PANGAEA_961652 Chemical analyses of hydrothermal deposits and associated material from Transform fault 'A' on the Mid-Atlantic Ridge, FAMOUS area Hoffert, Michel; Perseil, E A; Hekinian, Roger; Choukroune, P; Needham, H D; Francheteau, Jean; Le Pichon, Xavier Chemical analyses of hydrothermal deposits and associated material from Transform fault 'A' on the Mid-Atlantic Ridge, FAMOUS area 2023-08-21 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.961652 Investigator Michel Hoffert Earth Science Event label Latitude of event Longitude of event Elevation of event Identification Sample type Silicon dioxide Aluminium oxide Iron oxide, Fe2O3 Manganous manganic oxide Magnesium oxide Calcium oxide Sodium oxide Potassium oxide Titanium(II) oxide Loss on ignition Strontium Barium Vanadium Nickel Cobalt Chromium Boron Zinc Gallium Copper Description geoscientificInformation CY-74-23-12 CY-74-26-14 CY-74-26-15 CY-74-26-16 FAMOUS_06-74 Geochemistry Grab, on Cyana [Submersible] manganese micronodule manganese nodule ocean Sediment Arc spectrometry Optical emission spectrography Wet chemistry Le Noroit 1974-07-24 1974-08-03 Complete 36.940833 36.945 -33.06700000000001 -33.061500000000024 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 270 data points text/tab-separated-values Choukroune, P; Francheteau, Jean; Le Pichon, Xavier (1978): In situ structural observations along Transform Fault A in the FAMOUS area, Mid-Atlantic Ridge. Geological Society of America Bulletin, 89(7), 1013, https://doi.org/10.1130/0016-7606(1978)89%3C1013:ISSOAT%3E2.0.CO;2 Hoffert, M; Perseil, E A; Hekinian, Roger; Choukroune, P; Needham, H D; Francheteau, Jean; Le Pichon, Xavier (1978): Hydrothermal deposits sampled by diving saucer in transform fault "A" near 37°N on the Mid-Atlantic Ridge, FAMOUS Area. Oceanologica Acta, 1(1), 699-712, https://download.pangaea.de/reference/119679/attachments/publication-5216.pdf Hoffert, Michel; Perseil, E A; Hekinian, Roger; Choukroune, P; Needham, H D; Francheteau, Jean; Le Pichon, Xavier (2023): Chemical analyses of Fe-Mn coatings separated from the margins of basaltic rocks from Transform Fault 'A' and from the the Rift Valley near 36°50'N in the Mid-Atlantic Ridge [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.961653 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

Sampled hydrothermal deposits from Transform fault 'A' on the Mid-Atlantic Ridge have been classified into two main categories according to the relative proportion of the black Fe-Mn concretions with respect to the clay-rich fraction: clay-rich hydrothermal material and black Fe-Mn concretions (nodules). These materials have been analysed for their chemical composition by arc spectrometry using an ARL quantometer were made at the University of Strasbourg. This method consists of melting the sample in a mixture of lithium tetraborate and then introducing the melt into in a glycolated solvent prior analysis. Trace elements were determined using graphite discs . Na and K were determined by emission spectrometry (precision of +- 2.0%). ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.961652"! ** 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, pp. 706 of the related publication.

http://en.wikipedia.org/wiki/Loss_on_ignition Loss on ignition https://doi.org/10.1130/0016-7606(1978)89%3C1013:ISSOAT%3E2.0.CO;2 In situ structural observations along Transform Fault A in the FAMOUS area, Mid-Atlantic Ridge https://doi.org/10.17600/74005811 FAMOUS_06-74 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.961653 Chemical analyses of Fe-Mn coatings separated from the margins of basaltic rocks from Transform Fault 'A' and from the the Rift Valley near 36°50'N in the Mid-Atlantic Ridge https://en.wikipedia.org/wiki/Calcium_oxide Calcium oxide https://en.wikipedia.org/wiki/Silicon_dioxide Silicon dioxide https://wiki.pangaea.de/wiki/NOAA-MMS NOAA-MMS DIF 9.4 2023-08-21 2026-07-15