASTES ; UNDERGROUND DISPOSAL ; NEVADA ; VOLCANISM ; MINERALS ; HYDROTHERMAL ALTERATION ; YUCCA MOUNTAIN ; SITE CHARACTERIZATION ; CALDERAS ; FLUORITE ; LAVA ; MINERALIZATION ; SEDIMENTARY ROCKS ; VOLCANIC ROCKS ; TUFF ; GEOLOGIC FAULTS ; ISOTOPE DATING ; PROGRESS REPORT
URL	http://www.osti.gov/scitech/servlets/purl/240930
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/265968
推荐引用方式 GB/T 7714	Weiss, S.I.,Noble, D.C.,Jackson, M.C. [Univ. of Nevada, Reno, NV . Multiple episodes of hydrothermal activity and epithermal mineralization in the southwestern Nevada volcanic field and their relations to magmatic activity, volcanism and regional extension,1994.