Ozima, Minoru; Takayanagi, M; Zashu, S; Amari, Sachiko (1984): (Table 1) Helium concentration in sediments [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.770039, Supplement to: Ozima, M et al. (1984): High 3He/4He ratio in ocean sediments. Nature, 311(5985), 448-450, https://doi.org/10.1038/311448a0
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Abstract:
Two decades ago, Merrihue (1964) reported 3He/4He ratios of >10**-4 in ferromagnetic separates from a Pacific deep ocean red clay and concluded that the high ratio is due to extraterrestrial debris amounting to ~1% of the sediment. A decade later Krylov et al. (1973) compiled 3He/4He isotopic data on ocean sediments measured in the Soviet Union and observed that the 3He/4He ratio is generally higher in pelagic sediments where the sedimentation rate is lower. They suggested that the high 3He/4He ratio was attributable to extraterrestrial materials which were concentrated in slowly accumulating ocean floor. However, these important discoveries were almost completely neglected until we re-examined the problem. We have measured 39 sediments from 12 different sites, 10 sites from the western to central Pacific and two sites from the Atlantic Ocean. We find 3He/4He ratios >5 * 10**-5 for six sites, well above the values generally observed in common terrestrial materials. The very high 3He/4He ratio in the sediments is probably due to input of extraterrestrial materials. Input of stratospheric dust of <1 p.p.m., which corresponds to a fallout rate of ~2,000 tons per year, can explain the observation.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 19.390289 * Median Longitude: -174.414503 * South-bound Latitude: -2.466667 * West-bound Longitude: 148.631667 * North-bound Latitude: 32.983333 * East-bound Longitude: -64.249000
Date/Time Start: 1975-07-24T00:00:00 * Date/Time End: 1975-08-01T00:00:00
Minimum DEPTH, sediment/rock: 0.0450 m * Maximum DEPTH, sediment/rock: 10.5000 m
Event(s):
43-386 * Latitude: 31.186800 * Longitude: -64.249000 * Date/Time: 1975-07-24T00:00:00 * Elevation: -4782.0 m * Penetration: 973.8 m * Recovery: 434.3 m * Location: North Atlantic/CONT RISE * Campaign: Leg43 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 65 cores; 617.4 m cored; 9.5 m drilled; 70.3 % recovery
43-387 * Latitude: 32.320000 * Longitude: -67.666700 * Date/Time: 1975-08-01T00:00:00 * Elevation: -5117.0 m * Penetration: 794.5 m * Recovery: 177.2 m * Location: North Atlantic/CONT RISE * Campaign: Leg43 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 50 cores; 468 m cored; 0 m drilled; 37.9 % recovery
Comment:
Errors in 3He and 4He consist of 50% of the hot blank and 1 sigma in the mass spectrometry, the former being much larger than the latter.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 3 | Depth, top/min | Depth top | m | Ozima, Minoru | ||
| 4 | Depth, bottom/max | Depth bot | m | Ozima, Minoru | ||
| 5 | Sample code/label | Sample label | Ozima, Minoru | DSDP/ODP/IODP sample designation | ||
| 6 | Sample mass | Samp m | g | Ozima, Minoru | ||
| 7 | Helium-3 | 3He | 10-10 cm3/g | Ozima, Minoru | ||
| 8 | Helium-4 | 4He | 10-9 cm3/g | Ozima, Minoru | ||
| 9 | Helium-3 | 3He | 10-10 cm3/g | Ozima, Minoru | ||
| 10 | Helium-3, standard deviation | 3He std dev | ± | Ozima, Minoru | ||
| 11 | Helium-4 | 4He | 10-9 cm3/g | Ozima, Minoru | ||
| 12 | Helium-4, standard deviation | 4He std dev | ± | Ozima, Minoru | ||
| 13 | Helium-3/Helium-4 | 3He/4He | 10-4 | Ozima, Minoru | 3He/4He ratio is calibrated against air helium 3He/4He ratio to reduce a mass fractionation effect | |
| 14 | Helium-3/Helium-4, standard deviation | 3He/4He std dev | ± | Ozima, Minoru |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
402 data points