| Titre | Conclusion. Les mécanismes du soulèvement des bourrelets | |
|---|---|---|
| Auteur | Pierre Birot | |
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Revue | Bulletin de l'Association de Géographes Français |
| Numéro | no 489-490, 1982 | |
| Rubrique / Thématique | Séance du 6 novembre 1982 Séance sur les bourrelets marginaux (The marginal bulges of the old shields) Thème 2 : Les bourrelets intertropicaux (The intertropical bulges) |
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| Page | 268-269 | |
| Résumé anglais |
Conclusion : the mechanisms of uplift. In the most cases (excepting northern Ghats and perhaps south african bulge), the mechanisms of uplift will be sought into light infracrustal roots, proceeding either directly from heating, either from transformation of ec/ogites into gabbros. The models must take into account the rythm of uplift, as registered by geomorphological-geological research.
Some mechanisms of uplift of the bulges have been discussed. M.F. André suggests that asthenosphere is pushed beneath the continental bulge by subsidence of the dead cooling Labrador dorsal. Y. Battiau-Queney invokes the excess of lithostatic preasure in the new oceanic lithosphere respect to the continental one. P. Birot tests a model where the light roots of the bulges result from the thermal thinning of continental lithosphère «eaten» by warmer asthenosphere. But the process probably exceeds the imparted geological time. Better achievement is obtained by the model of Mlle Fleitout where the heating of the cold continental lower lithosphere proceeds from its replacing by advection of infra-oceanic matter. Source : Éditeur (via Persée) |
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| Article en ligne | https://www.persee.fr/doc/bagf_0004-5322_1982_num_59_489_5359 |
