You, Chen-Feng; Bickle, Michael J (1998): (Table 1) U and Th isotope analyses of pyrite and anhydrite of ODP Site 158-957 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.769877, Supplement to: You, C-F; Bickle, MJ (1998): Evolution of an active sea-floor massive sulphide deposit. Nature, 394(6694), 668-671, https://doi.org/10.1038/29279
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Abstract:
Hydrothermal circulation at oceanic spreading ridges causes sea water to penetrate to depths of 2 to 3 km in the oceanic crust where it is heated to ~400 °C before venting at spectacular 'black smokers'. These hydrothermal systems exert a strong influence on ocean chemistry (Edmond et al., 1979, doi:10.1016/0012-821X(79)90061-X), yet their structure, longevity and magnitude remain largely unresolved (Elderfield and Schultz., 1996, doi:10.1146/annurev.earth.24.1.191). The active Transatlantic Geotraverse (TAG) deposit, at 26° N on the Mid-Atlantic Ridge, is one of the largest, oldest and most intensively studied of the massive sulphide mounds that accumulate beneath black-smoker fields. Here we report ages of sulphides and anhydrites from the recently drilled (Humphris et al., 1995, doi:10.1038/377713a0) TAG substrate structures -determined from 234U-230Th systematics analysed by thermal ionization mass spectrometry. The new precise ages combined with existing data (Lalou et al., 1993, doi:10.1029/92JB01898; 1998, doi:10.2973/odp.proc.sr.158.214.1998) show that the oldest material (11,000 to 37,000 years old) forms a layer across the centre of the deposit with younger material (2,300–7,800 years old) both above and below. This stratigraphy confirms that much of the sulphide and anhydrite are precipitated within the mound by mixing of entrained sea water with hydrothermal fluid (James and Elderfield, 1996, doi:10.1130/0091-7613(1996)024<1147:COOFFA>2.3.CO;2). The age distribution is consistent with episodic activity of the hydrothermal system recurring at intervals of up to 2,000 years.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 26.137029 * Median Longitude: -44.826100 * South-bound Latitude: 26.136600 * West-bound Longitude: -44.826400 * North-bound Latitude: 26.137200 * East-bound Longitude: -44.825800
Date/Time Start: 1994-10-10T10:00:00 * Date/Time End: 1994-11-10T10:30:00
Minimum Elevation: -3655.0 m * Maximum Elevation: -3548.0 m
Event(s):
158-957C * Latitude: 26.137200 * Longitude: -44.825800 * Date/Time Start: 1994-10-10T10:00:00 * Date/Time End: 1994-10-14T12:45:00 * Elevation: -3548.0 m * Penetration: 49.2 m * Recovery: 21.69 m * Location: South Atlantic Ocean * Campaign: Leg158 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 49.2 m cored; 0 m drilled; 44.1 % recovery
158-957E * Latitude: 26.137000 * Longitude: -44.826100 * Date/Time Start: 1994-10-15T22:30:00 * Date/Time End: 1994-10-27T21:45:00 * Elevation: -3646.0 m * Penetration: 125.7 m * Recovery: 4.03 m * Location: South Atlantic Ocean * Campaign: Leg158 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 18 cores; 94.2 m cored; 0 m drilled; 4.3 % recovery
158-957G * Latitude: 26.137000 * Longitude: -44.825800 * Date/Time Start: 1994-10-21T07:00:00 * Date/Time End: 1994-10-22T07:00:00 * Elevation: -3646.0 m * Penetration: 25 m * Recovery: 1.12 m * Location: South Atlantic Ocean * Campaign: Leg158 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 3 cores; 13 m cored; 0 m drilled; 8.6 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | You, Chen-Feng | DSDP/ODP/IODP sample designation | ||
| 3 | Mineral name | Mineral | You, Chen-Feng | |||
| 4 | Uranium | U | mg/kg | You, Chen-Feng | Thermal Ionization Mass Spectrometry (TIMS) | |
| 5 | Uranium, error, relative | U e rel | % | You, Chen-Feng | Thermal Ionization Mass Spectrometry (TIMS) | |
| 6 | Thorium | Th | mg/kg | You, Chen-Feng | Thermal Ionization Mass Spectrometry (TIMS) | |
| 7 | Thorium, error, relative | Th e rel | % | You, Chen-Feng | Thermal Ionization Mass Spectrometry (TIMS) | |
| 8 | Uranium-234/Uranium-238 activity ratio | (234U/238U) | You, Chen-Feng | Thermal Ionization Mass Spectrometry (TIMS) | ||
| 9 | Uranium-234/Uranium-238 activity ratio, error, relative | (234U/238U) e rel | % | You, Chen-Feng | Thermal Ionization Mass Spectrometry (TIMS) | |
| 10 | Uranium-234/Uranium-238 activity ratio | (234U/238U) | You, Chen-Feng | Thermal Ionization Mass Spectrometry (TIMS) | initial | |
| 11 | Thorium-230/Uranium-238 ratio | 230Th/238U | You, Chen-Feng | Thermal Ionization Mass Spectrometry (TIMS) | atomic | |
| 12 | Thorium-230/Uranium-238, error, relative | 230Th/238U e rel | % | You, Chen-Feng | Thermal Ionization Mass Spectrometry (TIMS) | |
| 13 | Thorium-230/Uranium-238 activity ratio | (230Th/238U) | You, Chen-Feng | Thermal Ionization Mass Spectrometry (TIMS) | ||
| 14 | Thorium-230/Uranium-238 activity ratio, error, relative | (230Th/238U) e rel | % | You, Chen-Feng | Thermal Ionization Mass Spectrometry (TIMS) | |
| 15 | Age, dated | Age dated | ka | You, Chen-Feng | Age, 234U/230Th Uranium-Thorium | |
| 16 | Age, dated standard deviation | Age dated std dev | ± | You, Chen-Feng | Age, 234U/230Th Uranium-Thorium |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
359 data points