Rea, David K; Leinen, Margaret W (1986): (Table 1) Subsidence and calcite accumulation for South Pacific DSDP drill sites [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.789439, Supplement to: Rea, DK; Leinen, MW (1986): Crustal subsidence and calcite deposition in the South Pacific Ocean. In: Leinen, M; Rea DK; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 92, 299-303, https://doi.org/10.2973/dsdp.proc.92.112.1986
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Abstract:
Patterns of crustal subsidence in the southeast Pacific Ocean reflect the complex tectonic history of that region. A plot of the depth-time history of calcite accumulation recorded at DSDP sites beneath the oligotrophic subtropical gyre allows us to define the Neogene history of the calcite compensation depth (CCD) and the lysocline. The CCD shoaled from 4200 to 3700 m between 24 and 20 Ma and then deepened to near the present depth of 4100 m by 5 Ma. The lysocline became distinctly separate from the CCD between 20 and 17 Ma. By 14 Ma, the lysocline rose to 600 m above the CCD, where it has remained until the present. We interpret these data to reflect an increase in the volume of Antarctic Bottom Water beginning at 18 or 19 Ma and reaching a steady-state condition by 14 Ma, the time of rapid ice build-up in Antarctica.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: -15.343125 * Median Longitude: -111.552763 * South-bound Latitude: -19.451500 * West-bound Longitude: -134.266700 * North-bound Latitude: -9.006700 * East-bound Longitude: -81.904000
Date/Time Start: 1969-11-24T00:00:00 * Date/Time End: 1983-03-25T00:00:00
Minimum DEPTH, sediment/rock: 3443 m * Maximum DEPTH, sediment/rock: 4889 m
Event(s):
8-75 * Latitude: -12.516700 * Longitude: -134.266700 * Date/Time: 1969-11-24T00:00:00 * Elevation: -4181.0 m * Penetration: 82.1 m * Recovery: 68.4 m * Location: South Pacific/CONT RISE * Campaign: Leg8 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 10 cores; 81.1 m cored; 0 m drilled; 84.3 % recovery
34-319 * Latitude: -13.017300 * Longitude: -101.524300 * Date/Time: 1974-01-05T00:00:00 * Elevation: -4290.0 m * Penetration: 116.5 m * Recovery: 84.6 m * Location: South Pacific/BASIN * Campaign: Leg34 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 14 cores; 116.5 m cored; 0 m drilled; 72.6 % recovery
34-320 * Latitude: -9.006700 * Longitude: -83.530000 * Date/Time: 1974-01-21T00:00:00 * Elevation: -4483.0 m * Penetration: 111.5 m * Recovery: 19.3 m * Location: South Pacific/BASIN * Campaign: Leg34 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 3 cores; 28 m cored; 0 m drilled; 68.9 % recovery
Comment:
Sediment depth is given as total depth = water depth + sediments. Sediments depress basement by half their thickness (Berger, 1973)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Latitude of event | Latitude | ||||
| 3 | Longitude of event | Longitude | ||||
| 4 | Elevation of event | Elevation | m | |||
| 5 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 6 | Sediment thickness | Sed thick | m | Rea, David K | # = Estimated from seismic reflection records and comparison to adjacent sites | |
| 7 | AGE | Age | ka BP | Geocode | ||
| 8 | Factor | Factor | Rea, David K | Calculated, see reference(s) | Proportionality factor that defines the slope of the seafloor = k | |
| 9 | Age model | Age model | ka | Rea, David K | Age when Z= calcite compensation depth. Site 34-320 was spot cored; youngest carbonate recovered is about 15 Ma. #0 = Site shallower than calcite compensation depth | |
| 10 | Age model, optional | Age model opt | ka | Rea, David K | Age (ka) of *10 reduction in linear sedimentation rate. #0 = Site shallower than lysocline |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
31 data points