Petrography, Mineral Chemistry and Crystallization Conditions of Oligocene Aged Alabalik Volcanics (Oltu-Erzurum, NE Turkey)
Keywords:
Mineral chemistry, geothermobarometer, Alabalik volcanic, Oltu, NE Turkey
Abstract
In this study, mineralogical, petrographic, and mineral chemistry analyses of Oligocene-aged Alabalik volcanic rocks (Oltu/Erzurum) in the Eastern Pontides (NE, Turkiye) were revealed. The studied volcanic rocks consist of andesitic, dacitic, and pyroclastic. These rocks consist of plagioclase (An15-44), hornblende (Mg# = 0,632-0,80), biotite (Mg# = 0,62-0,657), augite (Wo44En42Fs15), and Fe-Ti oxide minerals. They generally exhibit hyalomicrolytic porphyritic, glomera porphyritic, cumulative porphyritic, microlitic porphyritic, poikilitic and intersertal textures. In the studied rocks, disequilibrium textures are observed such as oscillatory zoning, sieve texture and corrosion in plagioclase phenocrysts, and resorbed cores and mantles, rounded crytals, and embayed rims in clinopyroxenes. According to thermobarometric calculations, the crystallization temperatures, pressures and oxygen fugacity values of the studied volcanic rocks range from 800 oC to 1027 oC, 0.7 to 8.8 kbar, and -15.2 to -9.0, respectively. The amphibole-derived estimated water content in the studied volcanic rocks vary from 2.6 to 8.2%. Al these features suggests that the magmas that forms the studied volcanic rocks had undergone hydrous crystallizations in the shallow to mid-crustal magma chambers.
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[14] Dokuz A, Uysal İ, Meisel W, Turan M, Duncan R, Akçay M. Post-collisional adakitic volcanism in the eastern part of the Sakarya Zone, Turkey: evidence for slab and crustal melting. Contributions to Mineralogy and Petrology 2013; 166:1443–1468.
[15] Aydın F. 2014. Geochronology, geochemistry, and petrogenesis of the Maçka subvolcanic intrusions: implications for the late Cretaceous magmatic and geodynamic evolution of the eastern part of the Sakarya zone, northeastern Turkey. International Geology Review 2014; 56:1246-1275.
[16] Boztuğ D, Jonckheere RC, Wagner GA, Yeğingil Z. Slow Senonian and fast Palaeocene–Early Eocene uplift of the granitoids in the central eastern Pontides, Turkey: Apatite fission-track results: Tectonophysics 2004; 382(3–4):213–228.
[17] Şengör AMC, Özeren S, Genç T, Zor E. East Anatolian High Plateau As A Mantlesupported, North–south Shortened Domal Structure. Geophysical Research Letters 2003; 30(24):8045.
[18] Topuz G, Altherr R, Kalt A, Satir M, Werner O, Schwarz WH. Aluminous granulites from the Pulur complex NE Turkey: a Case of Partial Melting, Efficient Melt Extraction and Crystallization. Lithos 2004; 72:183–207.
[19] Topuz G, Altherr R, Schwarz WH, Dokuz A, Meyer HP. Variscan amphibolite-facies rocks from the Kurtoğlu metamorphic complex (Gümüşhane area, Eastern Pontides, Turkey): International Journal of Earth Sciences 2007; 96(5):861–873.
[20] Okay AI, Satır M, Siebel W. Pre-Alpide Palaeozoic and Mesozoic orogenic events in the Eastern Mediterranean region. In: Gee, D.G., Stephenson, R.A. (Eds.), European Lithosphere Dynamics. Geological Society, London, Memoirs 2006; 32:389–405.
[21] Dokuz A, Uysal İ, Kaliwoda M, Karslı O, Ottley CJ, Kandemir R. Early abyssal- and late SSZ-type vestiges of the Rheic oceanic mantle in the Variscan basement of the Sakarya Zone, NE Turkey: implications for the sense of subduction and opening of the Paleotethys. Lithos 2011; 127:176–191.
[22] Çoğulu E. Gümüşhane ve Rize granitik plutonlarının mukayeseli petrojeolojik ve jeokronolojik etüdü. Unpubl Diss Thesis, İstanbul Tech Univ 1975.
[23] Topuz G, Altherr R, Siebel W, Schwarz WH, Zack T, Hasözbek A, Barth M, 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.
[24] Kaygusuz A, Arslan M, Wolfgang S, Sipahi F, İlbeyli N. Geochronological evidence and tectonic signifi cance of Carboniferous magmatism in the southwest Trabzon area, eastern Pontides, Turkey. International Geology Review 2012; 54(15):1776–1800.
[25] Kaygusuz A, Arslan M, Sipahi F, Temizel İ. 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.
[26] Karslı O, Dokuz A, Kandemir R. Subduction-related Late Carboniferous to Early Permian Magmatism in the Eastern Pontides, the Camlik and Casurluk plutons: Insights from geochemistry, whole-rock Sr–Nd and in situ zircon Lu–Hf isotopes, and U–Pb geochronology. Lithos 2016; 266–267:98–114.
[27] Dokuz A, Külekçi E, Aydınçakır E, Kandemir R, Alçiçek MC, Pecha ME, Sünnetçi K. Cordierite-bearing strongly peraluminous Cebre Rhyolite from the eastern Sakarya Zone, NE Turkey: Constraints on the Variscan Orogeny. Lithos 2017a; 278–281:285–302.
[28] Okay Aİ, Leven EJ. Stratigraphy and paleontology of the upper Paleozoic sequences in the Pulur (Bayburt) region, Eastern Pontides. Turkish Journal of Earth Sciences 1996; 5:145-155.
[29] Kandemir R, Lerosey-Aubril R. First report of a trilobite in the Carboniferous of Eastern Pontides, NE Turkey. Turkish Journal of Earth Sciences 2011; 20:179–183.
[30] Saydam Eker Ç, Sipahi F, Kaygusuz A. Trace and rare earth elements as indicators of provenance and depositional environments of Lias cherts in Gumushane, NE Turkey. Chemie der Erde Geochemistry 2012; 72:167–177.
[31] Dokuz A, Aydincakir E, Kandemir R, Karslı O, Siebel W, Derman AS, Turan M. Late Jurassic magmatism and stratigraphy in the eastern Sakarya Zone, Turkey: evidence for the slab breakoff of Paleotethyan oceanic lithosphere. Journal of Geology 2017b; 125: 1–31.
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Published
2023-12-31
How to Cite
Aydincakir, E. (2023). Petrography, Mineral Chemistry and Crystallization Conditions of Oligocene Aged Alabalik Volcanics (Oltu-Erzurum, NE Turkey). Journal of Engineering Research and Applied Science, 12(2), 2322-2336. Retrieved from http://www.journaleras.com/index.php/jeras/article/view/326
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