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| Benabdellouahed, Massinissa; Dugue, Olivier; Tessier, Bernadette; Thinon, Isabelle; Guennoc, Pol. |
| New high-resolution seismic data complemented with bedrock samples allowed us to propose a revised geological map of the Bay of Seine and to better define the control by the geological substrate on the morphogenesis and evolution of the Seine River during Pleistocene times. The new data confirm previous works. The Bay of Seine can be divided into two geological parts: a Mesozoic monocline domain occupying most of the bay and a syncline domain, mostly Tertiary, in the north, at the transition with the Central English Channel area. The highlighting of Eocene synsedimentary deformations, marked by sliding blocks in the syncline domain, is one of the most original inputs of this new study in the Bay of Seine that underlines the significant role of the... |
| Tipo: Text |
Palavras-chave: Pléistocène; Normandie; Baie de Seine; Paléo-Seine; Sismique haute résolution; Incision; Nappes étagées; Nappes emboîtées; Contrôle tectonique; Normandy; Bay of Seine; Pleistocene; Paleo-Seine river; High-resolution seismic; Incision; Strath terraces; Fill terraces; Tectonic control. |
| Ano: 2013 |
URL: https://archimer.ifremer.fr/doc/00167/27800/26000.pdf |
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| Reynaud, Jean-yves; Lauriat-rage, Agnès; Tessier, Bernadette; Neraudeau, Didier; Braccini, Eric; Carriol, René-pierre; Clet-pellerin, Martine; Moullade, Michel; Lericolais, Gilles. |
| Macro- and micro-faunas are reported from six gravity cores collected at a mean depth of 150 m in the surficial deposits of the Kaiser sand bank in the Southern Western Channel Approaches. These are bivalves (mainly), gastropods, echinids, crustaceans and foraminifers. These fauna present a very rich association of numerous, well preserved species from various ecological settings. Such an association is commonly reported from the continental shelf of the last transgressive cycle. In addition, the sediment comprises two imported faunal associations. The first one corresponds to thanatocaenoses of Pliocene/lowermost Pleistocene and Weichselian age, reworked respectively from the underlying celtic incised valley fills and the Celtic Sand Banks. The absence of... |
| Tipo: Text |
Palavras-chave: Continental shelf; Thanatofauna; Sea level; Reworking; Transport. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00146/25682/23843.pdf |
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| Baltzer, Agnès; Tessier, Bernadette; Nouze, Herve; Bates, R; Moore, C; Menier, D. |
| The presence of gas is a common feature in many seismic sections. However, the origin of the gas is often difficult to determine. Recently acquired very high resolution seismic profiles using an IKB Seistec boomer provide useful insight to the understanding of the gas origins in a range of environmental settings including sea lochs and coastal lagoons. The gas features are described both from a qualitative point of view through their acoustic facies, and quantitatively through the associated seismic signal (polarisation, amplitude). Acoustic facies include acoustic turbidity, gas "curtains" and "blankets" as well as "white fringes" and "black shadows". All the features encountered have been related to specific gas nature generated by different sources... |
| Tipo: Text |
Palavras-chave: Signal amplitude; Signal polarisation; Gas; Acoustic facies; Seistec profiles. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-835.pdf |
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