Pamukkale Univ Muh Bilim Derg. Ahead of Print: PAJES-71636 | DOI: 10.5505/pajes.2023.71636

Mineral chemistry and pre-eruptive crystallization conditions of Miocene volcanic rocks in the Kütahya (West Anatolia) and surrounding area

Ýrfan Temizel¹, Mehmet ARSLAN¹, Cafer Özkul², Muzaffer OZBURAN^2
1Karadeniz Technical University, Engineering Faculty, Department of Geological Engineering, TR-61080, Trabzon
²Dumlupýnar University, Engineering Faculty, Department of Geological Engineering, TR-43100, Kütahya

The studied Miocene volcanic rocks are observed in the Örenköy, Fýndýkköy, and Kýzýlkaya Tepe regions in and around the Kütahya area. The Örenköy volcanic rocks consist of augite basalt, basaltic andesite and andesite, and show hyalo-microlitic porphyritic and cumulophyric texture, and contain plagioclase (An70-82Ab17-29Or1-2), clinopyroxene (Wo40-44En41-52Fs6-16), orthopyroxene (Wo1-4En64-71Fs27-34) olivine (Fo86-90) and Fe-Ti oxide. The Fýndýkköy volcanic rocks include augite trachybasalt, augite basaltic trachyandesite and trachyandesite, and show hyalo-microlitic porphyritic and intersertal texture, and generally contain plagioclase (An58-88Ab12-38Or1-5), clinopyroxene (Wo44-48En38-47Fs8-17), olivine (Fo41-63) and Fe-Ti oxide, while the andesitic ones also contain biotite. The Kýzýlkaya Tepe volcanic rocks contain augite basalt, augite basaltic andesite and trachyandesite, and exhibit hyalo-microlitic porphyritic, vesicular, intersertal and trachytic texture, and include plagioclase (An53-85Ab14-44Or0-3), clinopyroxene (Wo39-46En41-52Fs8-16), orthopyroxene (Wo2-3En73-75Fs21-25), olivine (Fo52-82) and Fe-Ti oxide. In addition, the pre-eruptive crystallization conditions of the volcanic rocks were estimated using mineral chemistry analyses and thus it was determined that the magmas of the volcanic rocks have evolved by fractionation in magma chambers of the upper continental crust.

Keywords: Miocene volcanics, Mineral chemistry, Geothermobarometry, Kütahya, West Anatolia, Turkey

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Kütahya (Batý Anadolu) ve çevresinde yüzeylenen Miyosen yaþlý volkanik kayaçlarýn mineral kimyasý ve püskürme öncesi kristallenme koþullarý

Ýrfan Temizel¹, Mehmet ARSLAN¹, Cafer Özkul², Muzaffer OZBURAN^2
1Karadeniz Teknik Üniversitesi, Mühendislik Fakültesi, Jeoloji Mühendisliði Bölümü, TR-61080, Trabzon
²Dumlupýnar Üniversitesi, Mühendislik Fakültesi, Jeoloji Mühendisliði Bölümü, TR-43100, Kütahya

Miyosen yaþlý volkanitler, Kütahya ve çevresinde Örenköy, Fýndýkköy ve Kýzýlkaya Tepe yörelerinde yüzeyleme vermektedir. Örenköy volkanitleri genel olarak ojit bazalt, bazaltik andezit ve andezit bileþimli olup hyalo-mikrolitik porfirik ve kümülofirik doku göstermektedir ve plajiyoklaz (An70-82Ab17-29Or1-2), klinopiroksen (Wo40-44En41-52Fs6-16), ortopiroksen (Wo1-4En64-71Fs27-34) olivin (Fo86-90) ve Fe-Ti oksit içerir. Fýndýkköy volkanitleri genellikle ojit trakibazalt, ojit bazaltik trakiandezit ve trakiandezit bileþimli olup hyalo-mikrolitik porfirik ve intersertal doku göstermektedir ve genelde plajiyoklaz (An58-88Ab12-38Or1-5), klinopiroksen (Wo44-48En38-47Fs8-17), olivin (Fo41-63) ve Fe-Ti oksit içerirken, andezitik karakterde olanlar ayrýca biyotit içerir. Kýzýlkaya Tepe volkanitleri ise ojit bazalt, ojitli bazaltik andezit ve trakiandezit bileþimli olup hyalo-mikrolitik porfirik, vesiküler, intersertal ve trakitik doku gösterir ve genel olarak plajiyoklaz (An53-85Ab14-44Or0-3), klinopiroksen (Wo39-46En41-52Fs8-16), ortopiroksen (Wo2-3En73-75Fs21-25), olivin (Fo52-82) ve Fe-Ti oksit içerir. Ayrýca, mineral kimyasý analizlerinden yararlanýlarak volkanitlerin püskürme öncesi kristallenme koþullarý hesaplanmýþ ve böylelikle volkanitleri oluþturan magmalarýnýn üst kýtasal kabuktaki magma odalarýnda ayrýmlaþarak geliþtikleri belirlenmiþtir.

Anahtar Kelimeler: Miyosen volkanitleri, Mineral kimyasý, Jeotermobarometre, Kütahya, Batý Anadolu, Türkiye

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