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USGS Coastal and Marine Geology Program

Field Activity Details for field activity A194WF

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AKA: none

Other ID: A-1-94-WF,AII_131-16,131-16-AII

Status: Completed

Organization(s): USGS, Pacific Coastal and Marine Science Center

Funding Program(s): Hydrothermal Systems Project (MU145)

Principal Investigator(s): Henry Chezar, Randy Koski

Affiliate Investigator(s): Bob Embley (NOAA, Newport),John Trefry (Florida Institute Of Technology)

Information Specialist(s):

Data Type(s): Environmental Data: CTD, Imagery: Photo, Imagery: Video, Sampling: Geology

Scientific Purpose/Goals: time-series investigations of hydrothermal vents and mineral deposits at Cleft and CoAxial segments

Vehicle(s):

Start Port/Location:

End Port/Location:

Start Date: 1994-06-16

End Date: 1994-07-09

Equipment Used: CTD, underwatertelevision, samples

Information to be Derived:

Summary of Activity and Data Gathered: 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.

Staff:

Affiliate Staff:

Notes: 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

Location:

southern and central Juan de Fuca Ridge

Boundaries
North: 50.75 South: 42 West: -135 East: -122.25

Platform(s):

photo of Alvin
Alvin
photo of Atlantis II
Atlantis II

Publications

Portals/Viewers

Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
CTD --- Surveys (geochemical)
Experiments (geochemical)
CTD
underwatertelevision --- Video
samples --- Biology
Chemistry
Geology
ALV2775 (chimney sample in holdings)

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