Takigami, Yutaka; Ozima, Minoru (1982): 40Ar-39Ar dating of rocks drilled at sites 60-458 and 60-459 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.820217, Supplement to: Takigami, Y; Ozima, M (1982): 40Ar-39Ar dating of rocks drilled at sites 458 and 459 in the Mariana fore-arc region during Leg 60. In: Hussong, DM; Uyeda, S; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 60, 743-746, https://doi.org/10.2973/dsdp.proc.60.141.1982
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Abstract:
40Ar-39Ar dating of a high-MgO bronzite andesite from near the top of basement drilled at Site 458 shows the characteristic symptoms of artificially disturbed samples - i.e., an inverse staircase-type age spectrum, approximate linearity on an isochron plot, and concordance between total fusion age and isochron age. From conclusions based on other artificially disturbed samples (Ozima et al., 1979), we suggest that the reference isochron age (33.6 Ma) approximates the age of the sample.
A basalt from deeper in Hole 458 gives an isochron age of 19.1 ± 0.2 Ma, which is slightly younger than the plateau age of 21.4 ± 1.0 Ma. Both ages are, however, considerably younger than the age of fossils in the overlying sediments (30 - 34 Ma). The age discrepancy may be explained if the 40Ar-39Ar age represents the age of secondary minerals, which formed later.
No useful age data were obtained from a basalt sample recovered from Hole 459B.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 17.863775 * Median Longitude: 147.026100 * South-bound Latitude: 17.862500 * West-bound Longitude: 146.934300 * North-bound Latitude: 17.864200 * East-bound Longitude: 147.301500
Date/Time Start: 1978-04-18T00:00:00 * Date/Time End: 1978-04-25T00:00:00
Event(s):
60-458 * Latitude: 17.864200 * Longitude: 146.934300 * Date/Time: 1978-04-18T00:00:00 * Elevation: -3447.0 m * Penetration: 465.5 m * Recovery: 97.6 m * Location: North Pacific/TRENCH * Campaign: Leg60 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 46 cores; 437 m cored; 28.5 m drilled; 22.3 % recovery
60-459 * Latitude: 17.862500 * Longitude: 147.301500 * Date/Time: 1978-04-25T00:00:00 * Elevation: -4121.0 m * Penetration: 25.5 m * Recovery: 8.2 m * Location: North Pacific/SEDIMENT POND * Campaign: Leg60 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 2 cores; 15.5 m cored; 0 m drilled; 52.8 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Takigami, Y; Ozima, M (1982): (Table 1) 40Ar-39Ar analysis at DSDP Holes 60-458 and 60-459. https://doi.org/10.1594/PANGAEA.820215
- Takigami, Y; Ozima, M (1982): (Table 2) 40Ar-39Ar ages at DSDP Holes 60-458 and 60-459. https://doi.org/10.1594/PANGAEA.820216