PANGAEA_960335 Concentration of Th isotopes for manganese nodules at various levels of their external manganese rich layers Tsunogai, Shizuo; Nakanishi, Keita; Yamada, Masatoshi Concentration of Th isotopes for manganese nodules at various levels of their external manganese rich layers 2023-07-11 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.960335 Investigator Shizuo Tsunogai mag-hu@ees.hokudai.ac.jp Earth Science Event label LATITUDE LONGITUDE ELEVATION Identification Deposit type DEPTH, sediment/rock Sample type Distance Distance, minimum Distance, maximum Thorium-230 Thorium-230, standard deviation Thorium-232 Thorium-232, standard deviation Thorium-228 Thorium-228, standard deviation geoscientificInformation Box corer Geochemistry GH78-1 GH78-1-FG73-1 Grab growth KH-79-4 KH-79-4-22 manganese micronodule manganese nodule ocean Sediment Station 1036 Station 22 Alpha spectrometry Hakurei-Maru (1974) Hakuho-Maru 1978-01-19 1979-11-01 Complete 8.001 20.0167 158.55 176.95 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 399 data points text/tab-separated-values Tsunogai, Shizuo; Nakanishi, Keita; Yamada, Masatoshi (1982): Effect of diagenetically remobilized metals on regional difference in manganese nodules. Geochemical Journal, 16(4), 199-212, https://doi.org/10.2343/geochemj.16.199 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

The nodules used in this study were collected from two cruises in the western North Pacific by box coring (KH-79-4) and dredging (GH-78-1). After being dried at 110°C each sample extracted from the top, side and bottom of the nodule at various penetration levels were radiochemically analyzed for their Thorium isotopes contents by digesting about 100mg of a nodule sample without application of the successive separation treatment. Thorium in the solution was purified with an anion exchange resin and chemical separation techniques, and electrodeposited onto a silver disc from a hydrochloric acid and ethanol solution. The alpha activities of 228Th, 230Th and 232Th were counted with a spectrometer equipped with a surface barrier silicon detector. The chemical yield was determined by counting the 0 activity of 234Th added before the analysis. The yield ranged from 80 to 95%. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.960335"! ** 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. 206) of the related publication.

http://en.wikipedia.org/wiki/Box_corer Box corer http://en.wikipedia.org/wiki/Elevation ELEVATION http://en.wikipedia.org/wiki/ISO_6709 LATITUDE http://en.wikipedia.org/wiki/ISO_6709 LONGITUDE https://doi.org/10.2343/geochemj.16.199 Effect of diagenetically remobilized metals on regional difference in manganese nodules 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://wiki.pangaea.de/wiki/NOAA-MMS NOAA-MMS https://www.gsj.jp/en/publications/cruise-rep/cruise17.html GH78-1 https://www.jamstec.go.jp/e/about/equipment/ships/hakuhomaru.html Hakuho-Maru https://www.jodc.go.jp/JGOFS_DMO/testpage/Ships/Hakurei.htm Hakurei-Maru (1974) DIF 9.4 2023-07-11 2026-06-18