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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

Carbonatite and alkaline magmatism in central-east of Anatolia (Malatya, Turkey)

Ilbeyli N.*, Ozgenc I.**

* Akdeniz University, Faculty of Engineering, Department of Geological Sciences, 07058 Antalya, Turkey;** Dokuz Eylul University, Faculty of Engineering, Department of Geological Sciences, 35160 Izmir, Turkey



 Turkey is located within the Eastern Mediterranean part of the Alpine-Himalayan orogenic system. It consists of a number of continental blocks disconnected by ophiolitic suture zones. These sutures mainly formed from northern and southern branches of the Neo-Tethyan ocean during the Late Cretaceous-Eocene (Sengör and Yilmaz, 1981).

The study area is located in the eastern part of central Anatolia. Although the investigated area is situated in the eastern Tauride platform, some authors (Boztug, 2000) argued that they are located in the central Anatolian crystalline complex (Göncüoglu et al., 1991; Boztug et al., 2007).

The collision-related Late Cretaceous alkali magmatic rocks occur around the Hasancelebi and Basören regions (Malatya) (Ozgenc and Ilbeyli, 2009). Carbonatitic rocks found within the syenites around Basören area (Ozgenc and Ilbeyli, 2009). REE, Mo and Th mineralizations are quite common in these syenites and are associated with skarn formations.

The alkaline rocks around Hasancelebi occur as stocks. They are mainly syenite, quartz syenite and, rarely, monzonite and quartz monzonite. They are cut by aplitic, pegmatitic and mafic dykes and enclaves are common. The rocks are pinkish, medium-grained to porphyritic (Ozgenc and Ilbeyli, 2009).

Those around Basören are also found as stocks. They are feldspathoid (nepheline, ± sodalite) syenite. They are pinkish to grey, medium-grained to porphyritic. They are cut by grey, dark grey-colored feldspathoid-bearing and mafic dykes. The former is fine-grained, locally porphyritic, with leucite and mainly phonolitic in composition (Ozgenc and Ilbeyli, 2009). Carbonatitic rocks are found as dykes within the syenites in Basören area, where carbonatite-hosted fluorite deposits are also common (Ozgenc and Kibici, 1994; Ozgenc, 1999).

This calcium-carbonatite is the last-stage of the intrusion resulting the fenitization of the syenites (Ozgenc, 1999).

 The plutonic rocks show a range in SiO2 values from 54 to 72 wt.%; the least acidic ones belong to the Basören rocks. All intrusive rocks are mainly peralkaline and alkaline-oversaturated. The Basören rocks are more strongly alkaline and less silica-saturated compare to the Hasancelebi rocks. The alkaline rocks around Hasancelebi display field, petrographic and geochemical characteristics similar to A-type rocks.

 All intrusive rocks show enrichment in LILE and LREE relative to HFSE. Trace element versus trace element ratio diagrams display that all rocks derived from an enriched mantle source region(s). Whereas the Basören rocks carry more intraplate component than the Hasancelebi rocks. These diagrams also indicate that Hasancelebi and Basören rocks may not be formed from the same parental magma (Ozgenc and Ilbeyli, 2009). These alkaline-peralkaline magma(s) associated with carbonatite-rich rocks could be derived from metasomatized lithospheric mantle. Therefore, these carbonatite-rich rocks may also be carbothermal residua rather than carbonatite.



Boztug, D. S-I-A- type intrusive associations: geodynamic significance of synchronism between metamorphism and magmatism in central Anatolia, Turkey. In: Bozkurt E, Winchester JA, Piper JDA (eds) Tectonics and magmatism in Turkey and the surrounding area. Geol Soc Spec Publ No:173. 2000. P.407-424.

 Boztug, D., Harlavan, Y., Arehart, G.B., Satir, M., Avci, N. K-Ar age, whole-rock and isotope geochemistry of A-type granitoids in the Divrigi-Sivas region, eastern-central Anatolia, Turkey. Lithos. 2007. Vol.97. P.193-218.

Göncüoglu, M.C., Toprak, V., Kuscu, I., Erler, A., Olgun, E. Geology of the western part of the Central Anatolian Massif. Part I: Southern Section. Turkish Petroleum Corporation (TPAO) Report. 1991. Report No.2909. (unpublished, in Turkish).

Ozgenc, I. Carbonatite-hosted fluorite and britholite mineralization at Sofular area, Malatya, Turkey. In: Stanley CJ (ed) Mineral deposits: processes to processing. Proceedings of the Fifth Biennial SGA Meeting and the Tenth Quadrennial IAGOD Symposium. 1999. P.663-666.

 Ozgenc, I., Kibici, Y. The geology and chemical-mineralogical properties of britholite veins of Basören village (Kuluncak, Malatya). Geol Bull Turk. 1994. Vol.37. P.77-85 (in Turkish with English abstract)

 Ozgenc, I., Ilbeyli, N. Geochemical constraints on petrogenesis of Late Cretaceous alkaline magmatism in east-central Anatolia (Hasancelebi-Basören, Malatya), Turkey. Mineralogy and Petrology. 2009. Vol. 95, P.71-85.

Sengör, A.M.C., Yilmaz, Y. Tethyan evolution of Turkey: a plate tectonic approach. Tectonophysics. 1981. Vol. 75, P.181-241.