| Autor: |
Lort, J., Limond, W., Segoufin, J., Patriat, Ph., Delteil, J., Damotte, B. |
| Zdroj: |
Marine Geophysical Research; Aug1979, Vol. 4 Issue 1, p71-89, 19p |
| Abstrakt: |
This paper presents seismic reflection and refraction data from the Mozambique Channel, collected between 1971 and 1973. A deep sedimentary basin (up to 5 km of sediments) opens southwards to the Mozambique Basin, and is bounded to the east by the Davie Ridge and beyond by the marginal plateau of Malagasy. A continuous reflector (C), possibly of Cretaceous age, is identified between layers having seismic interval velocities of 2.4-2.8 km/s and 3.1-3.4 km/s. The deepest sediments have velocities of 4.5-4.9 km/s and overlie a layer with velocity 5.5 km/s, which may be volcanic in the north-east of the Channel. The crust occupying most of the Channel is probably pre-Cretaceous in age, and may be largely continental in nature. This is supported by subdued magnetic anomalies and the possibility of a continuous Karroo sedimentary section across the northern Channel. The oceanic crust of the Mozambique Basin may extend as far north as 24°S, into the western Channel only. The problem of the origin of the Mozambique Channel remains unresolved, although a long sedimentary history indicates that Malagasy may have separated from Mainland Africa prior to Karroo times. The Davie Ridge may possibly represent a relict strike-slip fault, which permitted movement along a north-south line. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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