VOLATILE COMPONENTS IN CORDIERITE AND COEXISTING TOURMALINE AND QUARTZ FROM PEGMATITES OF THE KUHILAL DEPOSIT (Pamir, Tajikistan)
K.I. Zatolokina, A.A. Tomilenko, T.A. Bul’bak, G.G. Lepezin
V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
Keywords: Pegmatites, cordierite, tourmaline, fluid components, pyrolysis-free gas chromatography-mass spectrometry (GC-MS), IR and Raman spectroscopy, Kuhilal deposit
Abstract
The compositions of volatile components in cordierite, tourmaline, and quartz from pegmatites of the Kuhilal deposit were studied by pyrolysis-free gas chromatography-mass spectrometry (GC-MS), IR and Raman spectroscopy, and microthermometry, and their comparative analysis was performed. Capillary GC-MS was applied to determine the component composition and relative contents (rel. %) of volatiles from different zones of crystals and fractions of cordierite. It has been established that water and carbon dioxide prevail among them. Hydrocarbons are predominantly aliphatic, cyclic, and oxygenated. Heterocyclic, nitrogenated, and sulfonated compounds are present in gas-liquid inclusions in tourmaline and quartz, and volatile components are localized in both structural cavities and nonstructural positions in cordierites.
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