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The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 34 (1984), Pages 237-245

The Internal Framework of the Southwestern Florida Bank

F. Jeanne Shaub (1)

ABSTRACT

The University of Texas Institute for Geophysics has collected 550 nautical miles (nm) (1018 km) of multichannel reflection seismic Previous HitdataNext Hit from the western half of the southern Florida Bank. The Previous HitdataTop indicates that the structural framework underlying this area consists of several elements. Along the north, the Pinellas County Arch is a basement feature oriented NE-SW and overlain by a relatively thin carbonate sedimentary section that thickens into the Tampa Embayment to the northwest and the South Florida Basin to the southeast. The western margin of the bank is underlain by the Sheffield Arch, a basement feature trending NW-SE and flanked by the Florida Escarpment on the west and the South Florida Basin sedimentary section to the east. It is most likely a southeastward continuation of the Pinellas County Arch. The southern terminus of the Sheffield Arch is overlain by a structure interpreted as a buried Tertiary shelf margin, possibly a reef, within the present bank. Within the South Florida Basin sedimentary section, there are two secondary basins trending approximately NE-SW. They probably originated in Jurassic/Early Cretaceous (?) time and were continuously reactivated into the Tertiary. There is in addition, an off-bank seismic facies between the southern end of the Sheffield Arch and the Tortugas Bank. This feature is interpreted as a Jurassic(?)-Tertiary reentrant into the southern Florida Bank. Finally, the present southern shelf break is underlain by a series of prograding clinoforms estimated to be late Tertiary-Quaternary in age.


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