Abstract
Determination of H 2O, CO 2, CO, CH 4, H 2 and N 2 in quartz samples from the Bestube gold deposit and the Kara-Oba tungsten deposit was carried out by gas chromatography. In the Kara-Oba deposit the near-vein greisens were also sampled. The quartz samples from gold ore deposits show considerably higher H 2O contents and lower contents of all other gases compared to those of tungsten deposits. Gold-bearing ore deposits are characterized by high contents of reduced H 2, CO and CH 4 which are highest around ore shoots and rich ore concentrations, thus reflecting the reducing environment of gold deposits. In tungsten deposits, the wolframite accumulations are surrounded by H 2O haloes and negative anomalies of reduced gases which indicate relatively oxidizing conditions for ore deposition. Both types of deposit show a typical increase in H 2, CO and CH 4 with depth which may be used to evaluate the erosion level of veins.
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