10.1594/PANGAEA.864229Halbach, PeterPeterHalbachPANGAEA1975Event labelLatitude of eventLongitude of eventElevation of eventSample IDDEPTH, sediment/rockPositionDeposit typeQuantity of depositSizeShapeSubstrate typeDescriptionUniform resource locator/link to imageNOAA and MMS Marine Minerals Geochemical Database (NOAA-MMS)Supplementary Dataset10.17741/bgsf/48.1-2.00410.7289/V52Z13FT10.7289/V53X84KN37 data pointstext/tab-separated-valuesCreative Commons Attribution 3.0 UnportedThe limnic ferromanganese ore concretions in some Finnish lakes are described. Their chemical and mineral compositions have been measured as have their natural surroundings — the latter by means of physico-chemical in-situ analysis. The sources of the nodules' contents are discussed, and a theory based on the calculated precipitation fields of the important ore minerals is presented for the ore formation.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1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions.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: Halbach, Peter (1976): Mineralogical and geochemical investigations on Finnish lake ores. Bulletin of the Geological Society of Finland, 48(1-2), 33-4225.170426.962.2377163.966571Finland