La prospection gravimétrique dans la modélisation d'un substratum sous formation sédimentaire : apport à l'hydrogéologie d'une zone semi-aride du Sud de Madagascar |
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| Authors: | Heritiana Rakoto Pierre Andrieux Jean-Bruno Ratsimbazafy Vittorio Iliceto Eddy Rasolomanana Louis Pastor Gian Maria Zuppi |
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| Institution: | 1. Institut et observatoire de géophysique d''Antananarivo (IOGA), BP 3843, 101 Antananarivo, Madagascar;2. Università Cà Foscari di Venezia, Calle Larga Santa Marta, Dorsoduro 2137, 30123 Venezia, Italy;3. Département de géophysique appliquée, université Paris-6, 4, place Jussieu, 75252 Paris cedex 05, France;4. Dipartimento di Geologia, Paleontologia e Geofisica, Università degli Studi di Padova, via Giotto 1, 35137 Padova, Italy |
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| Abstract: | A gravimetric survey has been carried out in a sedimentary basin, south of Madagascar, in order to define the bedrock morphology. The bedrock is made up of crystalline and volcanic rocks. The objective of the survey was to demonstrate whether a relationship could be established between bedrock morphology and groundwater mineralisation. Indeed, bedrock morphology has been successfully mapped and it is confirmed that most of the low mineralisation wells are located in areas where the slope of the bedrock is trending to the south-west, which ensures a higher hydraulic conductivity, i.e. a faster water flow, than in the other parts of the survey area. To cite this article: H. Rakoto et al., C. R. Geoscience 335 (2003). |
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| Keywords: | gravimétrie bassin sédimentaire Sud de Madagascar substratum hydrogéologie minéralisation semi-aride gravimetry sedimentary basin South of Madagascar bedrock hydrogeology mineralisation semi-arid |
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