Pagani, Mark; Arthur, Michael A; Freeman, Katherine H (2000): (Table 1) Age model of DSDP Site 72-516 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.848096, Supplement to: Pagani, M et al. (2000): Variations in Miocene phytoplankton growth rates in the southwest Atlantic: Evidence for changes in ocean circulation. Paleoceanography, 15(5), 486-496, https://doi.org/10.1029/1999PA000484
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Abstract:
Changes in ocean circulation are often credited as the primary control on large-scale climate change during the Miocene. This study investigates the latest Oligocene to middle Miocene evolution of Southern Ocean circulation by evaluating stable isotopic trends of shallow- and deep-dwelling planktonic foraminifera, as well as epsilon-p records reconstructed from the carbon isotopic composition of diunsaturated alkenones in the southwestern Altantic Ocean (Deep Sea Drilling Project site 516). Changes in epsilon-p at site 516 closely paralleled the opening and deepening of the Drake Passage as inferred from seafloor magnetic anomalies. A large negative shift in epsilon-p at ~20.3 Ma is interpreted to reflect an increase in upper water column nutrient concentrations, caused by the onset or strengthening of the Antarctic Circumpolar Current (ACC). Measurable alkenone concentrations disappear by ~17 Ma, prior to a collapse in surface-to-thermocline d18O and d13C gradients. This is interpreted as reflecting a severe decrease in mixed layer nutrient concentrations and reduced proto-Antarctic Intermediate Water influence. The d18O gradient was reestablished by 14.5 Ma, coincident with the hypothesized East Antarctic ice sheet expansion, suggesting a direct relationship between increased strength of the ACC and the largest climate shift of the middle Miocene.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: -30.276400 * Median Longitude: -35.285100 * South-bound Latitude: -30.276500 * West-bound Longitude: -35.285200 * North-bound Latitude: -30.276300 * East-bound Longitude: -35.285000
Date/Time Start: 1980-03-11T00:00:00 * Date/Time End: 1980-03-11T00:00:00
Minimum DEPTH, sediment/rock: 71.1 m * Maximum DEPTH, sediment/rock: 246.0 m
Event(s):
72-516 * Latitude: -30.276300 * Longitude: -35.285200 * Date/Time: 1980-03-11T00:00:00 * Elevation: -1313.0 m * Penetration: 183.3 m * Recovery: 148.1 m * Location: South Atlantic/CONT RISE * Campaign: Leg72 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 40 cores; 166.1 m cored; 17.2 m drilled; 89.2 % recovery
72-516F * Latitude: -30.276500 * Longitude: -35.285000 * Date/Time: 1980-03-11T00:00:00 * Elevation: -1313.0 m * Penetration: 1270.6 m * Recovery: 690.1 m * Location: South Atlantic/CONT RISE * Campaign: Leg72 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 127 cores; 1092.5 m cored; 9 m drilled; 63.2 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Pagani, Mark | |||
| 2 | Ageprofile Datum Description | Ageprof dat des | Pagani, Mark | FAD = first appearance datum, LAD = last appearance datum | ||
| 3 | DEPTH, sediment/rock | Depth sed | m | Pagani, Mark | Geocode | |
| 4 | Age model | Age model | ka | Pagani, Mark | Age model, paleomag, Berggren et al (1985) |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
36 data points