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Summary for Field Activity Number 1977-005-FA

Alternate Leg ID: 77-02; 77-5

Area of Operations: Rio de la Plata Canyon, Puerto Rico, United States, North America, North Atlantic

Dates: February 14, 1977 to February 16, 1977

Objectives: Investigate submarine canyon off Rio de la Plata, north coast of Puerto Rico: coring, seismics, and bathymetry.

Type of Activity: Seismic profiling
Piston coring

Information to be derived: Morphology

Summary: Ewing piston cores: 12; 3.5 kHz: 40 km. Cores obtained from canyon flanks and axis on shelf and slope. Flanks mostly clay with pelagic organisms but many terrigenous sand beds throughout penetration of 20 feet. Semi-indurated probably Tertiary clay and bent pipe in axial attempts. Seismic quality poor but inter-canyon sediments clearly unconformable on apparently smooth surface near axial depth of canyon. 3.5 kHz good for selecting coring locations. Bathymetry and seismics to be compiled/interpreted in San Juan. Cores stored in San Juan. Core cuts to be analyzed at Duke.

USGS Project Number: PR CO-OP

Contact: Jim Trumbull ()

Map for Area of Operations :

Map of field activity boundary.

Platform Info:
photo of EASTWARD
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