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
Destekleyen Kurum
Selçuk Uni.
Proje Numarası
10401023)
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
Teşekkür
In this study, the financial support was provided by Scientific Research Projects Coordination Office of Selcuk Uni. (No: 10401023)
Kaynakça
- Asan, K., & Erturk, M. A. (2013). First Evidence of Lamprophyric Magmatism from the Konya Region, Turkey: a Genetic Link to High-K Volcanism. Acta Geologica Sinica-English Edition, 87(6), 1617-1629. https://doi.org/10.1111/1755-6724.12163
- Bacon, C. R. (1986). Magmatic Inclusions in Silicic and Intermediate Volcanic-Rocks. Journal of Geophysical Research-Solid Earth and Planets, 91(B6), 6091-6112.
://WOS:A1986C311900014 - Bennett, E. N., Lissenberg, C. J., & Cashman, K. V. (2019). The significance of plagioclase textures in mid-ocean ridge basalt (Gakkel Ridge, Arctic Ocean). Contributions to Mineralogy and Petrology, 174(6). https://doi.org/10.1007/s00410-019-1587-1
- Blumenthal, M. M. (1944). Bozkır Güneyinde Toros Dağlarının Serisi ve Yapısı. İst.Üniv. Fen Fak. Mec(B), 30.
- Campbell, I. H., & Turner, J. S. (1986). The influence of viscosity on fountains in magma chambers. Journal of Petrology, 27(1), 1-30.
- Cao, M., Evans, N. J., Reddy, S. M., Fougerouse, D., Hollings, P., Saxey, D. W., McInnes, B. I. A., Cooke, D. R., McDonald, B. J., & Qin, K. (2019). Micro- and nano-scale textural and compositional zonation in plagioclase at the Black Mountain porphyry Cu deposit: Implications for magmatic processes. American Mineralogist, 104(3), 391-402. https://doi.org/10.2138/am-2019-6609
- Dewey, J., Hempton, M., Kidd, W., Saroglu, F., & Şengör, A. (1986). Shortening of continental lithosphere: the neotectonics of Eastern Anatolia—a young collision zone. Geological Society, London, Special Publications, 19(1), 1-36.
- Eichelberger, J. (1980). Vesiculation of mafic magma during replenishment of silicic magma reservoirs. Nature, 288(5790), 446-450.
- Eichelberger, J. C. (1980). Vesiculation of mafic magma during replenishment of silicic magma reservoirs. Nature, 288(5790), 446-450. https://doi.org/10.1038/288446a0
- Eren, Y. (1993). Konya kuzeybatısında Bozdağlar Masifinin otokton ve örtü birimlerinin stratigrafisi (in Turkish). Geol Bull Turk, 36, 7-23.