Other ID: none
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Location: Shelf margin edge off lower Florida Keys, Florida, Gulf of Mexico, United States, North America, North Atlantic;
Principal Investigator(s): Eugene A. Shinn
Affiliate Investigator(s): Dr. Albert C. Hine, USF
Data Type(s): Sonar: Sidescan, Seismics: Boomer, Seismics: Sparker, Sonar: Single Beam, Biological Field Study: Experiments, Visual Identification: Ground Truthing, Location-Elevation: Navigation
Scientific Purpose/Goals: To determine: if there are strategraphic sequences seaward of the Florida Keys reef tract that would indicate the occurrence of previous (Pleistocene) sea-level stands (preliminary perusal of data suggests there are); if this bank margin has features similar to other windward carbonate margins of the Bahamas, i.e., is there offbank/downslope sand export opposite a well-developed section of the shallow reef; if there are relatively sediment-starved sections along the upper slope where gaps occur in the shallow reef; if there is a sedimentalogic response along the upper slope to gaps in the Florida Key island tract; the dominant sediment type and rate of sediment accumulation along the upper slope; the existence of submarine cementation along the upper slope in response to the activity of the Florida current; the extent of downslope sediment movement by mass transfer mechanisms or by sediment gravity flows; the existence of gullies/small canyons within the upper 200 m of water depth; and the size, morphology, and extent of multiple, seaward reef tracts.
Start Date: 1990-07-28
Start Port/Location: St. Petersburg, FL
End Date: 1990-08-04
End Port/Location: St. Petersburg, FL
Equipment Used: Sidescan sonar, EG&G Model 260 sidescan sonar, ORE GeoPulse, Sparker system, Echosounder, Corer - slow, Mooring tripod, Loran-C
Information to be Derived:
Summary of Activity and Data Gathered: Approximately 525 km of seismic profiles, 81 km of 300-m sidescan, and 22 km of 600-m sidescan sonar profiles were acquired, and 31 Shipek surface sediment samples were taken along 4 transects. These data supplement the 500 km of high-resolution seismic profiles obtained in the same area in July 1989.
Staff: Eugene A. Shinn, Barbara H. Lidz