|
|
|
|
|
| Louvel, Veronique; Dyment, Jerome; Sibuet, Jean-claude. |
| The deep seismic reflection profile Western Approaches Margin (WAM) cuts across the Goban Spur continental margin, located southwest of Ireland. This non-volcanic margin is characterized by a few tilted blocks parallel to the margin. A volcanic sill has been emplaced on the westernmost tilted block. The shape of the eastern part of this sill is known from seismic data, but neither seismic nor gravity data allow a precise determination of the extent and shape of the volcanic body at depth. Forward modelling and inversion of magnetic data constrain the shape of this volcanic sill and the location of the ocean-continent transition. The volcanic body thickens towards the ocean, and seems to be in direct contact with the oceanic crust. In the contact zone, the... |
| Tipo: Text |
Palavras-chave: Continental margin; Goban Spur; Magnetic anomalies; Ocean-continent boundary. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00337/44777/44601.pdf |
| |
|
|
| Whitmarsh, Robert B; White, Robert S; Horsefield, Susan J; Sibuet, Jean-claude; Recq, Maurice; Louvel, Veronique. |
| A seismic refraction transect across the Galicia Bank continental margin shows that the original continental crust thins westward from 17 to 2 km immediately east of a margin-parallel peridotite ridge (PR). immediately west of the PR, oceanic crust is only 2.5-3.5 km thick, but farther west (oceanward) it thickens to 7 km. The PR caps a similar to 60-km-wide lens-shaped serpentinized peridotite body underlying both thinned continental and thin oceanic crust. When superimposed on a reflection time version of the velocity model, the S reflector is clearly intracrustal at its east end. Westward, S cuts down to lower crustal levels, eventually coinciding with the top of the serpentinized peridotite lens (original crust-mantle boundary). These observations... |
| Tipo: Text |
|
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00281/39255/43277.pdf |
| |
|
|
|
