Chemical composition of oxide-phosphorite pavement from the Blake Plateau under various preparation treatment

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.

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.From 1983 until 1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions. At the time it was the most extended data compilation on ferromanganese deposits world wide. Initially published in a proprietary format incompatible with present day standards it was jointly decided by AWI and NOAA to transcribe this legacy data into PANGAEA. This transfer is augmented by a careful checking of the original sources when available and the encoding of ancillary information (sample description, method of analysis...) not present in the NOAA-MMS database.

Supplement to: Commeau, J A; Manheim, Frank T (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

Identifier
DOI https://doi.org/10.1594/PANGAEA.854202
PID https://hdl.handle.net/10013/epic.46138.d083
Related Identifier https://doi.org/10.7289/V52Z13FT
Related Identifier https://doi.org/10.7289/V53X84KN
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.854202
Provenance
Creator Commeau, J A; Manheim, Frank T ORCID logo
Publisher PANGAEA
Publication Year 1982
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Language English
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 128 data points
Discipline Earth System Research
Spatial Coverage (-78.993W, 30.715S, -77.370E, 32.308N); Blake Plateau, Atlantic Ocean
Temporal Coverage Begin 1982-09-19T00:00:00Z
Temporal Coverage End 1982-09-26T00:00:00Z