CARTOGRAPHY, METALLOGENIC STUDY AND 3D MODELING BY PHOTOGRAMMETRY AND UNDER SURPAC OF MINERALIZED OCCURENCES OF LEAD, ZINC AND COPPER IN THE BARONNIES REGION (05) (26), FRANCE

This project is an introduction to research on the study of mineralized showings of lead, zinc and copper as well as their 3D modeling. The areas studied are located between the French regions of Provence-Alpes-Côte-D'azur and Auvergne-Rhône-Alpes. This corresponds to the dauphinois domain of the Alps and more precisely to the domain of the Baronnies provençales. Two areas are particularly studied: Orpierre and Les Cougnasses as well as Eygalayes. The first zone corresponds to an anticline with predominantly Jurassic facies. In Orpierre itself, former zinc mines were once exploited. At Orpierre and Les Cougnasses, the mineralisations found in the facies of the Bathonian/Bajocian and Aargau correspond to galena, sphalerite and cerussite. Concerning Eygalayes, it is a synclinal structure with facies ranging from Cretaceous to Eocene. In this area, the mineralization found within the cenomanian facies is malachite and azurite. The first study area is affected by tectonic accidents, including a major oriented N20 with normal clearance and senestral component and dexterous replay. The study of tectonic indices made it possible to date lead and zinc mineralizations from the alpine compression of the Miocene. Eygalayes is located in the continuation of this accident oriented N20. However, the study of tectonics does not allow us to precisely date the mineralized veins. Indeed, according to tectonic indices, these mineralizations could have been established in the upper Eocene or also in the Miocene. The outcrops presenting these vein structures were modeled by photogrammetry on Agisoft Photoscan. This resulted in 3D models that were then used on the Surpac software. This software allows to model the extension of the veins by adapting the model according to the type of vein. This makes it possible to observe the intersections and the organization of the veins in 3D. These mineralizations are the result of the hydrothermalism phenomenon that is taking place following the diapirism present in this sector. These diapirs are made of gypsum, which explains the presence of sulphur in the fluids and therefore the mineralization of sulphides such as galena or sphalerite.