Petrography and crystallization conditions of Middle Eocene volcanic rocks in the Aydintepe-Yazyurdu (Bayburt) area, Eastern Pontides (NE Turkey)
Keywords:
mineralogy-petrography, geothermobarometer, Middle Eocene, Aydıntepe-Yazyurdu volcanics, Eastern Pontides, Bayburt, NE Turkey
Abstract
Mineralogical, petrographic and mineral chemistry properties are presented for the Middle Eocene aged Aydintepe-Yazyurdu volcanics in the Eastern Pontides (NE Turkey). The studied volcanic rocks are composed of basalt, basaltic andesite, andesite and dacite and their pyroclastic. These rocks contain plagioclase (An39-86), alkali feldspar, quartz, clino-pyroxene (Wo38-48En38-46Fs9-23), ortho-pyroxene (Wo02-03En71-73Fs25-26), amphibole (Mg# = 0.68-0.79), biotite and Fe-Ti oxide minerals. Crystallization temperatures calculated from amphibole-plagioclase and clinopyroxene minerals are 819 °C to 1157 °C, pressure values are 0.14 to 7.79 kbar. Oxygen fugacity (log10 ƒO2) are -11.0 to -12.1 and estimation of water content is between 3.9 and 5.9% calculated by using amphiboles. Based on the obtained data, it is suggested that the magmas had undergone anhydrous and hydrous crystallizations in the shallow to mid-crustal magma chambers.
References
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[16] Topuz, G., Altherr, R., Wolfgang, S., Schwarz, W.H., Zack, T., Hasanözbek, A., Mathias, B,. Satır, M., Şen, C. Carboniferous high-potassium I-type granitoid magmatism in the Eastern Pontides: The Gümüşhane Pluton (NE Turkey). Lithos 2010; 116: 92-110.
[17] Dokuz, A. A slab Detachment and delamination model for the generation of Carboniferous high-potassium i-type magmatism in the Eastern Pontides, NE Turkey: Köse Composite Pluton. Godwana Research 2011; 19: 926-944.
[18] Kaygusuz, A., Arslan, M., Siebel, W., Sipahi, F., Ä°lbeyli, N. Geochronological evidence and tectonic significance of Carboniferous magmatism in the southwest Trabzon area, eastern Pontides, Turkey. International Geology Rew 2012; 54 (15): 1776-1800.
[19] Kaygusuz, A., Arslan, M., Sipahi, F., Temizel, Ä°. U-Pb zircon chronology and petrogenesis of Carboniferous plutons in the northern part of the Eastern Pontides, NE Turkey: Constraints for Paleozoic magmatism and geodynamic evolution. Gondwana Research 2016; 39: 327-346.
[20] Ağar, Ü. Demirözü (Bayburt) ve Köse (Kelkit) bölgesinin jeolojisi. Doktora Tezi. İstanbul Üniversitesi Fen Fakültesi 1997; 59 pp, İstanbul.
[21] Kandemir, R., Yılmaz, C. Lithostratigraphy, facies, and deposition environment of the lower Jurassic Ammonitico Rosso type sediments (Arts) in the Gümüşhane area, NE Turkey: Implications for the opening of the northern branch of the Neo-Tethys Ocean. Journal of Asian Earth Sciences 2009; 34: 586-598.
[22] Dokuz, A., Karslı, O., Chen, B., Uysal, İ. Sources and petrogenesis of Jurassic granitoids in the Yusufeli area, northeastern Turkey: implications for pre- and post-collisional lithospheric thinning of the Eastern Pontides. Tectonophysics 2010: 480: 259-279.
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[25] Karslı, O., Dokuz, A., Uysal, İ., Aydın, F., Kandemir, R., Wijbrans, J.R. Generation of the Early Cenozoic adakitic volcanism by partial melting of mafic lower crust, eastern Turkey: Implication for crustal thickening to delamination. Lithos 2010; 114: 109-120.
[26] Vural, A. K-Ar dating for determining the age of mineralization as alteration product: A case study of antimony mineralization vein type in granitic rocks of Gümüşhane area, Turkey. Acta Physisca Polonica A 2017; 132: 792-795.
[27] Aydınçakır, E. Subduction-related late cretaceous high-K volcanism in the Central Pontides orogenic belt: constraints on geodynamic implications. Geodinamica Acta 2016; 28(4): 379-411.
[28] Temizel, İ., Arslan, M., Yücel, C., Abdioğlu Yazar, E., Kaygusuz, A., Aslan, Z. U-Pb geochronology, bulk-rock geochemistry and petrology of Late Cretaceous syenitic plutons in the Gölköy (Ordu) area (NE Turkey): Implications for magma generation in a continental arc extension triggered by slab roll-back. Journal of Asian Earth Sciences 2019a; 171: 305-320.
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Published
2019-12-31
How to Cite
Kaygusuz, A., Gucer, M. A., Yucel, C., Aydincakir, E., & Sipahi, F. (2019). Petrography and crystallization conditions of Middle Eocene volcanic rocks in the Aydintepe-Yazyurdu (Bayburt) area, Eastern Pontides (NE Turkey). Journal of Engineering Research and Applied Science, 8(2), 1205-1215. Retrieved from http://www.journaleras.com/index.php/jeras/article/view/176
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