Summary Information for Field Activity 1971-006-FA

Area of Operations: transatlantic westward crossing, Liberia, Africa, Sierra Leone Rise, Vema Fracture Zone, mid-Atlantic Ridge, JOIDES 13,26,27, Charlotte Amalie, St. Thomas, U.S. Virgin Islands, Lesser Antilles, North Atlantic

Dates: November 24, 1971 to December 10, 1971

Chief scientist: Martin F. Kane

Objectives: Objectives of this cruise were: (a) to investigate the acoustic reflection characteristics of the mid-Atlantic ridge and other oceanic structures such as the Vema fracture zone and the Sierra Leone rise; (b) to correlate data from JOIDES drill holes with sub-bottom acoustic reflection profiles in oceanic areas; and (c) to extend our knowledge of sediment distribution and thickness in the deep ocean.

Type of Activity: Sub-bottom acoustic reflection;Sub-bottom acoustic reflection

Information to be derived: Suspended sediment concentrations; Bathymetric maps; Magnetic intensity and gravity; Sub-bottom acoustic reflection profiles;

Summary: The major result so far is that various geophysical data including continuous gravity, magnetics, and seismic reflection profiles and 18 seismic refraction and wide angle reflection (sonobuoy) profiles have been successfully recorded over a number of features. Gravity and magnetics records will require computer processing to be usable. Survey lines: 1, 2, 3, 4, 5, 6, 7, and 7A.

Contact: Martin F. Kane ()

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