PLAGIOCLASE COMPOSITION ON THE VITOSHA PLUTON (BULGARIA) BY X-RAY MAPS
Iskra V. Piroeva, Stela V. Atanasova-Vladimirova, Bogdan S. Ranguelov
Pages: 169-176 Published: 2 Jun 2014
Views: 2,101 Downloads: 917
Abstract: Electron microscopy X-ray elemental analysis is used to characterize the plagioclase composition of the Vitosha pluton. The Vitosha pluton crops out in the western part of the Srednogorie structural zone. The plutonic body is composed of abyssal gabbros and anorthosites, hypoabyssal monzonites, syenites and late veins of granosyenitic composition. The major rock-forming mineral phases are plagioclase, K-feldspar, amphibole and clinopyroxene. Common accessory minerals include apatite, titanite, magnetite, ilmenite and zircon. Secondary minerals are epidote, tourmaline, chlorite, actinolite, adularia and clay minerals. Plagioclase crystals characterized by compositional zoning are typical of the Vitosha pluton.