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报告编号	PB2006105334
	Ground-Magnetic Studies of the Amargosa Desert Region, California and Nevada.
	Blakely, R. J; Hillhouse, J. W; Morin, R. L.
英文摘要	High-resolution aeromagnetic surveys of the Amargosa Desert region, California and Nevada, exhibit a diverse array of magnetic anomalies reflecting a wide range of mid- and upper-crustal lithologies. In most cases, these anomalies can be interpreted in terms of exposed rocks and sedimentary deposits. More difficult to explain are linear magnetic anomalies situated over lithologies that typically have very low magnetizations. Aeromagnetic anomalies are observed, for example, over thick sections of Quaternary alluvial deposits and spring deposits associated with past or modern ground-water discharge in Ash Meadows, Pahrump Valley, and Furnace Creek Wash. Such deposits are typically considered nonmagnetic. To help determine the source of these aeromagnetic anomalies, we conducted ground-magnetic studies at five areas: near Death Valley Junction, at Point of Rocks Spring, at Devils Hole, at Fairbanks Spring, and near Travertine Springs. Depth-to-source calculations show that the sources of these anomalies lie within the Tertiary and Quaternary sedimentary section. We conclude that they are caused by discrete volcanic units lying above the pre-Tertiary basement. At Death Valley Junction and Travertine Springs, these concealed volcanic units are probably part of the Miocene Death Valley volcanic field exposed in the nearby Greenwater Range and Black Mountains. The linear nature of the aeromagnetic anomalies suggests that these concealed volcanic rocks are bounded and offset by near-surface faults.
英文关键词	Magnetic surveys Radioactive waste disposal Volcanism Igneous rocks Geology Geophysical surveys High resolution California Nevada Magnetic anomalies Amargosa Desert Aeromagnetic surveys Ground-magnetic studies Crustal lithologies
出版年	2005
语种	英语
国家	United States
URL	http://r.cnki.net/KCMS/detail/detail.aspx?DbCode=KJBG&dbname=KJBGW&filename=59fb2db131c97d1d54a00d8d
来源机构	United States Geological Survey
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/273318
推荐引用方式 GB/T 7714	Blakely, R. J,Hillhouse, J. W,Morin, R. L.. Ground-Magnetic Studies of the Amargosa Desert Region, California and Nevada.,2005.