Seismic stratigraphy of the western Florida carbonate platform above the Mid-Cretaceous sequence boundary (MCSB)

Conference · Mon Mar 01 04:00:00 EST 1993 · Geological Society of America, Abstracts with Programs; (United States)

OSTI ID:6078630

Jee, J L ^[1]

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1. Univ. of Florida, Gainesville, FL (United States). Dept. of Geology

From the Apalachicola Basin (AB) to the Sarasota Arch, a web of multifold seismic and 29 wells were analyzed to determine Upper Cretaceous-Cenozoic stratigraphy. Concordant reflection geometries above and below the MCSB throughout most of the study area do not suggest prolonged subaerial exposure of the platform as some have considered. The configuration of the MCSB surface influenced the distribution of overlying sediment such that the section is thick in the basins and thin on the highs. The three main units recognized are Upper Cretaceous, Paleocene-Eocene, and post-Eocene. The Upper Cretaceous has two subunits, KU1 and KU2. KU1 corresponds in age to the Tuscaloosa-Eutaw lithostratigraphic units, has continuous, parallel seismic facies, and tends to thicken in depressions on the MCSB. KU2 is age-equivalent to part of the Selma Gp. Maastrichtian strata are locally thin to partly absent. In the AB, KU2 appears intensely faulted. Sonic velocities in KU2 show southeastward change to more carbonate rock across the Middle Ground Arch, where hummocky-to-contorted seismic facies and thickening on the structural high suggest constructional accumulation. In wells, Paleocene strata lie unconformably on the Upper Cretaceous. The Paleocene section is thin and not easy to resolve on seismic sections. In the AB, the lowermost Eocene sequence is a wedge that thickens dramatically to the west. In the eastern AB, younger Eocene sequences are stacked to form broad en echelon mounds. Post-Eocene strata in the AB are continuous, parallel and drape the upper Eocene surface. Along the southeastern, up-dip margin of the Tampa Embayment (TE), a belt of west-prograding clinoforms marks the Eocene shelf edge. Landward of this, a seismic marbled zone suggests dolomitic facies. In the post-Eocene section of the TE, Oligocene-Lower Miocene strata form successive sequences of progradational clinoforms that steepen as they impinge on the FL Escarpment.

• OSTI ID: 6078630
• Report Number(s): CONF-9304188--
• Conference Information: Journal Name: Geological Society of America, Abstracts with Programs; (United States) Journal Volume: 25:4
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
CARBONATE ROCKS
CENOZOIC ERA
DEVELOPED COUNTRIES
DIMENSIONS
FLORIDA
GEOLOGIC AGES
GEOLOGIC FORMATIONS
GEOLOGIC STRATA
GEOLOGIC STRUCTURES
GEOLOGY
GEOPHYSICAL SURVEYS
LITHOLOGY
MESOZOIC ERA
NORTH AMERICA
PETROLOGY
ROCKS
SEDIMENTARY ROCKS
SEISMIC SURVEYS
STRATIGRAPHY
SURVEYS
THICKNESS
USA