|Nevada Isostatic Residual Gravity Over Basement
|This study of gravity data from Nevada is part of a statewide analysis of mineral
resources. The main objective of the gravity study were: 1) to infer the structure
and composition of the basement; 2) to determine the thickness of Cenozoic deposits.
An iterative procedure based on the gravity data, a knowledge of the surface geology,
and an estimate of the density of Cenozoic deposits was used to separate the isostatic
residual gravity field into two component parts, a "basement" component and a "cover
thickness" component. The former component contains information about the basement
whereas the latter yields an estimate of the thickness of Cenozoic deposits. All computations
were performed with a rectangular grid having intersections spaced at 2 km. The results
are presented as contours on two maps at a scale of 1:1,000,000. Sheet 1 represents
the basement gravity and sheet 2 represents the inferred thickness of Cenozoic cover.
For complete details see Open File Report 90-404.