Table 4. 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 | L 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.