Magnetic investigations

Technical Report · Sat Dec 31 00:00:00 EST 1983

DOI:https://doi.org/10.2172/137614· OSTI ID:137614

Bath, G. D.; Jahren, C. E.; Rosenbaum, J. G. ^[1]; Baldwin, M. J. ^[2]

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1. Geological Survey, Denver, CO (USA)
2. Fenix and Scisson, Inc., Mercury, NV (USA)

Air and ground magnetic anomalies in the Climax stock area of the NTS help define the gross configuration of the stock and detailed configuration of magnetized rocks at the Boundary and Tippinip faults that border the stock. Magnetizations of geologic units were evaluated by measurements of magnetic properties of drill core, minimum estimates of magnetizations from ground magnetic anomalies for near surface rocks, and comparisons of measured anomalies with anomalies computed by a three-dimensional forward program. Alluvial deposits and most sedimentary rocks are nonmagnetic, but drill core measurements reveal large and irregular changes in magnetization for some quartzites and marbles. The magnetizations of quartz monzonite and granodiorite near the stock surface are weak, about 0.15 A/m, and increase at a rate of 0.00196 A/m/m to 1.55 A/m, at depths greater than 700 m (2300 ft). The volcanic rocks of the area are weakly magnetized. Aeromagnetic anomalies 850 m (2800 ft) above the stock are explained by a model consisting of five vertical prisms. Prisms 1, 2, and 3 represent the near surface outline of the stock, prism 4 is one of the models developed by Whitehill (1973), and prism 5 is modified from the model developed by Allingham and Zietz (1962). Most of the anomaly comes from unsampled and strongly-magnetized deep sources that could be either granite or metamorphosed sedimentary rocks. 48 refs., 23 figs., 3 tabs.

• Research Organization: US Geological Survey, Denver, CO (United States)
• DOE Contract Number: AI08-76DP00474
• OSTI ID: 137614
• Report Number(s): USGS-OFR-83-377; ON: TI90003446
• Resource Relation: Other Information: PBD: 1983; Related Information: Is Part Of Geologic and geophysical investigations of Climax stock intrusive, Nevada; PB: 82 p.
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
99 MATHEMATICS
COMPUTERS
INFORMATION SCIENCE
MANAGEMENT
LAW
MISCELLANEOUS
MAGNETIC SURVEYS
MAPPING
YUCCA MOUNTAIN
SITE CHARACTERIZATION
GEOLOGIC SURVEYS
MEASURING METHODS
VOLCANIC ROCKS
GEOLOGIC FAULTS
AERIAL SURVEYING
PROBABILISTIC ESTIMATION
MAGNETIC PROPERTIES
ROCK MECHANICS
QUARTZITES
MARBLE
GRANODIORITES
QUARTZ MONZONITE
MATHEMATICAL MODELS
COMPILED DATA
Yucca Mountain Project