Knowledge Resource Center for Ecological Environment in Arid Area
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. |
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