Konya’nın (Türkiye) batısında Sağlık ve Yatağan bölgesindeki Miyosen lavlarının saha, mineralojik ve petrografik özellikleri.

Yıl 2024, Cilt: 14 Sayı: 4, 1138 - 1148, 15.12.2024

Kerim Kocak

https://doi.org/10.17714/gumusfenbil.1534430

Öz

Konya'nın batısında, dalma-batma ile ilişkili Neojen Erenlerdağı volkanizmasının bir bileşeni olarak geniş lav kubbeleri oluşur. Bu açık gri ila gri renkli domlar yaygın olarak topografik yükseltilere yol açar ve 4 mm kalınlığa kadar iyi gelişmiş bir soğuma zonuna sahip bazı Mafik Mikrokristalin Anklavlar (MME) içerir. Petrografik ve modal görüntü analizi lav örneklerinin çeşitli dokular (holokristalin porfiritik, hipokristalin porfiritik, glomeroporfiritik ve syneusis) içinde başlıca plajiyoklaz (andezin, %8-46), amfibol (%3-17), klinopiroksen (%0-14), biyotit (%3-12), epidot (%0-8), piemontit (%0-3), kuvars (%0-6), sanidin (%0-5) ve opak demir cevheri (%3-43) ile birlikte tali apatit ve zirkondan ninerallerinden oluştuğunu göstermektedir. Soğuma zonu, tam kristalli porfirik bir dokudaki plajiyoklaz (%25) ve amfibol (%5) fenokristalleri ile karakterize edilir. Amfibol, opaklaşma ve kalsitleşme gösterir. Hamur, plajiyoklaz, amfibol (0,3-0,4 mm), epidot ve opak mineralleri içerir. Bu petrografik çalışma, lavın potansiyel olarak bir volkanik patlamayı tetikleyen, muhtemelen felsik magmanın mafik magma tarafından yenilenmesi sırasında fiziksel ve kimyasal karışım süreçlerine uğadığını ileri sürmektedir. İskeletsel ve iğnemsi plajiyoklaz mikrofenokristalinin ve iğnemsi apatitin kristalleşmesi, aşırı soğutulmuş şartlar altındaki hızlı kristalleşmeyi işaret etmektedir.

Anahtar Kelimeler

Görüntü analizi, Konya, lav, mineraloji, Miyosen, volkanizma

Proje Numarası

10401023)

Field, mineralogical and petrographic features of the Miocene lava around Sağlık and Yatağan area, western Konya/Türkiye

Öz

Extensive lava domes occur west of Konya as a component of subduction-related Neogene Erenlerdağı volcanism. These light grey to grey-coloured domes commonly give rise to topographic elevations and contain some Mafic Microcrystalline Enclaves (MME) with a well-developed chilled zone, up to 4 mm thick. Petrographical and modal image analysis show that the lava samples consist predominantly of plagioclase (andesine, 8-46%, 0.11-4.3 mm), amphibole (3-17%, 0.14-1.613 mm), clinopyroxene (0-14%, 0.035-1.845 mm), biotite (3-12%, 0.09-2.30 mm), epidote (0-8%, 0.078-0.166 mm), piemontite (0-3%, 0.145-0.562 mm), quartz (0-6%, 0.4-2.0 mm), sanidine (0-5%, 0.10-0.17 mm), and opaque iron ore (3-43%), along with accessory minerals apatite and zircon, in various textures, including holocrystalline porphyritic, hypocrystalline porphyritic, glomeroporphyritic, and synneusis. The chilled zone is characterised by phenocrysts of plagioclase (25%) and amphibole (5%) in a holocrystalline porphyritic texture. The amphibole shows opacification and calcitization. The matrix includes plagioclase, amphibole (0.3-0.4 mm), epidote, opaque minerals and rare volcanic glass. The petrographical study suggests that the lava likely experienced mixing or mingling processes during the replenishment of felsic magma by mafic magma, potentially triggering a volcanic eruption. The crystallisation of skeletal and acicular microphenocrysts of plagioclase and acicular apatite indicates rapid crystallisation under undercooled conditions.

Anahtar Kelimeler

Image analysis, Konya, Lava, Mineralogy, Miocene, Volcanism

Etik Beyan

Author follows all ethical guidelines including authorship, citation, data reporting, and publishing original research. The author of this article declare that the materials and methods used in this study do not require ethics committee approval and/or legal-special permission

Destekleyen Kurum

Selçuk Uni.

Proje Numarası

10401023)

Teşekkür

In this study, the financial support was provided by Scientific Research Projects Coordination Office of Selcuk Uni. (No: 10401023)

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