PANGAEA_880613 Annotated record of the detailed examination of Mn deposits uncovered at the Mohole Experiment Site I, Pacific Ocean Murata, K J; Erd, R C Annotated record of the detailed examination of Mn deposits uncovered at the Mohole Experiment Site I, Pacific Ocean 1964 PANGAEA Dataset Supplement to: Murata, K J; Erd, R C (1964): Composition of sediments from the experimental Mohole Project (Guadalupe Site). Journal of Sedimentary Research, 34(3), 633-655, https://doi.org/10.1306/74D7110E-2B21-11D7-8648000102C1865D https://doi.pangaea.de/10.1594/PANGAEA.880613 Investigator K J Murata Earth Science Sample ID Date/Time of event Latitude of event Longitude of event Elevation of event DEPTH, sediment/rock Position Deposit type Quantity of deposit Sediment type Comment Description geoscientificInformation Gravity corer MOHO-1 MOHOLE_phase-1 Sampling/drilling 1961-03-01 1961-03-01 Complete 28.98333 28.98333 -117.5 -117.5 0.0 m (DEPTH, sediment/rock) 0.0 m (DEPTH, sediment/rock) NOAA-MMS NOAA and MMS Marine Minerals Geochemical Database unrestricted CC-BY-3.0: Creative Commons Attribution 3.0 Unported English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 7 data points text/tab-separated-values Grant, John Bruce; Moore, Carla J; Alameddin, George; Chen, Kuiying; Barton, Mark (1992): The NOAA and MMS Marine Minerals Geochemical Database. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V52Z13FT Warnken, Robin R; Virden, William T; Moore, Carla J (1992): The NOAA and MMS Marine Minerals Bibliography. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V53X84KN

Based on chemical, spectrographic and X-ray analyses, 34 samples from the experimental Mohole consist of variable proportions of calcite (0-60 percent), biogenic opal (0-50 percent), and normal lithogenous matter (14-97 percent) with an average of 20, 32, and 48 percent, respectively. Contamination with trachytic ash, rhyolitic ash, and saponite and dolomite occurring as alteration products of basaltic material affects the composition of a few samples. Magnesium, manganese, and phosphorus seem to have been derived from basaltic material also. The amounts of barium in the samples seems to be inversely related to sedimentation rates. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.880613"! ** 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.

https://doi.org/10.1306/74D7110E-2B21-11D7-8648000102C1865D Composition of sediments from the experimental Mohole Project (Guadalupe Site) https://doi.org/10.7289/V52Z13FT The NOAA and MMS Marine Minerals Geochemical Database https://doi.org/10.7289/V53X84KN The NOAA and MMS Marine Minerals Bibliography https://en.wikipedia.org/wiki/Project_Mohole MOHOLE_phase-1 https://wiki.pangaea.de/wiki/NOAA-MMS NOAA-MMS DIF 9.4 2026-04-30