| Autor: |
Winterer, E.L., Curray, J.R., Peterson, M.N.A. |
| Zdroj: |
Deep Sea Research and Oceanographic Abstracts; October 1968, Vol. 15 Issue: 5 p509,IN1,51-512,IN2,52, 466p |
| Abstrakt: |
Continuous reflection profiles (ARCER) of the region where the Pioneer Fracture Zone intersects the Delgada Deep-Sea Fan (39°N 127°W) show that the top of the seismic second layer is displaced along the fracture zone, but that the overlying sediments are undisturbed by faulting. At the foot of the continental slope, 200 km east of this area (depth 30 m) the sediments are about 1·5 km thick and mask all relief on the top of the second layer. In this area of investigation (depth 4500 m) the fan sediments are only 0·5 km thick and the bottom topography is a subdued replica of the relief on the buried upper surface of the second layer: where the buried relief is rough, the bottom is hilly; where smooth, the bottom is likewise smooth. At the distal edge of the fan, abyssal hills and smooth areas, which continue up into the fan, are underlain by similar thicknesses of sediments which are mineralogically nearly indistinguishable. We therefore infer that sedimentation in the two contrasting physiographic areas in this distal portion of the fan is controlled mainly by the same mechanisms, predominantly pelagic, rather than turbidity-current, deposition of sediment. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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