Место издания: Новосибирск , Год издания: 1992

Inclusions in honeycomb quartzes of chambered pegmatites from Volyn' (Korosten' pluton), chambered pegmatites of the Kent granite pluton (Central Kazakhstan), and miarolitic pegmatites of Zolotaya Mountain (Borshchevskii Ridge, Eastern Transbaikalia) have been investigated. Chromatographic analysis showed that the gas phase released from quartz of Volyn' to 600 degrees-C contains H20 (about 70 wt.%) and CO₂ (25%). The rest is CO and trace amounts of CH4, H2S, SO2. According to results of Raman spectroscopy, the gas phase in inclusions of the all three types consists, mainly, of CO₂ (more than 90%) and negligible amounts of N2 and H2. Freezing stage was used to determine salt composition and content of CO₂. The measured melting temperature of carbon dioxide is close to standard value (-56,6 degrees-C). Carbon dioxide in quartz inclusions from Kent does not freeze because of low content. Quartzes from Volyn' occupy an intermediate state. The main salt components in inclusions are NaCl and NaHCO3. To determine the concentrations of salt solutions in inclusions, the results of cryoscopy were compared with reference diagrams of solubility and fugacity of water-salt systems. Homogenization temperatures of inclusions were measured to specify the tendencies of accumulation of salts in solutions, which boil away from pegmatite melts.