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Commeau, J A; Manheim, Frank T (1982): Chemical composition of oxide-phosphorite pavement from the Blake Plateau under various preparation treatment. PANGAEA, https://doi.org/10.1594/PANGAEA.854202, Supplement to: Commeau, JA; Manheim, FT (1982): Testing the variation of Fe-Mn concentration as a function of preparation treatment for phosphate-manganese nodules from the Blake Plateau. (Expedition GYRE 82-11), Cruise Note. USGS Woods Hole Coastal and Marine Science Center

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Abstract:
Sample preparation technique is critical for valid chemical analyses. A main source of error comes from the fact that the great specific surface area of crusts or nodules enhances their tendency to retain or attract hygroscopic moisture. Variable treatment of this moisture can in extreme cases lead to analytical value differences as great as 40-50 %. In order to quantify these influences, samples of ferromanganese oxide-phosphorite pavement from the Blake Plateau have been subjected to various drying techniques before analysis using X-ray fluorescence.
Source data set:
Grant, John Bruce; Moore, Carla J; Alameddin, George; Chen, Kuiying; Barton, Mark (1992): The NOAA and MMS Marine Minerals Geochemical Database. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V52Z13FT
Further details:
Log sheet (preliminary information) of sample drying, GYRE82-11 Expedition (1982). USGS Woods Hole Coastal and Marine Science Center, hdl:10013/epic.46138.d083
Warnken, Robin R; Virden, William T; Moore, Carla J (1992): The NOAA and MMS Marine Minerals Bibliography. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V53X84KN
Coverage:
Median Latitude: 31.392916 * Median Longitude: -78.162008 * South-bound Latitude: 30.714830 * West-bound Longitude: -78.993000 * North-bound Latitude: 32.308330 * East-bound Longitude: -77.370000
Date/Time Start: 1982-09-19T00:00:00 * Date/Time End: 1982-09-26T00:00:00
Minimum Elevation: -952.0 m * Maximum Elevation: -549.0 m
Event(s):
GYRE82-11-C06 (C6-Sta3) * Latitude: 32.198330 * Longitude: -77.731660 * Date/Time: 1982-09-20T00:00:00 * Elevation: -549.0 m * Location: Blake Plateau, Atlantic Ocean * Campaign: GYRE82-11 (82034 G-11-82-SE) * Basis: Gyre * Method/Device: Gravity corer (GC) * Comment: Institute: USGSWH
GYRE82-11-C09 (C9-Sta14) * Latitude: 31.925000 * Longitude: -77.611670 * Date/Time: 1982-09-23T00:00:00 * Elevation: -719.0 m * Location: Blake Plateau, Atlantic Ocean * Campaign: GYRE82-11 (82034 G-11-82-SE) * Basis: Gyre * Method/Device: Gravity corer (GC) * Comment: Institute: USGSWH
GYRE82-11-D01 (D1-Sta2A) * Latitude: 32.308330 * Longitude: -77.683330 * Date/Time: 1982-09-19T00:00:00 * Elevation: -550.0 m * Location: Blake Plateau, Atlantic Ocean * Campaign: GYRE82-11 (82034 G-11-82-SE) * Basis: Gyre * Method/Device: Dredge, rock (DRG_R) * Comment: Institute: USGSWH
Comment:
Samples were ground to powder in their natural hygroscopic moisture before being treated. The Mn, FE and Ca concentrations are given after ignition at 1000°C.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventCommeau, J A
2Date/Time of eventDate/TimeCommeau, J A
3Elevation of eventElevationmCommeau, J A
4Latitude of eventLatitudeCommeau, J A
5Longitude of eventLongitudeCommeau, J A
6Sample IDSample IDCommeau, J A
7ManganeseMn%Commeau, J AX-ray fluorescence (XRF)
8IronFe%Commeau, J AX-ray fluorescence (XRF)
9CalciumCa%Commeau, J AX-ray fluorescence (XRF)
10Loss on dryingLOD%Commeau, J AOven-dry, heated at 110°C overnight
11Loss on dryingLOD%Commeau, J AHeated at 500°C for one hour
12Loss on ignitionLOI%Commeau, J AIgnited at 1000°C for one hour
13DescriptionDescriptionCommeau, J Aof composite samples
Size:
128 data points

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