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Regional Basement Geology of Lake Michigan
O'Hara, Norbert W. (Consultant) | Kellogg, Richard L. (Consultant)
The contiguous Lac Foumier and Romaine River anorthositic alies depends on several factors, including the physical property massifs (D in Figure 2) present somewhat of a unique opportunity contrasts, the configuration of the causative masses, and (secondarily) for the study of this problem. The primary in the northeastern Grenville where anorthosite is generally source of major gravity and magnetic anomalies in the Michigan subordinate in area compared to gabbroic rocks, the aforementioned basin is lithologic variations within the basement rocks. Other massifs contain a central region of anorthositic gabbro, sources of anomalies are basement topography, depth of Moho, associated with a 60 mgal amplitude positive anomaly, surrounded deep intracrustal variations and geologic features within the overlying by considerable areas of anorthosite. In general, positive gravity anomalies elsewhere in the Grenville with anorthositic suite gabbroic and magnetic minima are found associated with felsic and metasedimentary rocks suggests that the central anorthositic gabbro grades rocks. However, these broad generalities are complicated downward into more pure gabbro and possibly ultramafic rocks.
- Geology > Rock Type (1.00)
- Geology > Structural Geology > Tectonics > Plate Tectonics > Earthquake (0.71)
- Geophysics > Gravity Surveying (1.00)
- Geophysics > Magnetic Surveying > Magnetic Acquisition > Airborne Magnetic Acquisition (0.31)
Gravity/Magnetic Maps 3 series of gravity positives is attributed to mafic plutons emplaced in the Tudor mafic metavolcanic sequence. The gravity positives lie along the western flank of an elliptically shaped gravity minimum which may be due to a granitic pluton emplaced in the more dense volcanic sequence. Several geologic models satisfying the gravity data are proposed. One thousand additional gravity stations were established at 3.2 km intervals in western New York in the vicinity of Clarendon-Linden fault. Upward continuation of the gravity data indicate the lateral density contrasts across the fault persists to a depth of at least 9.6 km.
- North America > United States > New York (0.68)
- North America > Canada > Ontario (0.58)
- Geology > Structural Geology > Tectonics > Plate Tectonics (1.00)
- Geology > Rock Type > Igneous Rock (1.00)
- Geophysics > Magnetic Surveying (1.00)
- Geophysics > Gravity Surveying > Gravity Acquisition (0.35)
- Europe > United Kingdom > North Sea > Central North Sea > Moray Firth > Moray Firth Basin > Block 13/29b > Blake Field > Captain Formation (0.89)
- Europe > United Kingdom > North Sea > Central North Sea > Moray Firth > Moray Firth Basin > Block 13/24 > Blake Field > Captain Formation (0.89)
Preparation of the Gravity Map of the United States
O'Hara, Norbert W. (Consultant) | Lyons, Paul L. (Lyons and Lyons)
In addition to these regularly scheduled Hawaii: 2 sheets, scale I:2.500.000. GAM Committee meetings, 2 two-day workshops were held; one in November 1977 and the other in November 1980. Administration (NOAA), the GAM Committee was able to identify Norbert W. O'Hara, Consultant; and Paul L. Lyons, From GAM Committee meeting and workshop discussions, prepared and compiled through SEG's ad hoc GAM Committee as the following map specifications were developed: part of a project jointly sponsored by SEG and the U.S. Geological Scale 1: 2,500,OOO 2.67 g/cc density correction Survey. Members of the GAM Committee were derived from Albers projection 5 ft X 5 ft station distribution various governmental agencies, industry and academia. Committee 5 mgal contour interval Digital data base goals centered on the following: (1) acquisition of all available 25 mgal color interval Terrain corrections gravity data from both the private sector and the public domain; (2) IGSN-71 standard Bouguer gravity onshore preparation of a gravity contour map of the LJ. S. and offshore; (3) GRS-67 ellipsoid Free air gravity offshore development of an accessible, regional gravity digital data base of Solicitation and Acquisition Phase was spread over a period of the U. S. and offshore; and (4) acquisition of gravity data from approximately 3 years during which over 100 letters were sent to outside the U. S. for the eventual publication of the North American industrial, governmental, and academic organizations requesting Gravity Anomaly Map.
- Government > Regional Government > North America Government > United States Government (1.00)
- Energy > Oil & Gas > Upstream (1.00)