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Erschienen in:
2005 | OriginalPaper | Buchkapitel
Chemical and mineralogical characteristics of tourmaline in pegmatites from Vavdos, Chalkidiki peninsula, N Greece
verfasst von : M. D. Laskou
Erschienen in: Mineral Deposit Research: Meeting the Global Challenge
Verlag: Springer Berlin Heidelberg
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Pegmatite veins crosscutting dunites and serpentinites of the ophiolitic complex of the Vavdos (Gioldaki and Loukoviti), northern Greece contain tourmalines with a wide variation in size and composition. Pegmatite veins mainly consist of quartz crystals, microcline, albite, perthitised-feldspars. The accessory minerals include mostly coarse to medium grained zoned tourmaline, and lesser amounts of sericite (only occasionally biotite). There are also trace amounts of some rare earth element minerals, such as morazite, xenotime and minerals of the bastnaesite group (epigenetic products of monazite). The pegmative veins host also fine-grained tourmalile, which shows an orientation parallel to the schistosity of the rock. They are composed of quartz, low-T albite and K-feldspars. Hydroxy apatite, chlorite, Nb-bearing REE minerals (koragoite), garnet, zircon and talc are also present in lesser amounts.