Bahamian Pleistocene model for some Mississippian oolites
- Univ. of Akron, OH (USA)
San Salvador Island, unlike most Bahamian islands, is a narrow isolated platform surrounded by deep ocean. Therefore, sedimentary deposits on San Salvador must be explained in terms of processes and settings on this narrow, isolated shelf. Pleistocene oolite occurs between Illinoian and Wisconsinan paleosols. Dune ridges of up to 120 ft are composed of Pleistocene cross-bedded oolitic grainstone, whereas interdunal deposits are bioclastic packstone and wackestone containing abundant Chione cancellata. In lower dunal deposits, bioclastic content increases and the degree of sorting decreases. A fenestral porosity zone occurs approximately 5 ft above present-day sea level. In several ridges, oolite drapes over older paleosol-capped bioclastic ridges. During the Sangamonian, sea water flooded the platform, however some remnant Aftonian ridges remained above sea level. As cold water from the surrounding deep ocean warmed on the shelf, ooids were generated and were washed onto beaches and blown into dunes. Remnant ridges restricted water movement and acted as nucleii for eolian ooid dunes. As sea level continued to rise, ooids were replaced by lagoonal bioclastic deposits. Ooid production was restricted to the swash zone along beaches resulting in the mixture of ooids and bioclastic sand in later Sangamonian deposits. Numerous Mississippian oolites display features similar to the Pleistocene oolite of San Salvador Island. Possible comparisons include thick lenses of Ste. Genevieve and Bangor limestones, paleosols in the Ste. Genevieve halo-shaped bodies of Greenbrier oolite, and the relationship of nearly all olites with bioclastic facies.
- OSTI ID:
- 5461233
- Report Number(s):
- CONF-8909166-; CODEN: AABUD
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (USA), Vol. 73:8; Conference: American Association of Petroleum Geologists (AAPG) eastern section meeting, Blommington, IN (USA), 10-13 Sep 1989; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
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BAHAMA ISLANDS
CARBONATE ROCKS
DEPOSITION
COMPARATIVE EVALUATIONS
GEOLOGIC FORMATIONS
GEOLOGIC MODELS
MISSISSIPPIAN PERIOD
QUATERNARY PERIOD
RESERVOIR ROCK
SEAWATER
CENOZOIC ERA
DEVELOPING COUNTRIES
GEOLOGIC AGES
HYDROGEN COMPOUNDS
ISLANDS
OXYGEN COMPOUNDS
ROCKS
SEDIMENTARY ROCKS
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020200* - Petroleum- Reserves
Geology
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