L'ouverture et le développement du bassin de Morondava (Madagascar) du Carbonifère supérieur au Jurassique moyen. Données stratigraphiques, sédimentaires, paléontologique
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- 作者：Alain Piqué ; Edgard Laville ; Gé ; rard Bignot ; Mamy Rabarimanana ; Catherine Thouin
- 关键词：Landmines ; Mineral exploration industry ; Metal detection
- 刊名：Journal of African Earth Sciences
- 出版年：1999
- 出版时间：May 1999
- 年：1999
- 卷：28
- 期：4
- 页码：931-948
- 全文大小：2039 K
文摘
In the western part of Madagascar, the Morondava Basin shows the Malagasy Karoo series, made of Late Carboniferous-Mid-Permian (Sakoa), Late Permian-Mid-Triassic (Sakamena) and Late Triassic-Mid-Jurassic (Isalo) sequences. The sedimentary facies are mainly aerial and clastic in the series, and the marine conditions are fully established after Lower Jurassic times, when the strait between Africa and Madagascar was flooded.
The Karoo basins where these series were deposited are mainly hemi-grabens. Their filling proceeded from west to east and from south to north. Distinction between the southern and northern part of the Morondava Basin suggests that development of the basin was controlled by old crustal weakness zones trending north-northwest-south-southeast and north-northeast-south-southwest.