Table 2 Comparison of estimated uplift rates for Kitadaito Jima and Minamidaito Jima in this and previous studies
From: Uplift rate of Kitadaito Jima Island on the lithospheric forebulge of the Philippine Sea Plate
| Â | Method of rate determination | Sample elevation (m) | Paleo-water depth of sample(s) | Age | Sea level at the average age (m) | Average uplift rate (m/Myr) | Remarks | References | |
|---|---|---|---|---|---|---|---|---|---|
Ma | Method | ||||||||
Kitadaito Jima | Coral date and sample elevation |  ~ 10 (Raised surf bench) | Near the intertidal zone | 0.123 (average) | 230Th/234U | 6 | 33 | The average age of corals collected at < 8.1 m elevation was regarded as the formation age of the raised surf bench at ~ 10 m elevation. Those corals were inferred to have lived near the intertidal zone | |
|  | Modeled subsidence–uplift curve |  |  | ca. 4–7 |  |  | 10–35 | The rate is not reproduced from the various values given in their paper | Ohde and Elderfield (1992) |
|  | Coral date and sample elevation | 8.1 (The upper limit of occurrence of corals) | Not considered | 0.12–0.13 | 230Th/234U | 6 | 16–18 | Paleodepth at which coral lived is not considered Coral ages of Ota et al. (1991) were cited | Ohde and Elderfield (1992) |
| Â | Elevation contrasts between Kitadaito Jima and Okidaito Jima | Â | Â | 2 | Â | Â | 22 | Â | Ohde and Elderfield (1992) |
|  | Sr-isotope age of a deposit filling an intertidal erosional notch and its elevation | 71 | Intertidal | 1.89 | 87Sr/86Sr | − 21 | 49 |  | This study |
Minamidaito Jima | Coral date and sample elevation | 12.7 (Raised surf bench) | Near the intertidal zone | 0.123 (average) | 230Th/234U | 6 | 54 | The average age of corals collected at < 11 m elevation was regarded as the formation age of the raised surf bench at 12.7 m elevation. Those corals were inferred to have lived near the intertidal zone | |
|  | Coral date and sample elevation | 9.6 (The upper limit of occurrence of corals) | Not considered | 0.12–0.13 |  | 6 | 28–30 | Paleodepth at which coral lived is not considered Coral ages of Ota et al. (1991) were cited | Ohde and Elderfield (1992) |
|  | Sr isotope ages of reef deposits (non-dolomitized island-surface samples) and sample elevation | 15.9 17.1 | Not considered | 0.7 (+ 0.7/− 0.4) 0.9 (+ 0.4/− 0.3) | 87Sr/86Sr | Not considered | 23 (11–53) 19 (13–29) | For revised uplift rates, see discussion and Table 3 | Ohde and Elderfield (1992) |