Morton, Andrew C; Taylor, Paul N (1987): (Table 1) Lead isotopic compositions of basalts from DSDP Hole 81-553 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.770021, Supplement to: Morton, AC; Taylor, PN (1987): Lead isotope evidence for the structure of the Rockall dipping-reflector passive margin. Nature, 326(6111), 381-383, https://doi.org/10.1038/326381a0
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Abstract:
The passive continental margin south-west of Rockall Plateau is characterized by a thick sequence of oceanward-dipping seismic reflectors. During Leg 81 of the Deep Sea Drilling Project, these reflectors were sampled at Site 553 and proved to consist almost exclusively of basalt. Here we present lead isotope data which indicate that these basalts may have been contaminated by ancient uranium-depleted continental crust, or alternatively, derived from a sub-continental lithospheric mantle source. In either case, the implications are that the basalts of the south-west Rockall Plateau formed by eruption through and onto continental basement, not by 'subaerial seafloor spreading'. This conclusion is in accord with gravity models of the area, which predict stretched continental crust beneath the dipping reflector sequence.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 56.088700 * Longitude: -23.343500
Date/Time Start: 1981-08-07T00:00:00 * Date/Time End: 1981-08-07T00:00:00
Minimum Elevation: -2329.0 m * Maximum Elevation: -2329.0 m
Event(s):
81-553 * Latitude: 56.088700 * Longitude: -23.343500 * Date/Time: 1981-08-07T00:00:00 * Elevation: -2329.0 m * Penetration: 9 m * Recovery: 8.3 m * Location: North Atlantic/PLATEAU * Campaign: Leg81 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 1 cores; 9 m cored; 0 m drilled; 92.6 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Morton, Andrew C | DSDP/ODP/IODP sample designation | ||
| 2 | Lead-206/Lead-204 ratio | 206Pb/204Pb | Morton, Andrew C | |||
| 3 | Lead-207/Lead-204 ratio | 207Pb/204Pb | Morton, Andrew C | |||
| 4 | Lead-208/Lead-204 ratio | 208Pb/204Pb | Morton, Andrew C |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
36 data points
Data
| 1 Sample label | 2 206Pb/204Pb | 3 207Pb/204Pb | 4 208Pb/204Pb |
|---|---|---|---|
| 81-553-38-1,39-41 | 18.035 | 15.567 | 37.684 |
| 81-553-40-2,79-81 | 18.111 | 15.538 | 37.833 |
| 81-553-45-3,79-81 | 17.675 | 15.503 | 37.349 |
| 81-553-47-3,30-32 | 17.968 | 15.493 | 37.589 |
| 81-553-49-3,75-77 | 18.180 | 15.553 | 37.914 |
| 81-553-51-2,80-82 | 17.910 | 15.518 | 37.584 |
| 81-553-53-3,116-118 | 18.092 | 15.511 | 37.705 |
| 81-553-54-4,60-62 | 17.190 | 16.527 | 37.002 |
| 81-553-58-1,79-81 | 17.799 | 15.534 | 37.526 |