Table T4. Tectonic history of DSDP and ODP sites in the region.
|
Site
|
Block/basin
|
Oldest sediment
near site |
Probable
breakup age (Ma) |
Siliciclastic/carbonate
transition |
Subsidence since
Eocene (no correction for sediment loading) |
|---|---|---|---|---|---|
| 282 | Sorell Basin | Early Cretaceous | 55 (west) | Oligocene/Miocene | 3800* |
| 1168 | Sorell Basin | Early Cretaceous | 55 (west) | Eocene/Oligocene | 3100† |
| 1170 | West STR | Late Cretaceous | 55 (south)34 (west) | Eocene/Oligocene | 3100† |
| 281 | Central STR | Late Cretaceous | 75 (east)55 (south)34 (west) | Oligocene/Miocene | 1600† |
| 1171 | Central STR | Late Cretaceous | 75 (east)55 (south)34 (west) | Eocene/Oligocene | 2300† |
| 280 | Southern oceanic crust | Eocene | 55 (north) | Within Eocene: to diatom ooze | 3200‡ |
| 1172 | East Tasman Plateau | Cretaceous | 75 (east and west) | Eocene/Oligocene | 2500† |
| 283 | Tasman Sea oceanic crust | Paleocene | 75 (west) | None | 3700‡ |
Notes: STR = South Tasman Rise. * = assuming latest Eocene water depth of ~500 m, † = assuming latest Eocene water depth of ~100 m, ‡ = assuming latest Eocene water depth of ~1000 m.