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Mineral chemistry, thermodynamic evolution, and crystallization history of late miocene volcanic rocks around posof (Ardahan, Türkiye)

Yıl 2025, Cilt: 31 Sayı: 8, 1469 - 1493, 17.12.2025

Derya Cicerali Cem Yücel , Emre Aydınçakır , Abdullah Kaygusuz

https://doi.org/10.65206/pajes.73473

Öz

This study aimed to constrain the crystallization and emplacement conditions of magmas that produced the Late Miocene volcanic rocks exposed at the junction of the Erzurum-Kars Plateau and the Eastern Pontides in the Northeastern Anatolia Region through a series of thermobarometric analyses. The volcanic succession unconformably overlies Oligocene mudstone, siltstone, and sandstone alternations, with limestone and cherty limestone at higher levels. Petrographically, they consist of fine- to coarse-grained basalt, basaltic andesite, and andesite. Mineral compositions include plagioclase (An16-77), clinopyroxene (Wo39-45En43-50Fs11-12), orthopyroxene (Wo3-4En73-82Fs14-24), olivine (Fo63-86), hornblende (Mg#=0.62-0.79), and Fe-Ti oxides (Usp0.05-1.44, Ilm94.10-95.53). The groundmass comprises microlites of these minerals and volcanic glass. The dominant textures are microlitic porphyritic, hyalo-microlitic, and microlitic porphyritic, while glomeroporphyritic, intergranular, pilotaxitic, subophitic, flow, and vesicular textures are also observed. Widely present disequilibrium features, such as zoning, sieve, and resorption, are common in plagioclase and clinopyroxene. Thermobarometric calculations indicate crystallization temperatures of 880-1230°C, pressures of 0.73-8.71 kbar, oxygen fugacities between (-10.94) and (-8.92), and water contents of 4.60-6.32 wt.%. These results suggest that the volcanic rocks crystallized under volatile-rich, oxidizing conditions across a broad depth range (~2-32 km), at relatively high temperatures.

Anahtar Kelimeler

Late Miocene Mineral Chemistry Geothermobarometer Disequilibrium Crystallization

Kaynakça

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Posof (Ardahan, Türkiye) civarindaki üst miyosen yaşli volkanik kayaçlarin mineral kimyasi, termodinamik gelişimi ve kristallenme tarihçesi

Yıl 2025, Cilt: 31 Sayı: 8, 1469 - 1493, 17.12.2025

Derya Cicerali Cem Yücel , Emre Aydınçakır , Abdullah Kaygusuz

https://doi.org/10.65206/pajes.73473

Öz

Bu çalışmada, Kuzeydoğu Anadolu Bölgesi’nde Erzurum-Kars Platosu ile Doğu Pontidler’in kesişim noktasında yüzeylenen Üst Miyosen yaşlı volkanik kayaçları oluşturan magmaların kristallenme ve yerleşim koşulları çeşitli termobarometrik hesaplamalar yardımıyla belirlenmiştir. Bu volkanikler Oligosen yaşlı kiltaşı, silttaşı ve kumtaşı ardalanması ile üst seviyelerinde kireçtaşı ve çörtlü kireçtaşlarından oluşan birim üzerine uyumsuz olarak yerleşir. Petrografik olarak; ince iri taneli bazalt, bazaltik andezit ve andezitlerden oluşurlar. Bu kayaçlar; plajiyoklaz (An16-77), klinopiroksen (Wo39-45En43-50Fs11-12), ortopiroksen (Wo3-4En73-82Fs14-24), olivin (Fo63-86), hornblend (Mg#0.62-0.79) ve Fe-Ti oksit (Usp0.05-1.44, İlm94.10-95.53) minerallerinden ibarettir. Kayaç hamuru tüm bu minerallerin mikrolitleri ve volkan camından meydana gelir. Mikrolitik porfirik, hyalo-mikrolitik ve mikrolitik porfirik doku genel dokuyu oluştururken, glomeroporfirik, intergranüler, pilotaksitik, subofitik, akma ve vesiküler dokular özel dokuları oluşturur. Plajiyoklaz ve klinopiroksenlerde gözlenen zonlanma, elek ve kemirilme dokuları dengesizlik dokulardır. Termobarometrik hesaplamalara göre volkanik kayaçların kristallenme sıcaklıkları 880-1230°C, basınçları 0.73-8.71 kbar, oksijen fugasitesi (-10.94) ile (-8.92) arasında ve su içeriği % 4.60-6.32 arasında değişmektedir. Sonuç olarak incelenen volkanik kayaçların; uçucularca zengin, yüksek oksidasyon koşullarında sığ ile derin kabuksal derinliklerde yüksek sıcaklıklarda (~2–32 km) oluştuğu söylenebilir.

Anahtar Kelimeler

Üst Miyosen Mineral Kimyası Jeotermobarometre Dengesiz Kristallenme Posof

Kaynakça

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  • [143] Blundy J, Cashman K, Humhreys M. “Magma heating by decompression-driven crystallization beneath andesite volcanoes”. Nature, 443, 76-80, 2006.
  • [144] Couch S, Sparks RSJ, Carroll MR. “Mineral disequilibriumin lavas explained by convective self-mixing in open magma chambers”. Nature, 411, 1037-1039, 2001.
  • [145] Wallace PJ, Carmichael ISE. “Petrology of volcan tequila, jalisco, Mexico: disequilibrium phenocryst assemblages and evolution of the subvolcanic magma system”. Contributions to Mineralogy and Petrology, 117, 345-361, 1994.
  • [146] Bedard JH. “Partitioning coefficients between olivine and sili cate melts”. Lithos, 83, 394-419, 2005.
  • [147] Batki A, Pál-Molnár E, Dobosi G, Skelton A. “Petrogenetic significance of ocellar camptonite dykes in the Ditrău Alkaline Massif, Romania”. Lithos, 200-201, 181-196, 2014.
  • [148] Codarcea A, Codarcea DM, Ianovici V. “Structura geologicǎ a masivului de roci alkaline de la Ditrǎu. Buletin Ştiinţific”, Secţia de Geologie şi GeografieII, (3-4), 385-446, 1957.
  • [149] Fall A, Bodnar RJ, Szabó Cs, Pál-Molnár E. “Fluid evolution in the nepheline sye nites of the Ditrău Alkaline Massif, Transylvania, Romania”. Lithos, 95, 331-345, 2007.
  • [150] Kräutner HG, Bindea G. “Timing of the Ditrău alkaline intrusive complex (Eastern Carpathians, Romania)”. Slovak Geological Magazine, 4, 213-221, 1998.
  • [151] Morogan V, Upton BGJ, Fitton JG. “The petrology of the Ditrău alkaline complex, Eastern Carpathians”. Mineralogy and Petrology, 69, 227-265, 2000.
  • [152] Pál-Molnár E. Hornblendites and Diorites of the DitrăuSyeniteMassif. Ed. Department of Mineralogy, Geochemistry and Petrology. University of Szeged, Szeged, 172 2000.
  • [153] Pál-Molnár E. Rock-forming minerals of the Ditrău Alkaline Massif. In: Szakáll, S., Kristály, F. (Eds.), Mineralogy of Székelyland, Eastern Transylvania, Romania”. Ed. Csík County Nature and Conservations Society, Sfântu Gheorghe-Miercurea-Ciuc-Târgu Mureș, 63-88, 2010(b).
  • [154] Pál-Molnár E, Batki A, Almási E, Kiss B, Upton BGJ, Markl G, Odling N. “Origin of mafic and ultramafic cumulates from the Ditrău Alkaline Massif, Romania”. Lithos, 239, 1-18, 2015(b).
  • [155] Pál-Molnár E, Árva-Sós E. “K/Ar radiometric dating on rocks from the northern part of the Ditrău Syenite Massif and its petrogenetic implications”. Acta Mineralogica- Pertrographica, 36, 101-116, 1995.
  • [156] Streckeisen A. “Das Nephelinsyenit-Massiv von Ditro (Siebenbürgen)”. II. Teil. Schweizeriche Mineralogische und Petrographische Mitteilungen, 34, 336-409, 1954.
  • [157] Streckeisen A. “On the structure and origin of the nepheline-syenite complex of Ditro (Transylvania, Romania)”. Report of the 21th International Geological Congress, 13, 228-238, 1960.
  • [158] Streckeisen A, Hunziker JC. “On the origin of the Nephelinsyenit Massif of Ditró (Transylvania, Romania)”. Schweizerische Mineralogische und Petrographische Mitteilungen, 54, 59-77, 1974.
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  • [160] Dallmeyer DR, Kräutner HG, Neubauer F. “Middle-late Triassic 40Ar/39Ar hornblende ages for early intrusions within the Ditrău Alkaline Massif, Rumania: implications for Alpine rifting in the Carpathian orogen”. Geologica Carpathica, 48, 347-352, 1997.
  • [161] Al- Lazki AI, Seber D, Sandvol E, Türkelli N, Mohamad R, Barazangi M. “Tomographic Pn velocity and anisotropy structure beneath the Anatolian plateau (Eastern Türkiye) and the surrounding regions”. Geophysical Research Letters, 30, 24, 8043, 2003.
  • [162] Yücel C., “Trabzon-Giresun Arasındaki Tersiyer Volkanitlerinin Petrografisi, 40Ar-39Ar Jeokronolojisi, Petrokimyası, Sr-Nd-Pb İzotop Jeokimyası ve Petrolojisi”, Doktora Tezi, Karadeniz Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 285 sayfa, 2013.
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Toplam 164 adet kaynakça vardır.

Ayrıntılar

Birincil Dil İngilizce
Konular Yer Bilimleri ve Jeoloji Mühendisliği (Diğer)
Bölüm Araştırma Makalesi
Yazarlar

Derya Cicerali Bu kişi benim

Cem Yücel

Emre Aydınçakır

Abdullah Kaygusuz Bu kişi benim

Gönderilme Tarihi 29 Eylül 2025
Kabul Tarihi 30 Ekim 2025
Erken Görünüm Tarihi 12 Aralık 2025
Yayımlanma Tarihi 17 Aralık 2025
Yayımlandığı Sayı Yıl 2025 Cilt: 31 Sayı: 8

Kaynak Göster

APA Cicerali, D., Yücel, C., Aydınçakır, E., Kaygusuz, A. (2025). Mineral chemistry, thermodynamic evolution, and crystallization history of late miocene volcanic rocks around posof (Ardahan, Türkiye). Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi, 31(8), 1469-1493. https://doi.org/10.65206/pajes.73473
AMA Cicerali D, Yücel C, Aydınçakır E, Kaygusuz A. Mineral chemistry, thermodynamic evolution, and crystallization history of late miocene volcanic rocks around posof (Ardahan, Türkiye). Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi. Aralık 2025;31(8):1469-1493. doi:10.65206/pajes.73473
Chicago Cicerali, Derya, Cem Yücel, Emre Aydınçakır, ve Abdullah Kaygusuz. “Mineral chemistry, thermodynamic evolution, and crystallization history of late miocene volcanic rocks around posof (Ardahan, Türkiye)”. Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi 31, sy. 8 (Aralık 2025): 1469-93. https://doi.org/10.65206/pajes.73473.
EndNote Cicerali D, Yücel C, Aydınçakır E, Kaygusuz A (01 Aralık 2025) Mineral chemistry, thermodynamic evolution, and crystallization history of late miocene volcanic rocks around posof (Ardahan, Türkiye). Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi 31 8 1469–1493.
IEEE D. Cicerali, C. Yücel, E. Aydınçakır, ve A. Kaygusuz, “Mineral chemistry, thermodynamic evolution, and crystallization history of late miocene volcanic rocks around posof (Ardahan, Türkiye)”, Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi, c. 31, sy. 8, ss. 1469–1493, 2025, doi: 10.65206/pajes.73473.
ISNAD Cicerali, Derya vd. “Mineral chemistry, thermodynamic evolution, and crystallization history of late miocene volcanic rocks around posof (Ardahan, Türkiye)”. Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi 31/8 (Aralık2025), 1469-1493. https://doi.org/10.65206/pajes.73473.
JAMA Cicerali D, Yücel C, Aydınçakır E, Kaygusuz A. Mineral chemistry, thermodynamic evolution, and crystallization history of late miocene volcanic rocks around posof (Ardahan, Türkiye). Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi. 2025;31:1469–1493.
MLA Cicerali, Derya vd. “Mineral chemistry, thermodynamic evolution, and crystallization history of late miocene volcanic rocks around posof (Ardahan, Türkiye)”. Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi, c. 31, sy. 8, 2025, ss. 1469-93, doi:10.65206/pajes.73473.
Vancouver Cicerali D, Yücel C, Aydınçakır E, Kaygusuz A. Mineral chemistry, thermodynamic evolution, and crystallization history of late miocene volcanic rocks around posof (Ardahan, Türkiye). Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi. 2025;31(8):1469-93.