Emplacement conditions of magma(s) forming Jurassic plutonic rocks in Gümüşhane (Eastern Pontides, Turkey)

Yıl 2020, Cilt: 162 Sayı: 162, 175 - 196, 15.08.2020

Emre Aydınçakır , Ramazan Gündüz Cem Yücel

https://doi.org/10.19111/bulletinofmre.649808

Cited By: 3

Öz

In this study, the petrography, mineral chemistry and crystallization conditions were reported for the Alemdar and Işıkdere plutons located in limited areas in the south of the Eastern Pontides. These plutons, which trend mostly in NE-SW directions, were emplaced by cutting the Early- Middle Carboniferous-aged Gümüşhane Granitoid and Early-Middle Jurassic Şenköy formation. Petrographically, the studied plutons are compositionally fine to medium grained quartz-diorite, quartz monzodiorite and tonalite. The rocks in the plutons have granular, poikilitic, monzonitic, graphic and rare porphyritic textures with consist of plagioclase, (An05-92), hornblende (Mg# = 0.52- 0.81), biotite (Mg# = 0.32-0.67), orthoclase, quartz and Fe-Ti oxide. According to thermobarometric calculations, plutons have crystallization temperatures, pressures and oxygen fugacity values ranging from 541°C to 938°C, 0.1 to 4.4 kbar, and -23 to-12, respectively. The estimated water content calculated from amphibole is between 4.4 to 7.8%. It can be concluded that the studied plutons were emplaced at mid to shallow crustal depths (~4-15 km).

Anahtar Kelimeler

Mineral chemistry, Geothermobarometer, Jurassic magmatism, Eastern Pontides, Gümüşhane, Turkey

Teşekkür

This study was supported by Gümüşhane University Scientific Research Projects Coordinatorship (Project No: 17.F5114.01.01). The authors thank to İrfan Temizel and Fatma Toksoy Köksal for their constructive criticism and opinions about the manuscript.

Kaynakça

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