[ UTILISATION ET APPORT DE LA GEOCHIMIE DES CHAPEAUX DE FER EN PROSPECTION DES AMAS SULFURES : CAS DU GISEMENT DE KOUDIAT AICHA DANS LES JEBILETS CENTRALES - MAROC ]
Volume 24, Issue 2, September 2018, Pages 511–533
Fouad Lotfi1 and S. Brunet2
1 Université Ibn Zohr, Faculté Polydisciplinaire de Taroudant, Hay El Mohammadi (Lastah), B.P : 271, 83 000 Taroudant, Morocco
2 Managen, Casablanca, Morocco
Original language: French
Copyright © 2018 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The central Jebilets located to the south west of the Moroccan meseta represent a metalliferous province containing numerous deposits and massive sulphide index, of which the Koudiat Aïcha deposit is one of them. This last enclosed in the series of Saghlef attributed to the upper visean. It is predominantly pyrrhotite, contains minerals of the base metals such as sphalerite, galena, chalcopyrite, arsenopyrite and some traces of stannite. The orebody is enclosed in argillites interspersed with gabbroic magmatic sills at the footwall and hanging wall of the mineralization. It is materialized on the surface by the development of a gossan with iron oxides and hydroxides (hematite, magnetite, goethite, limonite, malachite ...), and shows an NS orientation according to the direction of the orebody. This study intersted with the search for distinctive criteria between gossan assigned to mineralization of economic interest in relation to massive sulphide and those developed on iron deposits or other non-economic iron indices near the sector of Koudiat Aïcha. This approach has made it possible to identify criteria that make it possible to distinguish the gossan of products directly from polymetallic base metal mineralization. The elements analyzed, such as Ag, As, Bi and Sn, in addition to the elements searched, made it possible to identify the gossan directly assigned to the Koudiat Aïcha deposit and to pinpoint its location. The results obtained are in good agreement with the data of the magnetic and gravimetric studies realized in carried out around the area of Koudiat Aïcha deposit. These results can be applied to all the ferruginous indices near the sector of Koudiat Aïcha in the Central Jebilet, see its extrapolation towards all the Hercynian lands.
Author Keywords: Central Jebilet, Koudiat Aïcha, Gossan de fer, exploration base, metal.
Volume 24, Issue 2, September 2018, Pages 511–533
Fouad Lotfi1 and S. Brunet2
1 Université Ibn Zohr, Faculté Polydisciplinaire de Taroudant, Hay El Mohammadi (Lastah), B.P : 271, 83 000 Taroudant, Morocco
2 Managen, Casablanca, Morocco
Original language: French
Copyright © 2018 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The central Jebilets located to the south west of the Moroccan meseta represent a metalliferous province containing numerous deposits and massive sulphide index, of which the Koudiat Aïcha deposit is one of them. This last enclosed in the series of Saghlef attributed to the upper visean. It is predominantly pyrrhotite, contains minerals of the base metals such as sphalerite, galena, chalcopyrite, arsenopyrite and some traces of stannite. The orebody is enclosed in argillites interspersed with gabbroic magmatic sills at the footwall and hanging wall of the mineralization. It is materialized on the surface by the development of a gossan with iron oxides and hydroxides (hematite, magnetite, goethite, limonite, malachite ...), and shows an NS orientation according to the direction of the orebody. This study intersted with the search for distinctive criteria between gossan assigned to mineralization of economic interest in relation to massive sulphide and those developed on iron deposits or other non-economic iron indices near the sector of Koudiat Aïcha. This approach has made it possible to identify criteria that make it possible to distinguish the gossan of products directly from polymetallic base metal mineralization. The elements analyzed, such as Ag, As, Bi and Sn, in addition to the elements searched, made it possible to identify the gossan directly assigned to the Koudiat Aïcha deposit and to pinpoint its location. The results obtained are in good agreement with the data of the magnetic and gravimetric studies realized in carried out around the area of Koudiat Aïcha deposit. These results can be applied to all the ferruginous indices near the sector of Koudiat Aïcha in the Central Jebilet, see its extrapolation towards all the Hercynian lands.
Author Keywords: Central Jebilet, Koudiat Aïcha, Gossan de fer, exploration base, metal.
Abstract: (french)
Les Jebilet centrales situées au sud-ouest de la meseta marocaine représentent une province métallifère renfermant de nombreux gisements et indice à sulfures massifs dont le gisement de Koudiat Aïcha en fait partie. Ce dernier encaissé dans la série de Saghlef attribué au visé en supérieur. Il est à prédominance de pyrrhotite, renferme des minéraux des métaux de base tels que la sphalérite, la galène, la chalcopyrite, l’arsénopyrite et quelques traces de stannite. Le corps minéralisé est encaissé au sein d’argilites intercalées par des sills magmatiques gabbroïques au toit et au mur de la minéralisation. Il est matérialisé en surface par le développement d’un chapeau de fer à oxydes et hydroxydes de fer (hématite, magnétite, goethite, limonite, malachite…), et montre une orientation NS selon la direction du corps minéralisé. Cette étude porte sur la recherche des critères distinctifs entre les chapeaux de fer liés à des minéralisations d’intérêt économique en relation avec les amas sulfurés et ceux développés sur des gîtes ferrifères ou autres indices ferrifères non économiques avoisinant le secteur de Koudiat Aïcha. Cette approche a permis de mettre en évidence des critères permettant de distinguer les chapeaux de fer liés directement à la minéralisation polymétallique à métaux de base. Les éléments analysés tel que Ag, As, Bi et Sn en plus des éléments recherchés, ont permis de bien identifier les chapeaux de fer liés directement au gisement de Koudiat Aïcha, et de bien cerner son emplacement. Les résultats obtenus sont en bonne concordance aux résultats des études magnétiques et gravimétriques réalisées dans le secteur. Ces résultats peuvent être appliqués sur l’ensemble des indices ferrugineux avoisinant le secteur de Koudiat Aïcha dans les Jebilet centrales voir son extrapolation vers l’ensemble des terrains hercyniens.
Author Keywords: Jebilet centrales, Koudiat Aïcha, chapeau de fer, exploration, métaux de base.
How to Cite this Article
Fouad Lotfi and S. Brunet, “USE AND CONTRIBUTION OF THE GEOCHEMISTRY OF GOSSAN TO THE PROSPECTING FOR MASSIVE SULPHIDE DEPOSIT : CASE OF THE KOUDIAT AICHA DEPOSIT IN CENTRAL JEBILET - MOROCCO,” International Journal of Innovation and Applied Studies, vol. 24, no. 2, pp. 511–533, September 2018.
