Chemical composition of carbonate-free fraction of sediments from the East Pacific Rise


The expedition "RISEPAC" in 1961 of Scripps Institution of Oceanography crossed the East Pacific Rise at about 12-14°S between 90° and 140 °W, securing heat flow measurements and sediment samples. The sediments are predominantly dark brown clayey sediments at deeper parts of the traverse, gradually becoming lighter brown to almost brownish white on the rise due to increase in carbonate content. On the very crest of the rise where the heat flow reaches a maximum, the sediments are very dark brown with lower carbonate content although well above the compensation depth. To avoid fortuitous results a thick layer from each core was sampled, usually the interval 30-70 cm. Before analysis the samples were dried at 60 °C and ground and further leached with 0.2-molar acetic acid at 50°C for 1 h in order to separate the carbonate free fraction which was then analysed using wet chemistry methods.

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1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions.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 3, pp. 432-433 of the related publication.

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Metadata Access
Creator Boström, Kurt; Peterson, Melvin N A
Publisher PANGAEA
Publication Year 2022
Rights Creative Commons Attribution 4.0 International;
OpenAccess true
Resource Type Dataset
Format text/tab-separated-values
Size 389 data points
Discipline Earth System Research
Spatial Coverage (-139.575W, -14.683S, -90.500E, -12.500N); Pacific Ocean
Temporal Coverage Begin 1961-12-05T00:00:00Z
Temporal Coverage End 1961-12-28T00:00:00Z