2003
DOI: 10.1016/s1631-0713(03)00060-9
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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

Abstract: La méthode gravimétrique a été utilisée dans le bassin sédimentaire de la zone semi-aride du Sud de Madagascar pour déterminer la morphologie du toit du substratum, qui est constitué de roches cristallines et volcaniques. La structure morphologique du substratum influe sur l'hydrogéologie et la dynamique de l'eau souterraine de la zone. La corrélation entre la répartition de la conductivité électrique de l'eau et la morphostructure du substratum (forme et linéament) confirme l'étroite dépendance des deux param… Show more

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Cited by 2 publications
(2 citation statements)
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“…These models were constructed taking into account the topographic correction (Hammer, 1982) with the software Gravmag V 1.7 (Pedley et al, 1993). During the modelling, the average density assigned to the metamorphic basement rocks was 2670 kg/m 3 (Robinson and Çoruh, 1988;Telford et al, 1990) and 1950 kg/m 3 to the alluvial sediments that comprise the aquifer (Sclater and Christie, 1980;Angelillo et al, 1991;Rakoto et al, 2003;Martínez-García and Soto, 2006) (Fig. 5).…”
Section: Gravimetrymentioning
confidence: 99%
See 1 more Smart Citation
“…These models were constructed taking into account the topographic correction (Hammer, 1982) with the software Gravmag V 1.7 (Pedley et al, 1993). During the modelling, the average density assigned to the metamorphic basement rocks was 2670 kg/m 3 (Robinson and Çoruh, 1988;Telford et al, 1990) and 1950 kg/m 3 to the alluvial sediments that comprise the aquifer (Sclater and Christie, 1980;Angelillo et al, 1991;Rakoto et al, 2003;Martínez-García and Soto, 2006) (Fig. 5).…”
Section: Gravimetrymentioning
confidence: 99%
“…Time domain electromagnetic (TDEM) soundings is the most reliable electromagnetic method, but results are improved when it is combined with seismic (Shtivelman and Goldman, 2000), nuclear magnetic resonance (Goldman et al, 1994), or magnetotelluric (Krivochieva and Chouteau, 2003) methods. Gravimetry easily discriminates lithologies of different densities, such as the hard, consolidated rocks of a basement compared to the loose, high-porosity sediments comprising the aquifer (Alvarez, 1991;Angelillo et al, 1991;Marín-Lechado et al, 2006;Najine et al, 2006;Pedrera et al, 2006;Rakoto et al, 2003;Rodriguez Fernandez and Sanz de Galdeano, 2006).…”
mentioning
confidence: 99%