Table 4 K–Ar age data
Sample | Type | ID | K | Rad. 40Ar | Rad. 40Ar | Age | Error | Timescale |
|---|---|---|---|---|---|---|---|---|
|  |  | (µm) | (%) | (mol/g) | (%) | (Ma) | (Ma) | Period–epoch–stage |
Atera 1 | Welded tuff breccia | 3369 < 0.1 | 3.56 | 2.5354E-10 | 78.9 | 40.6 | 1.0 | Paleogene–Eocene–Bartonian |
|  |  | 3369 < 2 | 4.44 | 3.9201E-10 | 93.7 | 50.2 | 1.2 | Paleogene–Eocene–Ypresian |
|  |  | 3369 2–6 | 4.00 | 4.1703E-10 | 94.9 | 59.1 | 1.4 | Paleogene–Paleocene–Thanetian |
|  |  | 3369 6–10 | 3.92 | 4.1464E-10 | 95.7 | 60.0 | 1.4 | Paleogene–Paleocene–Selandian |
Atera 2 | Fault core | 3370 < 0.1 | 2.74 | 2.0091E-10 | 89.5 | 41.8 | 1.0 | Paleogene–Eocene–Lutetian |
|  |  | 3370 < 2 | 2.80 | 2.1694E-10 | 88.3 | 44.1 | 1.0 | Paleogene–Eocene–Lutetian |
|  |  | 3370 2–6 | 3.18 | 2.9515E-10 | 92.6 | 52.7 | 1.2 | Paleogene–Eocene–Ypresian |
Kawaue 1 | Granite cataclasite | 3367 < 2 | 4.98 | 4.1180E-10 | 92.9 | 47.1 | 1.1 | Paleogene–Eocene–Lutetian |
Tsukechi River 1 | Welded tuff host rock | 3510 WR | 1.57 | 1.5170E-10 | 81.6 | 54.9 | 1.3 | Paleogene–Eocene–Ypresian |