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Electron backscatter diffraction-based identification and quantification of diamonds from the rif gneisses (Spain and Morocco) / María Dolores Ruiz Cruz in Economic geology, Vol. 106 N° 7 (Novembre 2011) 

Public ISBD [article]  in Economic geology > Vol. 106 N° 7 (Novembre 2011) . - pp. 1241-1249 Titre : Electron backscatter diffraction-based identification and quantification of diamonds from the rif gneisses (Spain and Morocco) : economic implication Type de document : texte imprimé Auteurs : María Dolores Ruiz Cruz, Auteur ; de Galdeano, Carlos Sanz, Auteur ; Carmen Garrido, Auteur Année de publication : 2011 Article en page(s) : pp. 1241-1249 Note générale : Economic geology Langues : Anglais (eng) Mots-clés : Electron  Backscatter  Diamond  Spain  Morocco Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : Microdiamonds from granulite facies gneisses of the Northern Rif (Spain and Morocco) have been studied by electron backscatter diffraction (EBSD). Diamond identification using other techniques, such as Raman spectroscopy, is hindered by microdiamond size and by the presence of graphite bands. In contrast, EBSD enabled the following: (1) the rapid identification of diamonds and their distribution, (2) the estimate of the diamond concentration, and (3) the analysis of the crystallographic relationships between diamonds and the surrounding phases. EBSD study has revealed that (1) diamonds are concentrated mainly in large mesoperthite and quartz + coesite grains, (2) the diamond concentration in the rocks is notably higher than that estimated on the basis of diamond concentration in garnet, and (3) clear orientation relationships exist among diamonds, coesite, and quartz. These data would not have been revealed using classical methods, since most diamonds can be recognized by optical microscopy only when EBSD maps have previously revealed their location. The high diamond grades determined in this preliminary study suggest that these deposits could be of economic interest. DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/106/7/1241.abstract [article] Electron backscatter diffraction-based identification and quantification of diamonds from the rif gneisses (Spain and Morocco) : economic implication [texte imprimé] / María Dolores Ruiz Cruz, Auteur ; de Galdeano, Carlos Sanz, Auteur ; Carmen Garrido, Auteur . - 2011 . - pp. 1241-1249. Economic geology Langues : Anglais (eng) in Economic geology > Vol. 106 N° 7 (Novembre 2011) . - pp. 1241-1249 Mots-clés : Electron  Backscatter  Diamond  Spain  Morocco Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : Microdiamonds from granulite facies gneisses of the Northern Rif (Spain and Morocco) have been studied by electron backscatter diffraction (EBSD). Diamond identification using other techniques, such as Raman spectroscopy, is hindered by microdiamond size and by the presence of graphite bands. In contrast, EBSD enabled the following: (1) the rapid identification of diamonds and their distribution, (2) the estimate of the diamond concentration, and (3) the analysis of the crystallographic relationships between diamonds and the surrounding phases. EBSD study has revealed that (1) diamonds are concentrated mainly in large mesoperthite and quartz + coesite grains, (2) the diamond concentration in the rocks is notably higher than that estimated on the basis of diamond concentration in garnet, and (3) clear orientation relationships exist among diamonds, coesite, and quartz. These data would not have been revealed using classical methods, since most diamonds can be recognized by optical microscopy only when EBSD maps have previously revealed their location. The high diamond grades determined in this preliminary study suggest that these deposits could be of economic interest. DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/106/7/1241.abstract