Interpretación geológica de los datos aeromagnéticos de la region de Bou Chber, Macizo Central de Marruecos

This study concerns the geological interpretation of aeromagnetic data of Bou Chber region located in Central Morocco. Processed magnetic maps obtained through different standard methods known in aeromagntism were compared to field geological structures and ancient geological maps. We propose then a geological scheme of the Bou Chber non-mapped area based on the newly interpreted magnetic anomalies of this regionEn este estudio se presenta una interpretación geológica de datos aeromagnéticos en la región de Bou Chber (Marruecos Central). Se han usado mapas aeromagnéticos procesados con métodos convencionales en aeromagnetismo, que se comparan con estructuras geológicas de campo y con mapas geológicos antiguos. Se propone un nuevo esquema geológico de la zona de Bou Chber según la interpretación de anomalías magnéticas aquí descrit

Geologic interpretation of the aeromagnetic survey in the Agourai area (Central Morocco)

Abstract The aim of this work is to interpret the geologic structures of the Agourai area (Paleozoic and Mesozoic structures) from processed magnetic maps. The detected magnetic anomalies from different standard methods used in aeromagnetism (Residual map, RTP map, horizontal gradient map) were compared to geologic structures and permit enhancing the mapping quality of some areas, and thus defining many geologic features. Existing geologic maps and geologic field studies allow interpreting some detected anomalies. It was thus possible to define the limits between the Paleozoic basement and the Mesozoic cover, to determine magnetic anomalies according to NE-SW trends compatible with the regional geologic structures and finally to detect a NE to SW-oriented fault system in the Mesozoic cover of the Agourai Plateau. Despite the reliability of this approach, some folded basaltic sills occurring in this region were not well detected, probably because of their reduced thickness

Geoquímica de REE aplicada al estudio genético de la fluorita en el distrito minero de El Hammam (Marruecos Central)

The macroscopic and geochemical investigations of REE in fluorites of the mining district of El Hammam reveal several types of fluorite: green massive fluorite (FV type A), green brecciated fluorite (FV type B), white fluorite (FBl) and blue fluorite shaded in yellow (FBj). All these fluorites seem crystallized into four stages that have occurred over time. Thinks to its high REE content, FV type A is the oldest. This is followed by FV type B, FBl, and finally FBj, which are inceasingly depleted in REE. The FV type A and FV type B are attributed to magmatic fluids, associated with lamprophyres and monzogranites respectively. The other fluorites (FBl and FBj) are generated mainly by the remobilization of the green fluorites (FV type A&B), and associated with interaction of magmatic and surficial fluids with the sedimentary and/or metamorphic host rocks. The footprint of basinal fluids becomes increasingly evident when comparing the FBl to FBjLa investigación macroscópica y geoquímica de REE en fluoritas del distrito minero de El Hammam revelan varios tipos de fluorita: fluorita verde masiva (FVtipoA), brechas verdes de fluorita (FVtipoB), blanco de fluorita (FBl) y fluorita azul sombreada en amarillo (FBj). Todas estas fluoritas aparecen cristalizadas en cuatro etapas que se han sucedido en el tiempo. Debido a su contenido de alta REE, FV tipo A puede interpretarse como la más antigua. Esta etapa se continúa con FV tipo B, FBl, y finalmente FBj progresivamente empobrecidas en REE. La FV tipo A y FV tipo B se atribuyen a los fluidos magmáticos, así como diques de lamprófido y monzogranito respectivamente. Las otras fluoritas (FBL y FBj) se generan principalmente por la removilización de las fluoritas verdes (FV tipo A y B), resultante de la interacción de fluidos magmáticos con agua meteórica en relación con las rocas sedimentarias y/o metamórficas del encajante. La impronta de estos fluidos de cuenca se hace cada vez más evidente cuando se compara FBl y FB