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Summary Information for Field Activity 1989-029-FA

Area of Operations: Blake Plateau, United States, North America, North Atlantic

Dates: October 05, 1989 to October 15, 1989

Chief scientist: Frank Manheim
Pete Popenoe

Objectives: 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.

Type of Activity:

Information to be derived:

Summary: 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.

Contact: Frank Manheim (fmanheim@usgs.gov)
Pete Popenoe (ppopenoe@usgs.gov)

InfoBank: uses the identifier N-1-89-EC. Visit this site for more information.

Related Links:

Platform Info:
NR-1 SUNBIRD

Publications resulting from these data

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: p. 43-94

Data Types and Locations:

 

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