Takaoka, Nobuo; Nagao, Keisuke (1978): (Table 1) Concentrations and isotopic ratio of Argon in Cretaceous deep-sea basaltic glass of DSDP Hole 51-417D [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.770363, Supplement to: Takaoka, N; Nagao, K (1978): Mantle 40Ar/36Ar trapped in Cretaceous deep-sea basalts. Nature, 276(5687), 491-492, https://doi.org/10.1038/276491a0
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Abstract:
The abundance and isotopic composition of rare gas in the mantle provides an important constraint on the origin and evolution of the Earth's atmosphere. One of sources of such information is basalts which erupted from ocean ridges. Ozima (1975, doi:10.1016/0016-7037(75)90054-X) stated that a high 40Ar/36Ar ratio in the mantle suggests sudden degassing at an early stage of the Earth's evolution. Several authors (Funkhouser et al., 1968, doi:10.1016/S0012-821X(68)80021-4; Darlymple and Moor, 1968, doi:10.1126/science.161.3846.1132) have reported excess 40Ar and high 40Ar/36Ar ratios in rapidly quenched rims of young deep-sea basalts. However, the Ar composition in old ridge basalts was not known. We report here a measurement of the isotopic composition of Ar in old deep-sea basalts. The Glomar Challenger drilled a Cretaceous ocean floor near the southern end of the Bermuda Rise in Deep Sea Drilling Project. The drilled site (Site 417) is on the magnetic anomaly MO which has been estimated to be 108 Myr old.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 25.111500 * Longitude: -68.046800
Date/Time Start: 1976-12-02T00:00:00 * Date/Time End: 1976-12-02T00:00:00
Minimum ORDINAL NUMBER: 1 * Maximum ORDINAL NUMBER: 6
Event(s):
51-417D * Latitude: 25.111500 * Longitude: -68.046800 * Date/Time: 1976-12-02T00:00:00 * Elevation: -5482.0 m * Penetration: 532.5 m * Recovery: 202.6 m * Location: North Atlantic/CONT RISE * Campaign: Leg51 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 43 cores; 508.6 m cored; 30.4 m drilled; 39.8 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | ORDINAL NUMBER | Ord No | Geocode | |||
| 2 | Sample code/label | Sample label | Takaoka, Nobuo | DSDP/ODP/IODP sample designation | ||
| 3 | Argon-36 | 36Ar | 10-9 cm3/g | Takaoka, Nobuo | ||
| 4 | Argon-38/Argon-36 | 38Ar/36Ar | Takaoka, Nobuo | |||
| 5 | Argon-38/Argon-36, standard deviation | 38Ar/36Ar std dev | ± | Takaoka, Nobuo | ||
| 6 | Argon-40/Argon-36 | 40Ar/36Ar | Takaoka, Nobuo | |||
| 7 | Argon-40/Argon-36, standard deviation | 40Ar/36Ar std dev | ± | Takaoka, Nobuo | ||
| 8 | Argon-40/Argon-36 | 40Ar/36Ar | Takaoka, Nobuo | corrected for radiogenic 40Ar produced in basaltic glass for 108 Ma |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
42 data points
Data
| 1 Ord No | 2 Sample label | 3 36Ar [10-9 cm3/g] | 4 38Ar/36Ar | 5 38Ar/36Ar std dev [±] | 6 40Ar/36Ar | 7 40Ar/36Ar std dev [±] | 8 40Ar/36Ar (corrected for radiogenic 40Ar...) |
|---|---|---|---|---|---|---|---|
| 1 | 51-417D-22-3,24-27 | 1.440 | 0.194 | 0.002 | 1341 | 7 | 1090 |
| 2 | 51-417D-22-3,24-27 | 2.140 | 0.187 | 0.003 | 819 | 22 | 650 |
| 3 | 51-417D-28-5,85-92 | 1.650 | 0.191 | 0.002 | 1103 | 7 | 861 |
| 4 | 51-417D-28-5,85-92 | 4.420 | 0.186 | 0.002 | 557 | 7 | 466 |
| 5 | 51-417D-29-6,95-104 | 0.998 | 0.188 | 0.004 | 1686 | 11 | 1353 |
| 6 | 51-417D-29-6,95-104 | 5.950 | 0.190 | 0.004 | 567 | 17 | 511 |