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The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 19 (1969), Pages 266-266

Abstract: A Gravity Survey of Florida Bay and the Lower Keys

Mahlon M. Ball, Woodson R. Oglesby

ABSTRACT

A Bouger gravity map of the southern portion of Florida, including stations ranging from about 24° to 26° North Latitude, and 80° West Longitude is presented.

the salient features depicted are: 1) The western rim of the South Florida Basin, with gravity values increasing toward the Basin's center. 2) A large Previous HitminimumNext Hit anomaly centered near Homestead in Dade County. 3) An elongate gravity Previous HitminimumNext Hit extending from the area of Barnes Sound southwestward over most of Florida Bay. 4) A Previous HitminimumNext Hit indicated by two gravity readings obtained in the Marquesas Keys, suggesting a need for further investigation.

Examination of cuttings and cores recovered from oil tests drilled on or near the Previous HitminimumNext Hit anomalies indicates that if salt is present, it is deep-seated (below 11,000 feet). Wells near Homestead reveal the area is structurally high, when contoured on rocks ranging from Eocene to Lower Cretaceous age. The preponderance of anhydrite, dolomite, and dense aphanitic limestone in more than 4000-feet of Lower Cretaceous rocks penetrated in the area suggest the average density of this section may exceed that of the underlying basement rock. If this is so, a Previous HitminimumTop anomaly would occur over an uplifted or topographically high area of the basement.

End_of_Record - Last_Page 266-------

ACKNOWLEDGMENTS AND ASSOCIATED FOOTNOTES

Institute of Marine Sciences, University of Miami, Miami, Florida

Bureau of Geology, Department of Natural Resources, Tallahassee, Florida

Copyright © 1999 by The Gulf Coast Association of Geological Societies