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Lalou, Claude; Brichet, Evelyne (1980): (Table 1) Uranium and Thorium concentrations, activity ratios and calcium carbonate content of DSDP Site 54-424 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.770353, Supplement to: Lalou, C; Brichet, E (1980): Anomalously high uranium contents in the sediment under Galapagos hydrothermal mounds. Nature, 284(5753), 251-253, https://doi.org/10.1038/284251a0

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Abstract:
The geochemical behaviour of uranium and thorium in metalliferous sediments and hydrothermal deposits has been widely studied and the main results have been summarised by Boström and Rydell. These isotopes may be used to clarify how the metal-rich solutions are introduced into sediment cover and seawater. Using radiochemistry followed by alpha spectrometry, we have measured uranium concentrations as high as several hundred p.p.m., which must clearly be associated with ocean ridge thermal activity, in sediments interbedded between the basaltic basement and the green hydrothermal mud at DSDP Site 424. These high uranium concentrations indicate the path followed by the hydrothermal fluid which, debouching at the sediment–water interface, formed the green mud.
Project(s):
Coverage:
Median Latitude: 0.593200 * Median Longitude: -86.130267 * South-bound Latitude: 0.588800 * West-bound Longitude: -86.130300 * North-bound Latitude: 0.597000 * East-bound Longitude: -86.130200
Date/Time Start: 1977-05-23T00:00:00 * Date/Time End: 1977-05-23T00:00:00
Minimum Elevation: -2708.0 m * Maximum Elevation: -2685.0 m
Event(s):
54-424 * Latitude: 0.593800 * Longitude: -86.130300 * Date/Time: 1977-05-23T00:00:00 * Elevation: -2685.0 m * Penetration: 76 m * Recovery: 36.4 m * Location: North Pacific/MOUND * Campaign: Leg54 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 7 cores; 66.5 m cored; 9.5 m drilled; 54.8 % recovery
54-424A * Latitude: 0.588800 * Longitude: -86.130200 * Date/Time: 1977-05-23T00:00:00 * Elevation: -2708.0 m * Penetration: 34 m * Recovery: 13.8 m * Location: North Pacific/MOUND * Campaign: Leg54 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 4 cores; 34 m cored; 0 m drilled; 40.5 % recovery
54-424B * Latitude: 0.597000 * Longitude: -86.130300 * Date/Time: 1977-05-23T00:00:00 * Elevation: -2705.0 m * Penetration: 46.5 m * Recovery: 30.3 m * Location: North Pacific/MOUND * Campaign: Leg54 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 46.5 m cored; 0 m drilled; 65.1 % recovery
Comment:
The uncetrainties are one standard deviation (1 sigma) derived from the counting statistics.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Sample code/labelSample labelLalou, ClaudeDSDP/ODP/IODP sample designation
3Sample code/label 2Sample label 2Lalou, Claude
4Uranium-238238Umg/kgLalou, Claude
5Uranium-238, standard deviation238U std dev±Lalou, Claude
6Thorium-232232Thmg/kgLalou, Claude
7Thorium-232, standard deviation232Th std dev±Lalou, Claude
8Uranium-234/Uranium-238 activity ratio(234U/238U)Lalou, Claude
9Uranium-234/Uranium-238 activity ratio, standard deviation(234U/238U) std dev±Lalou, Claude
10Uranium-234/Uranium-238 activity ratio(234U/238U)Lalou, Claudecorrected for a 300000 yr decrease of 234U excess
11Calcium carbonateCaCO3%Lalou, Claude
Size:
139 data points

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