Geological Mapping Using Airborne TEM at Mayotte

Airborne electromagnetic methods are practical tools for large scale geological and hydrogeophysical mapping. In this abstract we show results from the SkyTEM survey on the volcanic islands of Mayotte. The SkyTEM survey is an essential part of a project aiming on establishing a basic geological model of Mayotte. Mayotte is a small group of islands between Africa and Madagascar. The results will for instance be used for future urban planning with respect to the risk of landslides and ground stability. Also ground water resources are of high interest and hereby the need for detailed knowledge about the hydrological system and especially the risk of saltwater intrusion to the aquifers. The results from the SkyTEM survey are very promising. The results reveal geological structures both at large scale as well as at the small scale. Though, there is still a large and challenging task at hand in the geological interpretation of the geophysical result and linking resistivity to lithology. Project partners: BRGM, France, Conseil Général de Mayotte, France, and Aarhus University, Denmark.