Geology topics
M. F. Kane
Publications and source records attributed to M. F. Kane.
Gravity observations and Bouguer anomaly values for northern Maine
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Geophysical study of Cenozoic geologic structures of northern Owens Valley, California
A narrow gravity minimum anomaly of amplitude 30 mgals indicates that northern Owens Valley , California , a narrow fault-bounded trough or graben filled with Cenozoic clastic deposits to a depth of as much as 8,000 ft. Seismic-refraction measurements support this conclusion. Aeromagnetic and gravity measurements define a small, dense, and magnetic body buried by the valley fill of northern Owens Valley .
Aeromagnetic and gravity studies of theprecambrian in northeastern New Mexico
A contour map of the Precambrian surface for a part of northeastern New Mexico has been prepared from aeromagnetic , gravity , and drill-hole data. The area extends approximately from the Colorado border south to latitude34° N., and from the foothills of the Sangre de Cristo Mountains east to longitude 104° W. Thirty-seven depths to Precambrian rocks were computed from aeromagnetic anomalies. Regional gravityanomalies were generally not suitable for quantitative analysis, but the gravity highs correlated with known areas ofbasement highs, providing a basis for contouring in areas of meager depth control. Drill-hole data provided 61depths to basement in and near the survey area. The contouring along the east edge of the Sangre de Cristo Mountainswas guided by exposures of Precambrian rocks. A principal feature of the contour map is the Sierre Grande Arch, a basement highland that trends southwestacross the area to the northwest part of Guadalupe County. Major depressions are outlined west of Vegas Junction, northeast of Santa Rosa, and north and northeast of Las Vegas. The largest of these, the Las Vegas basin, occupiesmore than 1,000 square miles and may be more than 10,000 ft deep Copyright.
Geophysical study of subsurface structure in southern Owens Valley, California
Gravity and seismic measurements in southern Owens Valley , California , have outlined a deep subsurface trough, bounded throughout the greater part of its length by steep faults. Depths to the bedrock floor along the central part of the valley range from 3,000 to 9,000 ft below the surface. The subsurface trough is divided into two parts, a narrow channel-like depression near Lone Pine bounded by northwest-trending faults, and a broad basin at Owens Lake bounded by a more complex series of border faults. The bedrock ridge that crops out to form Alabama Hills is shown to extend from Independence to the north edge of Owens Lake, nearly twice its visible extent. The main direction of faults that have formed the valley is northwest; subsidiary faults trend north, northeast, and east. A fairly sharp velocity boundary within the Cenozoic valley deposits suggests a change in the rate and character of deposition which was probably the result of renewed uplift in the nearby mountains.
Preliminary interpretation of gravity data in west-central Maine
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Geophysical investigation of Mono Basin, California
Gravity and seismic studies in Mono Basin , Mono County, California , completed during the summer of 1957 revealed a large, roughly triangular block that had subsided about 18,000 ± 5000 feet and received an accumulation of about 300 ± 100 cubic miles of light clastic sediments and volcanic material of Cenozoic age. The seemingly near-vertical faults that bound this great block are displaced toward the center of the basin from the surrounding mountain masses, but in general they are parallel to well-defined Basin and Range trends. The gravity minimum anomaly associated with the Mono Basin structure has a residual gravity relief of about 50 mgals, and the lowest gravity readings (on Paoha Island) yield a complete Bouguer gravity value of about - 260 mgals with respect to the International Ellipsoid. The computed depth of subsidence is based on a density of 2.3 gms/ cm 3 for the basin fill and 2.7 gms/cm 3 for the basement rocks. Seismic-refraction profiles at several places in the basin demonstrate that the Cenozoic deposits are thick where the gravity is low and relatively thin where the gravity is higher. Along common seismic and gravity profiles steep seismic dips coincide with steep gravity gradients. Numerous seismic reflections are present within the basin fill. Anomalies on four aeromagnetic profiles are related in part to volcanic material within the Cenozoic section. It is concluded that Mono Basin may be a volcano-tectonic depression caused by subsidence along faults, following extrusion of magma from a magma chamber at depth. Volcanic rocks of Pliocene(?) and Pleistocene ages are exceptionally abundant in this area.
Geologic effects of the Rainier underground nuclear explosion : a summary progress report of U.S. Geological Survey investigations
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