Petrography, Mineral Chemistry, and Crystallization Conditions of the Eocene-aged Hasan Dag Plutons (Kurtun, Gumushane, NE Turkey)
Keywords:
Geothermobarometry; Petrography; Mineral chemistry; Eastern Pontides; Hasan Dağ Pluton
Abstract
The Eastern Pontides are home to a wide variety of plutonic rocks that vary greatly in composition and age. The Eocene Hasan Dağ Pluton, exposed around Kürtün in northeastern Turkey, stands out among them due to its distinctive petrographic and mineralogical characteristics. This study aims to determine the physicochemical conditions (temperature, pressure, and oxygen fugacity) under which the Kazıkbeli magma crystallized based on petrographic and mineralogical data. The Hasan Dağ pluton extends in an approximate NE–SW direction and covers an area of about 15 km². The studied rocks are fine- to medium-grained and primarily consist of granodiorite, tonalite, and diorite compositions. The plutonic rocks display granular, poikilitic, monzonitic, graphic, and, rarely, porphyritic textures. The main mineral assemblage includes plagioclase (An₁₄₋₅₆), hornblende (Mg# = 0.78–0.85), biotite, orthoclase, quartz, and Fe-Ti oxides. Thermobarometric calculations indicate crystallization temperatures of 636–1075 °C, pressures of 0.2–5.1 kbar, and oxygen fugacities (ƒO₂) ranging from −13 to −10. Water contents estimated from hornblende compositions range from 3.3 to 5.0 wt.%. These results suggest that the Hasan Dağ pluton crystallized and was emplaced at mid- to shallow crustal depths corresponding to approximately 3–12 km.
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Published
2025-12-31
How to Cite
Aydincakir, E., Kaygusuz, A., Yucel, C., Guloglu, Z. S., & Sen, A. D. (2025). Petrography, Mineral Chemistry, and Crystallization Conditions of the Eocene-aged Hasan Dag Plutons (Kurtun, Gumushane, NE Turkey). Journal of Engineering Research and Applied Science, 14(2), 234-249. Retrieved from https://journaleras.com/index.php/jeras/article/view/410
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