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Gravity interpretation of Frenchman Flat and vicinity, Nevada Test Site

1986; United States Department of the Interior; Linguagem: Inglês

10.3133/ofr86211

2332-4899

C.H. Miller, D.L. Healey,

Geological Modeling and Analysis

This report presents the results and the interpretation of a gravity survey in Frenchman Flat and vicinity, Nevada Test Site. About 950 gravity stations were set in an area of approximately 300 sq mi. The gravity observations were made at points of known horizontal and vertical position; the least accurate of these components is about 250 ft and 5 ft, respectively. The gravity values were referenced to a station with known absolute value and reduced to a sea level datum. A combined free-air and Bouguer elevation factor of 0.06 mGal/ft, which corresponds to a density of 2.67 gm/cc, was applied and the standard corrections for latitude and terrain were made. The gravity data were summarized as a complete Bouguer map and the broad geologic features associated with the complete Bouguer anomalies were interpreted and also summarized in map form. The interpretation was done with density contrasts of 0.7 gm/cc in the eastern and southern parts of the area and 0.3 gm/cc in the western altered and intruded area. The alteration and intrusion in the western area appears to have increased the density of Cenozoic rocks.