USGS Coastal and Marine Geology Program

Coastal & Marine Geology Program

Field Activity Details for field activity 1989-029-FA

Other ID: none

Status: Completed

Organization(s): USGS, Woods Hole Coastal and Marine Science Center

Funding Program(s):

Location: Blake Plateau, United States, North America, North Atlantic;

Principal Investigator(s): Frank T. Manheim, Peter Popenoe

Affiliate Investigator(s):

Information Specialist(s):

Data Type(s): Environmental Data: CTD, Environmental Data: Current, Environmental Data: Temperature, Imagery: Photo, Imagery: Video, Location-Elevation: Navigation, Sampling: Biology, Sampling: Geology, Seismics: Sub Bottom Profiler, Visual Identification: Submersible Observations

Scientific Purpose/Goals: To study the deep scour pits on the northern Blake Plateau to determine the nature of erosion or solution, the age and nature of the outcropping rocks, the nature of the biomass supporting large fish concentrations reported in this area, the thickness of the phosphorite-manganese pavements over the Blake Plateau, and the fracture patterns and their orientation; to visit the "Aluminaut Hole" and measure the water salinity within erosional pits to determine possible presence of fresh water nodules and their occurence; to determine if pavement is discontinuous; to examine and groundcheck features seen on GLORIA long-range sidescan sonar mosaic; to measure current velocity, temperature and direction throughout the area to determine the extent south-flowing undercurrents have contributed to scour topography; and to study the deepwater ahermatypic reef mounds.

Vehicle(s):

Start Date: 1989-10-05

Start Port/Location: Norfolk, VA

End Date: 1989-10-15

End Port/Location: Norfolk, VA

Equipment Used: Video camera - deep sea, Benthos model 372 camera and strobe, 70-mm camera, 3.5 kHz, Grab sampler, Temperature and salinity, Savonius rotor current meter, Dead reckoning, Submersible Observation

Information to be Derived:

Summary of Activity and Data Gathered: Sediment samplers were not placed into operating position due to heavy seas (must be emplaced by divers). Approximately 70 nautical miles (140 km) were traversed in view of the bottom. Approximately 35 nm of the bottom were recorded on video tape. Approximately 50 nm were recorded with sidescan sonar. Approximately 360 photographs of the bottom were made with hand-held cameras; 633 photos were taken with the external Benthos camera system.

Staff:

Affiliate Staff:

Notes: Project = EEZ Minerals, EEZ Minerals

Location Map:

Platform(s):

photo of NR-1
NR-1
photo of Sunbird
Sunbird

Publications

Popenoe, P., and Manheim, F.T., 2001, Origin and history of the Charleston Bump--geological formations, currents, bottom conditions, and their relationship to Wreckfish habitats on the Blake Plateau, in Sedberry, G.R., ed., Island in the Stream--Oceanography and Fisheries of the Charleston Bump: American Fisheries Society Symposium, v. 25.

Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Video camera - deep sea --- Video
Benthos model 372 camera and strobe --- Photo
70-mm camera --- Photo
3.5 kHz --- Sub Bottom Profiler
Grab sampler --- Biology
Geology
Temperature and salinity --- CTD
Temperature
Savonius rotor current meter --- Current
Dead reckoning --- Navigation
Submersible Observation --- Submersible Observations
1989-029-FA-NL-001 ( Chief Scientist's cruise report describing ship movement, personnel, equipment and data acquisition notes, daily narrative, dive logs, seafloor geology, trackmaps, etc.)