The origin and emplacement dynamics of the volcaniclastic and sedimentary clastic dykes in volcanic fields: A case study from the Erenlerdağ-Alacadağ Volcanic Complex (Konya-TURKEY)

Authors : Mesut Gündüz, Ali Müjdat Özkan, Kürşad Asan
Pages : 1073-1082
Doi:10.5505/pajes.2025.57227
View : 82 | Download : 162
Publication Date : 2025-11-13
Article Type : Research Paper
Abstract :Distinguishing a volcaniclastic dyke from a sedimentary clastic dyke is one of the major tasks in volcanological field studies due to its different origins. As a volcaniclastic dyke, pyroclastic dykes have great importance in locating volcanic vent facies for ignimbrite-forming eruptions. Here, our purpose is to determine the origin of clastic dykes and find the vent facies for ignimbrites from the Mio-Pliocene Erenlerdağ-Alacadağ Volcanic Complex (ErAVC), Central Anatolia. The ErAVC covers a large area in the southwest of Konya (Central Anatolia,Türkiye) and shows unimodal character. The ErAVC consists of calc-alkaline basaltic-andesite (enclaves), andesite, dacite, and rarely rhyolite. It comprises mainly lava domes/lava flows and their volcaniclastic counterparts (block and ash flows, ignimbrites). The ignimbrites (Erenkaya-1, 2, and 3) compositionally range from andesite to dacite. Clastic dykes cut the Erenkaya ignimbrites in three different locations along the northeast of the ErAVC. The first group of these dykes consists of mainly very fine-grained ash-size material and lithic-rich wall side facies, exhibiting characteristics of a pyroclastic dyke emplaced by the fluidization of volcaniclastic materials. The other one,which is fine-grained material from the edges, while the middle part contains very coarse (block-sized) and dense pumice components. Field studies show that this dyke was emplaced by post-volcanic secondary processes (e.g. sedimentary clastic dyke) as a fissure fill. These clastic dykes indicate that a caldera collapse process in the north of the ErAVC may form the Erenkaya ignimbrites.
Keywords : Volkaniklastik ve Sedimanter klastik dayklar, Piroklastik kayalar ve İgnimbiritler, Volkanostratigrafi, Erenlerdağ-Alacadağ Volkanik Kompleksi, ErAVK

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