Krämer, Tom; Schornick, James C (2023): Thorium isotopes measurements inside internal layers of manganese deposits from the South Pacific Ocean [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.954696
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Abstract:
The ratio of 230 Thorium excess over 232 Thorium isotopes has been determined for different layered deposit zones inside ferromanganese nodules and crusts retrieved in the South Pacific Ocean during various R/V Eltanin cruises. Samples were prepared from the nodules and crusts by peeling or scraping successive layers and measuring the resultant decrease in thickness with calipers. The samples were then ground to a fine powder and split into two aliquots, one for U and Th isotopic analysis, the other for elemental analysis. The Thorium was extracted using Thenoyltrifluoroacetone (TTA) and measured using Alpha-particle spectroscopy.
Related to:
Krämer, Tom; Schornick, James C (1974): Comparison of elemental accumulation rates between ferromanganese deposits and sediments in the South Pacific Ocean. Chemical Geology, 13(3), 187-196, https://doi.org/10.1016/0009-2541(74)90019-9
Krämer, Tom; Schornick, James C (2023): Chemical composition of the internal layers of manganese deposits from the South Pacific Ocean. PANGAEA, https://doi.org/10.1594/PANGAEA.954698
Source:
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
Further details:
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
Project(s):
Coverage:
Median Latitude: -46.470833 * Median Longitude: -98.075000 * South-bound Latitude: -59.033330 * West-bound Longitude: -134.300000 * North-bound Latitude: -33.050000 * East-bound Longitude: -67.300000
Date/Time Start: 1962-10-01T00:00:00 * Date/Time End: 1966-01-01T00:00:00
Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 0.03 m
Event(s):
ELT05.004SS-RD * Latitude: -59.033330 * Longitude: -67.300000 * Date/Time: 1962-10-01T00:00:00 * Elevation: -3475.0 m * Location: South Pacific Ocean * Campaign: ELT05 * Basis: Eltanin * Method/Device: Dredge, rock (DRG_R) * Comment: Institute: ARFFSU
ELT15.013-PC * Latitude: -57.833000 * Longitude: -108.650000 * Date/Time: 1964-01-01T00:00:00 * Elevation: -4589.0 m * Recovery: 4 m * Location: Southern Ocean * Campaign: ELT15 * Basis: Eltanin * Method/Device: Piston corer (PC)
ELT21.004-BT * Latitude: -33.050000 * Longitude: -82.050000 * Date/Time: 1965-01-01T00:00:00 * Elevation: -3877.0 m * Location: Southern Ocean * Campaign: ELT21 * Basis: Eltanin * Method/Device: Trawl net (TRAWL)
Comment:
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 T1, p. 189 of the related publication.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Krämer, Tom | |||
| 2 | Latitude of event | Latitude | Krämer, Tom | |||
| 3 | Longitude of event | Longitude | Krämer, Tom | |||
| 4 | Elevation of event | Elevation | m | Krämer, Tom | ||
| 5 | Identification | ID | Krämer, Tom | |||
| 6 | Deposit type | Deposit type | Krämer, Tom | |||
| 7 | DEPTH, sediment/rock | Depth sed | m | Krämer, Tom | Geocode | |
| 8 | Distance | Dist | mm | Krämer, Tom | from outer layer/surface | |
| 9 | Distance, minimum | Dist min | mm | Krämer, Tom | from outer layer/surface | |
| 10 | Distance, maximum | Dist max | mm | Krämer, Tom | from outer layer/surface | |
| 11 | Thorium-230 excess/Thorium-232 activity ratio | (230Th xs/232Th) | Krämer, Tom | Alpha-particle spectroscopy | unit given as "(dphpg)" in the publication | |
| 12 | Thorium-230 excess/Thorium-232 activity ratio, standard deviation | (230Th xs/232Th) std dev | ± | Krämer, Tom | Alpha-particle spectroscopy |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
147 data points