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| Sibuet, Jean-claude; Srivastava, Shiri. |
| Submarine sedimentary basins parallel to the trends of passive continental margins are well explained by tensional processes between two lithospheric plates. This leaves open the enigma of many basins which strike across margins. We use examples from the North Atlantic to show that such basins may be formed during the initial rifting stage due to enhanced lithospheric thinning caused by the separation of three plates. We suggest that volcanics can be emplaced in these basins and, in the extreme case, where mantle temperature and consequently the degree of partial melting are particularly high, that basaltic flows can be thick enough to fill and hide the basins. |
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| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00196/30732/30291.pdf |
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| Sibuet, Jean-claude; Rouzo, Stephane; Srivastava, Shiri. |
| We have established a new plate kinematic model of the central and North Atlantic oceans between North America, Africa, Meseta, Iberia, Flemish Cap, and Galicia Bank from Late Triassic to Late Cretaceous to better understand the nature and timing of rifting of Nova Scotia and Morocco conjugate continental margins since Late Triassic. The maps of salt distributions at the Sinemurian-Pliensbachian limit (190 Ma; after salt deposition) and in middle Bajocian (170 Ma) show that an area of the Nova Scotia margin is devoid of allochthonous salt and that an area of similar size located oceanward of the West African Coast Magnetic Anomaly shows salt deposits, suggesting that a portion of the Nova Scotia margin with its overlying salt deposits could have been... |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00117/22805/20913.pdf |
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| Sibuet, Jean-claude; Srivastava, Shiri; Manatschal, Gianreto. |
| [1] Transitional zones located between Iberia and North America formed during continental rifting and mostly consist of exhumed mantle. In this study we show that ages of exhumed mantle at Ocean Drilling Program (ODP) sites 1068 and 1070 in the Iberia Abyssal Plain and site 1277 in the Newfoundland Basin are similar to ages determined from magnetic lineations created by serpentinization during mantle exhumation. On the basis of paleomagnetic and geological data and a comparison with a fossil ocean-continent transition in the Alps, we envisage a first episode of mantle serpentinization during which a strong component of magnetization was acquired followed by a second episode occurring at the contact with cold seawater, and which only affects the upper tens... |
| Tipo: Text |
Palavras-chave: Magnetic anomalies; Newfoundland Iberia rift; Exhumed mantle. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3015.pdf |
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