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A generalized pelagic sedimentation is established after this
late erosion and the ridge is covered by white, soft oozes and
lumashelic chalks. These formations are rich in debris of gastropods and echinoids as well as in benthic and planktonic
foraminifers cemented in a Pleistocene nannoplankton matrix.
Updated correlation
This article shows the need for major correlation changes, on
both the eastern (Malagasy) portion and the western (
Mo-zambican) portion of the DFZ, and yields the following con-clustions:.
• Mio-Pliocene is thinner than expected.
• Oligocene may be absent (probably on the Malagasy side).
• Eocene is thin and may be absent on certain portions
of the DFZ.
• Upper Cretaceous is thicker than expected.
• Turonian and Albian are apparently present on all
parts of the DFZ.
• The Albian sands which are producing in western
Madagascar (West Manambolo- 1) seem to be well developed
(500-850 m) and constitute a major objective.
The DFZ appears to have assumed its structural charac-
ter mostly during Late Cretaceous (Coniacian, Santonian)
which was followed by a long hiatus. The erosion of the
ridge seems to be localized and the presence of well-defined
depositional channels in the Tertiary is not readily apparent,
most likely because a good part of the DFZ was emergent for
a long time.
Acknowledgments
This information is a compilation of reports, publications
and studies on 63 piston cores and 15 dredge hauls, among
119 samples, recovered during the R/V Marion Dufresne
cruise (MD39) in 1984 and the R/V Suroit cruise (SU2) in
1979. Cruise MD39 was funded by the Territoire des Terres
Australes et Antarctiques Francaises in 1984. More than one
ton of dredged rocks from the Davie Ridge are preserved in
the Lithotheque Marine of the National Museum of Natural
History in Paris. Seismic was courtesy of CNRS-IPGS/GeoA-zur. This synthesis completes previous work of one of the
authors, Yannis Bassias, on the crystalline basement and the
Cretaceous volcanism of the DFZ.
References
1. Heirtzler, J.R., and Burroughs, R.H., “Madagascar’s paleo-position: New data from the Mozambique Channel,” Science, Vol.
174, No. 4008, October 1971, pp. 488-490.
2. Segoufin, J., “Anomalies magnétiques mésozoïques dans
