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Crew
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Robert Embley
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Chief Scientist, NOAA, Newport
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John Trefry
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Chief Scientist, Florida Institute Of Technology
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Randy Koski
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Chief Scientist, USGS Western Region
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Hank Chezar
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Chief Scientist, USGS Western Region
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Equipment Used
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underwatercamera
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underwatertelevision
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CTDmeter
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Purpose
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time-series investigations of hydrothermal vents
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and mineral deposits at Cleft and CoAxial segments
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Summary
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Eight successful camera tows, 20 successful submersible
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dives (2775-2794). Approximately 150 hours of video tape, 8000 still
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photographs, and 40 sulfide samples. The camera tows revealed 5 new
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vent sites south of the Plume site on southern Cleft segment.
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Notes
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A194WF -- (modified from 7/22/94 USGS Bulletin)
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Randy Koski and Hank Chezar are back from a successful 24 day cruise to the
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southern Juan de Fuca Ridge aboard the ATLANTIS II. Twenty dives with
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submersible ALVIN DSV investigated and sampled recent lava flows, diffuse low
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temperature hydrothermal venteng, high low temperature hydrothermal venting
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(to 342dC), sulfide chimneys and mounds, and vent biology on the Cleft
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and CoAxial segments of the ridge. Night operations during the cruise included
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CTD casts and tows and camera and survery with the USGS camera system.
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Eight camera tows yielded 32 hours of video plus 35-mm pictures of the sea
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floor. At least 7 new vent sites on the southernmost Juan de Fuca Ridge and
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in the East Blanco Depression (on the Blanca Fracture Zone) were observed on
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the deep tow video tape. The cruise provided an opportunity to revisit sites
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of hydrothermal activity and mineral deposition on southern Juan de Fuca Ridge
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that were discovered during USGS-sponsored ALVIN dives in 1984. This year's
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cruise was funded by the NOAA/PMEL (Newport and Seattle), NSF, Florida
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Institute of Technology, University of Florida, University of Washington and
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the USGS.
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Got Help?
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For A-1-94-WF, we would appreciate any information on -- contract, days at sea, dive count, funding, information specialist, information to be derived, kms of navigation, NGDC Info, owner, ports, project number, publications, scanned materials, seismic description, station count, station description, submersible, tabulated info.
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