time-series investigations of hydrothermal vents and mineral deposits at Cleft and CoAxial segments
Description
United States Geological Survey, Menlo Park, California. Chief Scientists: Bob Embley, John Trefry, Randy Koski, Hank Chezar. Geological data (underwatercamera, underwatertelevision, CTDmeter) of field activity A-1-94-WF in southern and central Juan de Fuca Ridge from 06/16/1994 to 07/09/1994
Location
southern and central Juan de Fuca Ridge
Summary
Eight successful camera tows, 20 successful submersible dives (2775-2794). Approximately 150 hours of video tape, 8000 still photographs, and 40 sulfide samples. The camera tows revealed 5 new vent sites south of the Plume site on southern Cleft segment.
Comments
A194WF -- (modified from 7/22/94 USGS Bulletin) Randy Koski and Hank Chezar are back from a successful 24 day cruise to the southern Juan de Fuca Ridge aboard the ATLANTIS II. Twenty dives with submersible ALVIN DSV investigated and sampled recent lava flows, diffuse low temperature hydrothermal venteng, high low temperature hydrothermal venting (to 342dC), sulfide chimneys and mounds, and vent biology on the Cleft and CoAxial segments of the ridge. Night operations during the cruise included CTD casts and tows and camera and survery with the USGS camera system. Eight camera tows yielded 32 hours of video plus 35-mm pictures of the sea floor. At least 7 new vent sites on the southernmost Juan de Fuca Ridge and in the East Blanco Depression (on the Blanca Fracture Zone) were observed on the deep tow video tape. The cruise provided an opportunity to revisit sites of hydrothermal activity and mineral deposition on southern Juan de Fuca Ridge that were discovered during USGS-sponsored ALVIN dives in 1984. This years cruise was funded by the NOAA/PMEL (Newport and Seattle), NSF, Florida Institute of Technology, University of Florida, University of Washington and the USGS.
Staff information imported from InfoBank
Bob Embley (NOAA, Newport) - Chief Scientist
John Trefry (Florida Institute Of Technology) - Chief Scientist
Randy Koski (USGS Western Region) - Chief Scientist
Hank Chezar (USGS Western Region) - Chief Scientist
