|
|
|
|
| |
|
|
| Le Pichon, Xavier; Cressard, Alain; Mascle, Jean; Pautot, Guy; Sichler, Bertrand. |
| In 1921 the "Pourquoi pas?" undertook, under the authority of J. Charcot, an identification of the Rockall bank (2). The petrographic nature of this relief was studied by Lacroix (2) who concluded to aegirine granite dated, since then, by Miller (3) and Sabine (4), from the early Tertiary period. At the beginning of the Noratlante cruise, in August 1969, the "J. Charcot" carried out a number of profiles, tallying the Porcupine and the Rockall area (fig.1). In addition to the gravimetry and magnetism recordings, an oblique-reflection profile and six Flexotir seismic-reflection profiles (with a frequency comprised of between 10 and 30 cycles) were carried out. We only present here the first results based on this last technique. |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1970 |
URL: http://archimer.ifremer.fr/doc/1970/publication-4873.pdf |
| |
|
|
| Debyser, J.; Lenoble, J.-p.; Augris, Claude; Cressard, Alain; Lemaire, J.. |
| Les sables et graviers font partie de la branche "granulat" dans laquelle sont regroupés les sables et graviers d'alluvions, les matériaux concassés de carrières (éruptifs et calcaires) ainsi que les sous-produits industriels comme le laitier des hauts-fourneaux. Ces granulats sont destinés à trois types d'emplois : - les bétons pour lesquels on utilise principalement les sables et graviers d'alluvions ; - la confection des routes dans lesquelles il faut distinguer les couches de roulement constituées de matériaux concassés à haute performance, et les couches de bases et de fondations dont le choix dépendra essentiellement du coût du matériau rendu au chantier ; - les autres emplois relativement moins importants où le choix est surtout fonction de... |
| Tipo: Text |
|
| Ano: 1976 |
URL: http://archimer.ifremer.fr/doc/00103/21467/19048.pdf |
| |
|
|
| Augris, Claude; Cressard, Alain. |
| Urbanization and the protection of sites and ground waters reduce the number of alluvial aggregate exploitation areas. The ocean provides different substitution possibilities. In France, marine aggregates represent a substantial potential in the supply of material from coastal regions. A large number of cruises on the French continental shelf, using different exploration (seismic, drilling, dredging) and identification techniques, enabled the C.N.E.X.O. to make an inventory of the resources and to bring to light some workable deposits. Aggregate exploitation in France is distributed between the English Channel and the Atlantic Ocean. It depends on different factors: technical elements, environmental impact and economical data. Marine aggregate dredging is... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/rapport-4940.PDF |
| |
|
|
|
