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Тезисы международной конференции

Рудный потенциал щелочного, кимберлитового

 и карбонатитового магматизма

Abstracts of International conference

Ore potential of alkaline, kimberlite

and carbonatite magmatism

Geochemical characteristics of the Late Miocene to Pliocene Ulumuhsine sill of the Erenlerdagi volcanics, Konya, Central Turkey

Kocak, K.

Geology Department, Selcuk University, Konya-TURKEY



The Late Miocene to Pliocene volcanism produced extensive formation of lava domes, nue´e ardentes and ignimbrite deposits in west, northwest of the Konya area Central Anatolia, Turkey.  However, the Ulumuhsine sill is unique in the volcanic system, with its rare occurrences.  Regions of the sill in which flow was short-lived have chilled margins, and experienced a single injection of magma. It contains quartz and calcite-filled vesicles.  Main constituents are euhedral to subhedral clinopyroxene, olivine, plagioclase and minor sanidine in a holocrystalline porphyric texture.  It is mostly metaluminous and basaltic trachyandesite in composition, with alkaline to subalkaline affinity.  They are characterized by an enrichment of large ion lithophile elements e.g., Cs, Rb; light rare earth elements [(La/Sm)N:3.6-4.1], and depletion of heavy rare earth elements [(Gd/Lu)N: 1.6-1.9].  The primordial mantle normalized multi-element spidergrams of the samples are characterized by existence of negative Nb, P and Ti anomalies, indicating subduction signatures for their genesis. However, various geotectonic setting diagrams imply calcalkaline basalt to within plate alkaline basalt setting for the samples.


Key words: sill, alkaline magma, volcanism, Konya, Turkey