File:Cycle émersif Oman.jpg
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Summary
| Description |
Français : Séquence émersive de comblement dans le lagon liasique (-190 Ma) de la Péninsule du Musandam (sultanat d'Oman). Le cycle se termine en milieu inter à supratidal avec des tapis algaires dolomitisés (en jaune). Ces cycles (connus du Trias au Jurassique sur les deux rives de la Téthys) sont arrangés en séquences d'ordre supérieur, déca à hectométriques, soulignées par des discontinuités. Des tentatives de corrélations, basées sur ces discontinuités, ce sont soldées par un échec, lors de la réévaluation des âges biostratigraphiques. Ainsi le contrôle par la micropaléontologie des algues et des foraminifères reste indispensable pour étalonner les discontinuités majeures (BRGM, comm. pers., 1992). Voir aussi Septfontaine & De Matos (1998). Il est donc illusoire de parler de "stratigraphie de haute résolution", comme outil de corrélation, dans le cadre de la stratigraphie séquentielle, sans contrôle stricte par la paléontologie, comme dans le Crét. inf. de la plate-forme jurassienne (Strasser et coll, etc.). Unknown shallowing upward sequence in the liassic lagoon of the musandam peninsula (oman). inter to supratidal, algal, deposits on top (yellow). such cycles (auto and allocyclic) are well known around the mesozoic tethys, from morocco to arabia. these beds are arranged in deca to hectometric sequences, separated by important discontinuities. tentatives of correlations of major discontinuities were unsucessfull, after biostratigraphic control (brgm pers. comm., 1992); see also septfontaine & de matos (1998) for stratigraphical setting. |
| Date | |
| Source | Own work |
| Author | Septfontaine |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 12:42, 24 March 2012 | | 1,795 × 1,304 (1.61 MB) | Septfontaine |
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