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| Registros recuperados: 64 | |
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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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| Melguen, Marthe; Le Pichon, Xavier; Sibuet, Jean-claude. |
| A schematic model of the evolution of the South Atlantic paleoenvironment since the early Cretaceous is proposed. The reconstruction here proposed is based on all the data offered for the South Atlantic by the Deep-Sea Drilling Project. These data are integrated within the framework of Plate Tectonics. The emphasis is put on the methodology available to reconstruct the ocean crust morphology and its sedimentary cover throughout the opennig of the ocean. Paleobathymetric, paleocirculation and paleofacies maps are presented. The paleofacies maps are in great part based on a new paleo-CCD (paleo-calcite compensation depth) curve, which is tentatively proposed here for the South Atlantic. During the early Cretaceous the South Atlantic consisted of two narrow... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1978 |
URL: http://archimer.ifremer.fr/doc/1978/publication-5234.pdf |
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| Sibuet, Jean-claude. |
| Based on the geological and geophysical data on North-East Atlantic margins, the aim of this study is to define the directions of the extension of the different margin segments, and then to constrain the margin formation models in order to try and quantify the extension. The proposed scheme is to try and integrate the available geological and geophysical constraints, keeping in mind that the future data on the deep structure of the margins could quickly lead us to reconsider it. The first kinematical consequences of this scheme are examined. (unverified OCR) |
| Tipo: Text |
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| Ano: 1987 |
URL: http://archimer.ifremer.fr/doc/1987/these-3753.pdf |
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| Louden, K. E; Sibuet, Jean-claude; Foucher, Jean-paul. |
| We present the results of 44 new heat flow stations which were taken in 1984 and 1989 in profiles across the Goban Spur and Galicia Bank continental margins (NW Atlantic Ocean). Simple extensional models indicate that the heat flow across both these Early Cretaceous rifted margins should increase from values of 45-50 mW/m2 over oceanic crust to 65-80 mW/m2 on the continents. The rate of this increase should help to constrain the mechanism (simple versus pure shear) by which the upper, more radiogenic continental crust is thinned. Measurements across Goban Spur increase from values of 40-45 mW/m2 over oceanic crust to 50-55 mW/m2 near the continental shelf. They follow the predicted trend for pure-shear rifting, but only if the value of upper crustal... |
| Tipo: Text |
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| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00182/29341/28269.pdf |
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| Registros recuperados: 64 | |
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