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):
Deep Sea Drilling Project (DSDP)
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):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Lalou, Claude | DSDP/ODP/IODP sample designation | ||
| 3 | Sample code/label 2 | Sample label 2 | Lalou, Claude | |||
| 4 | Uranium-238 | 238U | mg/kg | Lalou, Claude | ||
| 5 | Uranium-238, standard deviation | 238U std dev | ± | Lalou, Claude | ||
| 6 | Thorium-232 | 232Th | mg/kg | Lalou, Claude | ||
| 7 | Thorium-232, standard deviation | 232Th std dev | ± | Lalou, Claude | ||
| 8 | Uranium-234/Uranium-238 activity ratio | (234U/238U) | Lalou, Claude | |||
| 9 | Uranium-234/Uranium-238 activity ratio, standard deviation | (234U/238U) std dev | ± | Lalou, Claude | ||
| 10 | Uranium-234/Uranium-238 activity ratio | (234U/238U) | Lalou, Claude | corrected for a 300000 yr decrease of 234U excess | ||
| 11 | Calcium carbonate | CaCO3 | % | Lalou, Claude |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
139 data points
Data
| 1 Event | 2 Sample label | 3 Sample label 2 | 4 238U [mg/kg] | 5 238U std dev [±] | 6 232Th [mg/kg] | 7 232Th std dev [±] | 8 (234U/238U) | 9 (234U/238U) std dev [±] | 10 (234U/238U) (corrected for a 300000 yr dec...) | 11 CaCO3 [%] |
|---|---|---|---|---|---|---|---|---|---|---|
| 54-424 | D | 54-424-2-5,80-81 | 3.62 | 0.28 | 2.33 | 0.32 | 1.233 | 0.080 | 1.539 | 58 |
| 54-424 | E | 54-424-2-6,98-99 | 5.77 | 0.54 | 3.38 | 0.42 | 1.250 | 0.100 | 1.578 | 76 |
| 54-424 | F | 54-424-3-2,71-72 | 6.13 | 0.46 | 3.97 | 0.48 | 1.180 | 0.075 | 1.416 | 69 |
| 54-424 | O | 54-424-3-3,113-114 | 10.78 | 0.61 | 5.17 | 0.68 | 1.177 | 0.075 | 1.409 | 82 |
| 54-424 | P | 54-424-3-6,85-86 | 14.94 | 0.75 | 4.23 | 0.65 | 1.106 | 0.062 | 1.245 | 83 |
| 54-424 | M | 54-424-4-4,90-91 | 46.00 | 2.00 | 7.50 | 1.20 | 1.028 | 0.042 | 1.065 | 89 |
| 54-424 | N | 54-424-4-5,130-131 | 207.00 | 7.00 | 9.00 | 1.50 | 1.066 | 0.021 | 1.152 | 89 |
| 54-424A | epsilon | 54-424A-2-2,125-127 | 61.30 | 1.60 | 6.50 | 0.60 | 1.089 | 0.021 | 1.208 | 88 |
| 54-424A | H | 54-424A-2-3,109-110 | 344.00 | 17.00 | 11.00 | 1.40 | 1.010 | 0.016 | 1.023 | 95 |
| 54-424A | K | 54-424A-3-1,139-140 | 33.00 | 1.70 | 8.00 | 1.00 | 1.135 | 0.057 | 1.312 | 92 |
| 54-424A | L | 54-424A-3-3,101-102 | 43.00 | 2.00 | 10.90 | 1.70 | 1.121 | 0.051 | 1.280 | 94 |
| 54-424B | C | 54-424B-3-5,20-21 | 35.60 | 1.90 | 3.70 | 1.10 | 1.037 | 0.024 | 1.086 | 79 |
| 54-424B | G | 54-424B-4-1,95-96 | 510.00 | 27.00 | 5.00 | 1.00 | 0.989 | 0.070 | 88 | |
| 54-424B | I | 54-424B-4-3,80-81 | 196.00 | 9.00 | 8.00 | 2.00 | 1.160 | 0.029 | 1.370 | 93 |