Structure et volcanisme d'un rift sous-marin: Le fossé des Kérimbas (marge nord - Mozambique)
Mougenot, D.; Hernandez, J.; Virlogeux, P. (1989). Structure et volcanisme d'un rift sous-marin: Le fossé des Kérimbas (marge nord - Mozambique). Bull. Soc. Géol. Fr. 5(2): 401-410
In: Bulletin de la Société Géologique de France. Société Géologique de France: Paris. ISSN 0037-9409; e-ISSN 1777-5817, more
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| Keywords |
Reflection > Seismic reflection
Rift zones
Topographic features > Submarine features > Continental margins
Volcanism
ISW, Mozambique [Marine Regions]
Marine/Coastal |
| Authors | | Top |
- Mougenot, D.
- Hernandez, J.
- Virlogeux, P.
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| Abstract |
On the continental margin of the northern Mozambique, a flat-bottomed trough, the north-south trending Kerimbas deep graben, disrupts the continental slope alongside an alignment of seamounts forming the Davie Ridge. Water-gun seismic reflection lines, implemented throughout the region during MD40/MACAMO cruise, show that the graben, cut into Tertiary sediments, corresponds : eastward, to a former discontinuity several times reactivated and located above an abrupt uplift of the Moho; westward, to a Miocene tilting or a recent normal fault. On both sides and at its southern end, the graben supports alkaline basalts intrusive into Neogene sediments. The Kerimbas graben, seaward extension of the East African Rift, is currently propagating at both ends of the trough, as indicated by recent faults and rather intense seismicity. |
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