Petrography and crystallization conditions of the Pelitli Pluton in the Bayburt area, Eastern Pontides (NE Turkey)
Keywords:
mineralogy-petrography, mineral chemistry, geothermobarometer, pelitli pluton, eastern pontides, bayburt
Abstract
In this study, the mineralogy, petrography and mineral chemistry of the Middle Eocene Pelitli pluton located to the north of Bayburt are determined, and the crystallisation conditions of the studied pluton were estimated by means of thermobarometer calculations. The main units in the study area are the Eocene Yazyurdu Formation, which are consists of basalt, andesite and minor dacite lavas and their pyroclastic equivalents, intercalated with siltstone, sandstone, marl and limestone. All these units were intruded by the Middle Eocene Pelitli Pluton. Quaternary alluviums form the youngest rocks of the study area. The Pelitli Pluton extend mostly in NE-SW directions and are approximately ellipsoid in shape. This pluton is diorite, tonalite, granodiorite and granite in composition and the main minerals are plagioclase, orthoclase, quartz, hornblende, biotite, pyroxene and Fe-Ti oxides. The rocks of pluton have fine to medium granular, porphyric, monzonitic, poikilitic, occasionally myrmekitic and micrographic textures. Plagioclases are labradorite to albite in composition (An60-02). K-feldispare are orthoclase in composition (Or90-79). Pyroxenes are diopside and augite in composition (Wo46-41En44-39Fs16-14) and the Mg-number varies from 0.72 to 0.76. Hornblende displays a narrow compositional range (Mg# = 0.73-0.93) and are magnesio-hornblende in composition. Biotites are magnesium-rich (Mg# = 0.56-0.62). Crystallization temperatures calculated from amphibole-plagioclase and clinopyroxene minerals are 666 °C to 1161 °C and pressure values are 0.1 to 2.7 kbar. Based on the obtained data, it is suggested that the studied Pelitli Pluton was emplaced at shallow depths (~ 1 to 8 km).
References
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[16] Boztuğ, D., Erçin, A.İ., Kuruçelik, M.K., Göç, D., Kömür, İ., İskenderoğlu, A. Geochemical characteristics of the composite Kaçkar batholith generated in a Neo-Tethyan convergence system, Eastem Pontides, Turkey, Journal of Asian Earth Sciences 2006; 27: 286–302.
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[18] Karslı, O., Dokuz, A., Uysal, I., Aydin, F., Bin, C., Kandemir, R., Wijbrans, R.J. Relative contributions of crust and mantle to generation of Campanian high-K calc-alkaline I-type granitoids in a subdution setting, with special reference to the Harşit pluton, Eastern Turkey. Contributions to Mineralogy and Petrology 2010; 160: 467-487.
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Published
2021-06-30
How to Cite
Cakmak, G., & Kaygusuz, A. (2021). Petrography and crystallization conditions of the Pelitli Pluton in the Bayburt area, Eastern Pontides (NE Turkey). Journal of Engineering Research and Applied Science, 10(1), 1658-1669. Retrieved from http://www.journaleras.com/index.php/jeras/article/view/231
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