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Basement Structure in Northwest Peninsular Florida
Neil M. Coleman (1), Mark T. Stewart (2)
Results of a recently completed gravity investigation suggest that basement offsets produced by normal faulting are the sources of observed gravity and magnetic anomalies in northwest peninsular Florida (Lafayette, Dixie, Gilchrist, and Levy Counties). A series of parallel fault-block basins and uplifts are proposed as the dominant basement structures. These structures and the Southwest Georgia Embayment developed in response to the same regional stress field in early Mesozoic time.
Two-hundred and sixteen gravity stations are established and correlated with the International Gravity Standardization Net. Bouguer anomaly values are derived for each station and regional gravity components are analyzed using trend surface analyses. Geologic cross/sections are presented based on available stratigraphic information, and the gravity effect for each section is calculated using the method of polygons. Basement structural interpretations were iteratively adjusted within geologic constraints until close agreement was achieved between calculated and observed gravity profiles.
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