Accumation rates of manganese in manganese nodules using differential 230Th-231Pa activities


The manganese content of 7 manganese nodules was determined by neutron activation. The decrease of unsupported 231Pa and 230Th in the outer few tenths of millimeters was used to evaluate Mn accumulation. Because CaCO3 is a Mn-free diluent, the Mn concentration results and the nodules accumulation rate results are given on a carbonate-free basis. Nodule densities were assumed to be 2.5 g/cm³. The Mn accumulation rates are calculated per unit cross sectional area of the nodule rather than per unit surface area.

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1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions.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.This dataset represents the digitized Table 2 - Part 1, pp. 145 of the related publication.

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Metadata Access
Creator Bender, Michael L; Ku, Teh-Lung; Broecker, Wallace S ORCID logo
Publisher PANGAEA
Publication Year 2022
Rights Creative Commons Attribution 4.0 International;
OpenAccess true
Language English
Resource Type Dataset
Format text/tab-separated-values
Size 32 data points
Discipline Earth System Research
Spatial Coverage (-24.683W, -55.000S, 62.600E, 34.900N); Southern Ocean; Atlantic Ocean; Indian Ocean; Pacific Ocean
Temporal Coverage Begin 1959-11-27T00:00:00Z
Temporal Coverage End 1965-09-23T00:00:00Z