Field Activity 1984-015-FA

Identifier 1984-015-FA
Alternate names L9-84-CP, L984CP
Purpose Study the distribution and composition of ferromanganese-oxide crusts in the Marshall Islands area and retrieve a current meter/sediment trap mooring deployed on Horizon Guyot, Mid-Pacific Mountains, in October 1983 on the USGS L5-83-HW cruise (FA 83012).
Location Marshall Islands to Hawaii, Horizon Guyot, Mid-Pacific Mountains, United States, North Pacific;
Summary Physical data holdings at PCMSC Seismic data (12 kHz and 3.5 kHz): 5410 km; Airgun (80 cu in and 148 cu in): 730 km; Dredge hauls: 13; Box cores: 2; Gravity cores: 8; Recovered current meter from Horizon Guyot.
Info derived Sea floor map; Samples and chemical analysis;
Comments Original Center People field contained: Bill Schwab - Ch. Sci., Tim Ling - geologist. Project = Marine Metallogenesis, Marine Metallogenesis
Samuel Phillips Lee
USNS S. P. Lee (T-AGS-31), Length 208 feet, Beam 39 feet, Draft 14 feet, Speed 12 knots
Start Majuro, Radak Chain, Marshall Islands 1984-07-28
End Honolulu, HI 1984-08-16
Days in the field 20
West -193
East -157
North 19.37
South 7.25


384 Woods Hole Road
Quissett Campus
Woods Hole, MA02543-1598
(508) 548-8700
Principal investigators William C Schwab
Crew members
William C Schwab
Scientist, Staff
Information specialist(s)
Matthew Arsenault
Specialist, Information
Affiliate staff USGS-Menlo Park: Kevin O'Toole - mechanical technician, Paul Wenberg - mechanical technician, James Vaughan - electronic technician, Rick Viall - electronic technician, Joe Stagg - Geologist, Alice Davis - geologist, Leda Beth Pickthorn - geologist, Joanne Thede - geologist, Chris Wilson - Chief Navigator/Data Curator, Robin Bouse - Navigator, Wendy Bohrson - Navigator, Kaye Kinoshita - watchstander; Bob Weldin - Geologist, Bureau of Mines; Robert Rowland - geologist, USGS-Reston; Henry Meyer - geologist, Purdue University; Janet Haggerty - geologist, University of Tulsa)

Data types and categories

Data category: Electro-Magnetic, Imagery, Location-Elevation, Sampling, Seismics
Data type: Gravity, Magnetics, Photo, Navigation, Geology, Air Gun / Water Gun

Documents: Notes and log books

Name Description
Cruise report Chief Scientist's report including cruise narrative, personnel list, station operations, chemical analyses of crusts, and trackmap.

Equipment used

Equipment Usage description Data types Datasets
Single channel hydrophone Air Gun / Water Gun, Boomer, Bubble Gun, Sparker, Sub Bottom Profiler 1
Magnetometer (wh) Magnetics 1
Gravity meter (wh) Gravity 1
Integrated Navigation System Navigation (no data reported)
Box corer Biology, Geology (no data reported)
Gravity corer Geology (no data reported)
Camera- deep sea Photo (no data reported)
Dead reckoning Navigation (no data reported)
Dredge Biology, Geology 1
Air gun Air Gun / Water Gun (no data reported)


Datasets produced in this activity

Dataset name Equipment Description Dataset contact
1984-015-FA-SE-001 Single channel hydrophone microfilm of Nancy K. Soderberg
NGDC MGD77 data Magnetometer (wh) Linda P McCarthy
NGDC MGD77 data Gravity meter (wh) Linda P McCarthy
Sorbed-water (H2O-) corrected chemistry for ferromanganese crust samples from the western equatorial Pacific Ocean Dredge Ferromanganese crust samples were collected via dredge during four oceanographic research cruises to the western equatorial Pacific Ocean. The location (latitude, longitude, depth) and concentrations of 27 major and trace elements in the most recent growth layers of ferromanganese crusts from 57 dredge sites are presented here, as well as select seawater chemistry at each location. These data were used in statistical analyses to determine how oceanographic conditions affect the chemical composition of ferromanganese crusts throughout the region. The changes in ferromanganese crust composition show that modern measurements of these primary oceanographic parameters, as well as paleoceanographic reconstructions, can be used to define regions of interest for FeMn crust exploration. Kira Mizell


Samples collected during this field activity