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- W180100036 abstract "Three detailed gravity profiles across parts of the Uyaijah ring structure have been completed using an average station spacing of 260 M (giving a total of 217 gravity stations) and level surveys for elevation control. When combined with regional gravity-anomaly data, the profiles are adequate for construction of a structural model of the ring complex based on gravity models. The resulting structural model, based on profile fits to gravity responses of three-dimensional models and excess-mass calculations, gives a depth estimate to the base of the complex of 4.75 km. The contacts of the complex are inferred to be steeply dipping inward along the southwest margin of the structure. To the north and east, however, the basal contact of the complex dips more gently inward (about 30 degrees). The ring structure appears to be composed of three laccolith-shaped plutons; two are granitic in composition and make up about 85 percent of the volume of the complex, and one is granodioritic and comprises the remaining 15 percent. The source area for the plutons appears to be in the southwest quadrant of the Uyaijah ring structure. A northwest-trending shear zone cuts the northern half of the structure and contains mafic dikes that have a small but identifiable gravity-anomaly response. The structural model agrees with models derived from geological interpretation except that the estimated depth to which the structure extends is decreased considerably by the gravity results." @default.
- W180100036 created "2016-06-24" @default.
- W180100036 creator A5040587578 @default.
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- W180100036 date "1987-01-01" @default.
- W180100036 modified "2023-09-26" @default.
- W180100036 title "Gravity profiles across the Uyaijah Ring structure, Kingdom of Saudi Arabia" @default.
- W180100036 doi "https://doi.org/10.3133/ofr87500" @default.
- W180100036 hasPublicationYear "1987" @default.
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