PANGAEA_948515 Analytical results on palagonite samples and manganese crusts from the Mid-Atlantic Ridge McGoldrick, Peter J; Keays, Reid R; Scott, Bob B Analytical results on palagonite samples and manganese crusts from the Mid-Atlantic Ridge 2022-09-20 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.948515 Investigator Peter J McGoldrick Earth Science Event label Latitude of event Longitude of event Elevation of event Identification Rock type Sample type Aluminium oxide Iron oxide, FeO Manganese oxide Magnesium oxide Potassium oxide Thallium Rubidium Caesium Sulfur Cobalt Chromium geoscientificInformation AK20-T0-75-1A AKU20 Dredge Dredge, chain bag Geochemistry manganese micronodule manganese nodule ocean Sediment T0-75-1A T3-71D 148-2B T3-72-17 T4-73-2A3 T4-73-6 TAG1971 TAG1971-2B TAG1972 TAG1972-17 TAG1973 TAG1973-2A TAG1973-6A Atomic absorption spectrophotometry Flame photometry Radiochemical neutron activation analysis (RNAA) Leco Automatic Sulfur titrator Akademik Kurchatov Discoverer (1966) Complete 26.045 26.7416666667 -44.79 -25.35 NOAA-MMS NOAA and MMS Marine Minerals Geochemical Database unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International 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 121 data points text/tab-separated-values McGoldrick, Peter J; Keays, Reid R; Scott, Bob B (1979): Thallium: a sensitive indicator of rock/seawater interaction and of sulfur saturation of silicate melts. Geochimica et Cosmochimica Acta, 43(8), 1303-1311, https://doi.org/10.1016/0016-7037(79)90120-0 McGoldrick, Peter J; Keays, Reid R; Scott, Bob B (2022): Analytical results on basalt samples from the Mid-Atlantic Ridge [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.948513 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

A suite of three palagonites from pillowed basalts collected from within the Mid-Atlantic Ridge rift valley between 25°N and 30°N wer analysed along with another suite of two hydrothermally altered basaltic breccias and four hydrothermal manganese crusts collected from the TAG hydrothermal field at 26°N on the Mid-Atlantic Ridge. These specimen were collected during Trans-Atlantic Geotraverse (TAG) NOAA cruises using the R/V Discoverer. Two more hydrogenous ferromanganese crusts wer also analysed. They were collected from the eastern extension of the Atlantis Fracture Zone aboard the R/V Kurchatov in 1975. Radiochemical neutron activation analysis has been used to determine Tl, Rb. Cs. Co and Cr. Iron, Mn, and Mg concentrations in the crystalline samples and Mn crusts have been determined by AAS. K was determined by flame photometry, and S in these samples (as well as five glasses) has been determined with a Leco Automatic Sulfur titrator. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.948515"! ** 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 1 - Part 2 - pp. 1306-1307 of the related publication.

https://doi.org/10.1016/0016-7037(79)90120-0 Thallium: a sensitive indicator of rock/seawater interaction and of sulfur saturation of silicate melts 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://doi.pangaea.de/10.1594/PANGAEA.948513 Analytical results on basalt samples from the Mid-Atlantic Ridge https://en.wikipedia.org/wiki/NOAAS_Discoverer_(R_102) Discoverer (1966) https://en.wikipedia.org/wiki/Thallium Thallium https://wiki.pangaea.de/wiki/NOAA-MMS NOAA-MMS DIF 9.4 2022-09-20 2026-04-02