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| Channell, J. E. T.; Harrison, R. J.; Lascu, I.; Mccave, I. N.; Hibbert, F. D.; Austin, W. E. N.. |
| Core MD04-2822 from the Rockall Trough has apparent sedimentation rates of ∼ 1 m/kyr during the last deglaciation (Termination I). Component magnetization directions indicate a magnetic excursion at 16.3 m depth in the core, corresponding to an age of 26.5 ka, implying an excursion duration of ∼350 years. Across Termination I, the mean grain size of sortable silt implies reduced bottom-current velocity in the Younger Dryas and Heinrich Stadial (HS)-1A, and increased velocities during the Bølling-Allerød warm period. Standard bulk magnetic parameters imply fining of magnetic grain size from the mid-Younger Dryas (∼12 ka) until ∼ 8 ka. First-order reversal curves (FORCs) were analyzed using ridge extraction to differentiate single domain (SD) from background... |
| Tipo: Text |
Palavras-chave: Magnetic granulometry; FORC-PCA analysis; Sortable silt; Magnetic excursion; Termination I; Rockall Trough. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00333/44456/44128.pdf |
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| Klingelhoefer, Frauke; Edwards, R; Hobbs, R; England, R. |
| [1] Two wide-angle seismic lines located in the northern Rockall Trough were acquired in May 2000. One line ( line E) crosses the trough from the continental shelf off Lewis to normal oceanic crust west of Lousy Bank in NW-SE direction. The other line ( line D) intersects with line E, crosses the Wyville-Thomson Ridge in a SW-NE direction and ends in the Faeroe-Shetland Basin. Sonobuoy data and expanding spread profiles acquired in the same area have been remodeled. Analysis of the seismic data using travel times and amplitudes reveals an up to 5 km thick sedimentary basin including an up to 1.5 km thick basaltic layer which is present in most of the trough. Further conclusions of this study are that the Rockall Trough is underlain by highly stretched... |
| Tipo: Text |
Palavras-chave: Crustal structure; Wide angle seismics; Rockall Trough. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-881.pdf |
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