Other ID: UGEO Leg 6; CORPUS 21
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Location: 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;
Principal Investigator(s): Martin F. Kane
Data Type(s): Electro-Magnetic: Gravity, Electro-Magnetic: Magnetics, Location-Elevation: Navigation, Seismics: Sonobouy, Seismics: Sparker, Seismics: Sub Bottom Profiler
Scientific Purpose/Goals: 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.
Start Date: 1971-11-24
Start Port/Location: Monrovia, Liberia
End Date: 1971-12-10
End Port/Location: Charlotte Amalie, St. Thomas, U.S. Virgin Islands
Equipment Used: 3.5 kHz, Sparker system, LaCoste-Romberg gravimeter G-179, Varian V-75 magnetometer, Seismic refraction, ITT 4007 satellite navigation, Decca radar system, Single channel hydrophone
Information to be Derived: Suspended sediment concentrations; Bathymetric maps; Magnetic intensity and gravity; Sub-bottom acoustic reflection profiles;
Summary of Activity and Data Gathered: 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.
Staff: Frank W. Jennings, Martin F. Kane, Charles J. O'Hara, James M. Robb
Notes: Original Center People field contained: Martin F. Kane (Chief Sci.), Jim Robb (Geologist), Chuck O'Hara (Geologist), Frank W. Jennings (Electronic Technician).
Kane, M.F., 1972, Acoustic reflection profiles, Transatlantic crossing west, International Decade of Ocean Exploration, Leg 6, 1971 cruise, UNITEDGEO I: USGS-GD-72-007, PB-209-872, 21 p. URL: http://www.ntis.gov/search/product.aspx?ABBR=PB209872.