SIGNS AND PROOFS OF THE QUARTZ FORMATION FROM SILICA GEL IN THE GOLD-BEARING VEINS OF BEREHOVE ORE FIELD (TRANSCARPATHIANS)
Keywords:
quartz veins, cathodoluminescence, silica gel, Berehove ore field.Abstract
Swingeing majority of the quartz and sulphide-quartz gold-bearing bodies in the epithermal deposits of the Berehove ore field (Transcarpathians, Ukraine) do not carry a structure of succes-sive growth from the walls to the vein centre. The general structural pattern of these veins is usu-ally a homogeneous cryptocrystalline and fine-crystalline quartz array with much less volume percent of druses amount. We attributed these remarkable features to their metasomatic deriva-tion. Hydrothermal quartz from the gold-bearing quartz veins has been analyzed by scanning electron microscope-cathodoluminescence (SEM-CL). The textural features of quartz veins have been described with the emphasis placed upon the mineral relationship, a crystallization se-quence, and mainly an inner structure of quartz. Cathodoluminescence imagery revealed numer-ous unique patterns and helped to determine and interpret physical and chemical processes of the mineral forming. There are evidences of an colloidal origin most of the quartz array. Cryptocrys-talline quartz varieties were formed from a silica gel, whereas coarse-crystalline drusy quartz pre-cipitated from solutides. The vein textures of most ore bodies indicate that quartz was formed by metasomatism in the disperse medium, whereas quartz from the sixth ore zone was precipitated from solutides in condition of a crack opening.
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