40Ar-39Ar dating of rocks drilled at sites 60-458 and 60-459
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
1982
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| _version_ | 1867169510056787968 |
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| author | Takigami, Yutaka Ozima, Minoru |
| author_facet | Takigami, Yutaka Ozima, Minoru |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_820217 |
| institution | PANGAEA |
| language | en |
| publishDate | 1982 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | 40Ar-39Ar dating of rocks drilled at sites 60-458 and 60-459 Takigami, Yutaka Ozima, Minoru 60-458; 60-459; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg60; North Pacific/SEDIMENT POND; North Pacific/TRENCH 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. |
| title | 40Ar-39Ar dating of rocks drilled at sites 60-458 and 60-459 |
| topic | 60-458; 60-459; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg60; North Pacific/SEDIMENT POND; North Pacific/TRENCH |
| url | https://doi.org/10.1594/PANGAEA.820217 |