Hole paramagnetic centers in vein granular quartz from the Sakar Mountain in SE Bulgaria

Abstract

Electron paramagnetic resonance (EPR) study of 17 samples of granular vein quartz of a high chemical purity shows, that specific lines in the EPR spectra can be used for an express determination of different quartz grades for industrial purposes, as for genetic interpretations. A set of three hole centers with specific lines at g = 2.049, 2.034 and 2.022 has been considered as characteristic for this genetic quartz type. Quartz samples from granitoid host rocks have a higher intensity of EPR lines interpretated as a sum of concentration of hole centers compared to those samples from metamorphic host rocks. Contaminated contact quartz samples usually have a higher concentration of hole centers compared to samples from the center of the vein.