Mineralogical and Petrographic Properties of Beytarla-Kazıkbeli, Taşbaşı, Yaylaköy-Söğüteli Plutons Located to the South of Giresun (Eastern Pontides, Turkey)
Abstract
The Esatern Pontides comprises of many plutons varying in size, composition and ages from Paleozoic to Tertiary. Those of especially the Late Cretaceous aged ones from these plutonic rocks are commonly observed in the northern part, while the Eocene aged ones are common in the southern part of the Eastern Pontides. In this study, the mineralogic and petrographic properties of the Beytarla-Kazıkbeli, Taşbaşı, Yaylaköy-Söğüteli plutons located to the south of Giresun (NE Turkey) were revealed. The studied plutons mostly extend NE-SW directions and usually contain mafic microgranular enclaves (MMEs) with different size. Petrographically, the rocks of the plutons are not uniform and show variations in both colour and mineralogical content. According to modal mineralogies, these plutonic rocks are gabbroic diorite, diorit, granodiorite, tonalite and monzogranite in composition. The mineralogical assemblage of the plutonic rocks is plagioclase + quartz + K-feldispar + amphibole + biotite + Fe-Ti oxide minerals. They have fine to medium granular, monzonitic, porphyric, poikilitic, micrographic and myrmekitic textures. The ellipse shapes of plutons, the contact relationship with the wall-rocks, xenolith contents and some textural features show that the studied plutons were emplaced at shallow depths of the crust.
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