Remote Sensing in Structural Geology - Two Examples.

The ″Remote Sensing Club″ was created on June 1, 1972 by the signing of an agreement between the BRGM, CFP, Elf R. E. , IFP and SNPA. Its aim was to assist participants in obtaining information as well as experimenting and learning to use the techniques of remote sensing. This article describes an experiment which was carried out by the club in the search for oil and minerals on the test zones of Villefranche-de-Rouergue (Aveyron) and Genolhac (Gard). In the former test-zone the starting point was discovery of a circular structure in the center of a granitic horst on one of the ERTS orbital images at 1/1,000,000, which was unknown on the ground. In the Geno text-zone, the existence of temperature recordings taken on a quartz vein and its surrounding mica schists provided access to the thermic properties of these materials and to the moment of the day and the year when the difference of surface temperature between them is at a maximum. This corresponds to the discovery of the best time to carry out thermographic overflights which would detect a thermal anomaly connected with the vein.