H+ and Li+ Charge Compensator Ions in Structural Channels of Quartz from Gold Deposits of the Darasun Gold Ore Field (Eastern Transbaikalia, Russia): Electron Paramagnetic Resonance Data

Аннотация

Electron paramagnetic resonance (EPR) is used to study the composition and diffusion mobility of charge compensator ions in structural channels of quartz from the Darasun, Teremkinskoe, and Talatui gold fields of the Darasun ore field. The ion distribution features in quartz are evaluated based on their ability to participate in neutralizing the electrical charge of structural defects occurring in quartz. In accordance with this, the ion composition was assessed from the ratio of concentrations of Ti centers with different charge compensator ions, and their mobility was determined based on the formation rate of these centers under irradiation of quartz. The research shows the presence of two main types of charge compensator ions, H⁺ and Li⁺, in structural channels of quartz from the Darasun ore field. It was found that the diffusion mobility of H⁺ ions in channels are one to two orders of magnitude higher than that of Li⁺. There is no correlation between the composition of charge compensator ions and the fluid composition. Different ratios between concentrations of H⁺ and Li⁺ ions in structural channels of quartz from different deposits were established. The maximum concentrations of H⁺ ions and the minimum concentrations of Li⁺ ions are recorded in quartz from the Darasun ore field, and an inverse relation was recorded in quartz from the Talatui deposit. This can be explained by the migration of the gas component of fluid during ore genesis. It was shown that EPR can be applicable to quantitatively estimate the degree of dynamic recrystallization of quartz.