Growth rates and possible age of a North Pacific manganese nodule


The rate of accumulation of a ferromanganese coating on a fragment of pillow basalt was estimated using a variety of techniques. Unsupported 230 Th activity decrease in the oxide layer, K/A dating of the basalt, fission tracks dating of the glassy layer around the basalt, thickness of the palagonitization rind, and integrated 230 Th activity give ages from approximately 3 x 10-6 years to 5 x 10-3 years. Data suggest that the ferromanganese material formed rapidly (33 mm/10-6 years) and by hydrothermal or volcanic processes.

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1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions.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 propriatory 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.

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Metadata Access
Creator Lalou, Claude; Brichet, Evelyne; Poupeau, G; Romary, P; Jehanno, Celestine
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 1979
Rights Creative Commons Attribution 3.0 Unported;
OpenAccess true
Language English
Resource Type Dataset
Format text/tab-separated-values
Size 228 data points
Discipline Earth System Research
Spatial Coverage (-105.177 LON, 9.259 LAT); Pacific Ocean