Table 1 Sampling locations and mineralogy of the studied samples
Cruise | Dredge/Dive number | Sampling location (WGS84) | Depth (mbsl) | Sample name | Rock type | Mineralogy | 238U/206Pb* age (this study) | Reference | Map key |
|---|---|---|---|---|---|---|---|---|---|
KH-18-2 | D05 | 23° 51.7310′ N 138° 57.8930′ E | 4522 | D05-101A | Varitextured gabbro | Pl, Cpx, Amp, Ol | 12.96 ± 0.30 Ma | 1, 2 | 6 |
D05-101B | Hybridized gabbro | Pl, Cpx, Amp, Ol, Ox | 13.12 ± 0.37 Ma | 1, 2 | 6 | ||||
D12 | 23° 49.3060′ N 138° 47.6350′ E | 5403 | D12-401 | Diorite | Pl, Amp | 13.17 ± 0.71 Ma | 7 | ||
YK18-07 | 6K1515 | 23° 50.4372′ N 138° 48.3942′ E | 5073 | 6K1515-R14 | Oxide gabbro | Pl, Cpx, Ox, Amp | 12.54 ± 0.56 Ma | 1, 2 | 3 |
YK19-04S | 6K1536 | 23° 49.7226′ N 138° 56.6931′ E | 3608 | 6K1536-R14a | Coarse‐grained olivine gabbro | Pl, Cpx, Ol, Amp | 12.70 ± 0.33 Ma | 1 | 9 |
23° 49.6782′ N 138° 56.6738′ E | 3540 | 6K1536-R18 | Coarse‐grained olivine gabbro | Pl, Cpx, Ol, Amp, Ox | 11.74 ± 0.61 Ma | 1, 2 | 9 | ||
23° 49.6532′ N 138° 56.6656′ E | 3498 | 6K1536-R20 | Mylonitic olivine gabbro | Pl, Cpx, Amp, Ol, Ox | 12.83 ± 0.41 Ma | 1 | 9 | ||
YK20-18S | 6K1569 | 23° 53.3793′ N 138° 49.0433′ E | 5713 | 6K1569-R04 | Olivine gabbro | No thin section | 13.15 ± 2.27 Ma | 2 | 13 |
23° 53.3793′ N 138° 49.0433′ E | 5713 | 6K1569-R06 | Oxide gabbro | No thin section | 12.22 ± 0.37 Ma | 2 | 13 |