Cyclicity in Upper Mississippian Bangor Limestone, Blount County, Alabama
Conference
·
OSTI ID:6921291
The Upper Mississippian (Chesterian) Bangor Limestone in Alabama consists of a thick, complex sequence of carbonate platform deposits. A continuous core through the Bangor on Blount Mountain in north-central Alabama provides the opportunity to analyze the unit for cyclicity and to identify controls on vertical facies sequence. Lithologies from the core represent four general environments of deposition: (1) subwave-base, open marine, (2) shoal, (3) lagoon, and (4) peritidal. Analysis of the vertical sequence of lithologies in the core indicates the presence of eight large-scale cycles dominated by subtidal deposits, but defined on the basis of peritidal caps. These large-scale cycles can be subdivided into 16 small-scale cycles that may be entirely subtidal but illustrate upward shallowing followed by rapid deepening. Large-scale cycles range from 33 to 136 ft thick, averaging 68 ft; small-scale cycles range from 5 to 80 ft thick and average 34 ft. Small-scale cycles have an average duration of approximately 125,000 years, which is compatible with Milankovitch periodicity. The large-scale cycles have an average duration of approximately 250,000 years, which may simply reflect variations in amplitude of sea level fluctuation or the influence of tectonic subsidence along the southeastern margin of the North American craton.
- OSTI ID:
- 6921291
- Report Number(s):
- CONF-880301-
- Country of Publication:
- United States
- Language:
- English
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·
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Related Subjects
02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
ALABAMA
CARBONATE ROCKS
EXPLORATION
FEDERAL REGION IV
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGY
GEOPHYSICS
LIMESTONE
MINERAL RESOURCES
MISSISSIPPIAN PERIOD
MOUNTAINS
NATURAL GAS DEPOSITS
NORTH AMERICA
PALEOZOIC ERA
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STRATIGRAPHY
TECTONICS
USA
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
ALABAMA
CARBONATE ROCKS
EXPLORATION
FEDERAL REGION IV
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGY
GEOPHYSICS
LIMESTONE
MINERAL RESOURCES
MISSISSIPPIAN PERIOD
MOUNTAINS
NATURAL GAS DEPOSITS
NORTH AMERICA
PALEOZOIC ERA
PETROLEUM DEPOSITS
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SEDIMENTATION
STRATIGRAPHY
TECTONICS
USA