Petrographical, Geochemical and Petrological Characteristics of the Mafic Microgranular Enclaves in the Arpaköy (Kürtün/Gümüşhane) Granitoid
Abstract
In this study, mineralogical-petrographical composition and whole-rock geochemical characteristics of the mafik microgranular enclaves (MMEs) in Arpaköy Granitoid in the Kürtün (Gümüşhane) area were determined, and the evolution and origin of the MMEs were investigated. The studied mafic microgranular enclaves (MMEs) are observed in Late Cretaceous Arpaköy Granitoid. Although these MMEs are finer grained and darker coloured than their host rocks, they aslo show similar mineralogic, petrographic and geochemical properties. The studied MMEs are gabroic diorite in composition, and composed of plagioclase (An65-41), quartz, ortoclase, amphibole (Mg#=0.63-0.70), pyroxene and Fe-Ti oxides. Geochemically, the mafic microgranular enclaves (MMEs) has medium to high-K calc-alkaline and metaluminous characters and show similar geochemical characters to the host plutonic rocks. The MMEs are enriched in LILE and HREE, and show a concordant trend with the host rocks. Chondrite normalized REE patterns are concave shaped (LaN/YbN=7.11-11.57) and show negative Eu-anomalies (EuN/Eu*=0.37-0.91). The crystallization temperatures calculated according to apatite and zircon are between 647 °C and 836 °C. When petrographic, geochemical and geothermometer studies are evaluated together, it is understood that the MMEs represent products of small masses during mixing/mingling processes of mafic parental magma of the host pluton in the crustal magma chamber.
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