Quartz forming conditions in secant veins in granodiorites of the Andean intrusive complex of the Barchans Islands (Аrgentine Islands, West Antarctic)

• Main Authors: Naumko, I.М., Artemenko, G.V., Bakhmutov, V.G., Vovk, O.P., Теlepko, L.F., Sakhno, B.E.
• Format: Article
• Language: English
• Published: Видавничий дім "Академперіодика" НАН України 2018
• Series: Доповіді НАН України
• Subjects: Науки про Землю
• Online Access: http://dspace.nbuv.gov.ua/handle/123456789/141148

It is established that the growth of quartz in veins in granodiorites of the Andean intrusive complex (the Barchans Islands, West Antarctic) happened in rock crystalbearing veins of steep falling, in which the temperature difference necessary for the dissolution of massive quartz and crystallization of its transparent variety in the shape of perfectly cut crystals in central parts of secant veins was reached. The discovered enrichment of the fluid medium of the quartz crystallization with СО₂, NaCl, and ÊCl indicates a carbonatehaloid composition of quartzforming fluids, which favoured the formation of jewelry and technologically perfect crystals, possibly having piezoelectric properties similar to crystals of quartz both from rockcrystalbearing veins of the Nearpolar Ural and those synthesized under laboratory conditions. As a conclusion, the connection of quartzforming fluids and the postmagmatic processes in a granodiorite intrusion is justified, and the view of investigated quartz veins as formations of posttectonic hydrothermal stage is confirmed and expanded.