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Рудный потенциал щелочного, кимберлитового

 и карбонатитового магматизма

Abstracts of International conference

Ore potential of alkaline, kimberlite

and carbonatite magmatism

Field, petrographic and geochemical characteristics of the alkaline magmatism in central Anatolia (Turkey)

Yalcin M.G.*, Ilbeyli N.*, Pearce J.A.**, Yalcin F.*

* Akdeniz University, Faculty of Engineering, Department of Geological Sciences, 07058 Antalya, Turkey; ** Cardiff University, School of Earth & Ocean Sciences, CF10 3AT Cardiff, United Kingdom



The Anatolian plate is located in an Eastern Mediterranean collision zone between Eurasian and African-Arabian plates. This plate is a complex of continental blocks, each of which are surrounded by the northern and southern branches of Tethys. This complex framework shaped as the result of two main branches of the Neo-Tethyan Ocean during the Late Cretaceous-Eocene (Sengör and Yilmaz, 1981).

The investigating area is placed in this complicated frame, named the central Anatolian crystalline complex (Göncüoglu et al., 1991). It consists of several metamorphic massifs numerous granitic to syenitic plutons and dismembered ophiolites, and Tertiary volcanic and sedimentary rocks that unconformably overly the crystalline rocks (Göncüoglu et al., 1991).

In this complex, calc-alkaline and alkaline magmatism of the latest Cretaceous age was formed in collision-related tectonic setting (Ilbeyli et al., 2004). This magmatism produced a wide variety of rock types, from calk-alkaline through subalkaline and alkaline (Ilbeyli et al., 2004). Their compositions range from feldspathoid-bearing monzosyenite through monzonite to granite (Ilbeyli et al., 2004). They are also metaluminous (I-type) to peralkaline (A-type).

Except for the feldspathoid-bearing rocks, these rocks have igneous enclaves. The calc-alkaline and subalkaline rocks are cut by aplite and pegmatites. On the other hand the feldspathoid-bearing rocks are cut by phonolitic dykes.

The main mineral components in the calc-alkaline-subalkaline rocks are quartz, plagioclase (An52-25), alkali feldspar (Or95-79), amphibole (edenite, magnesio-hornblende, magnesio-hastingsite), biotite and clinopyroxene (salite). Accessory components include magnetite, ilmenite, zircon, apatite, allanite and monazite. Those in the alkaline samples are (An71-1), ortoklas (Or95-60), amphibole (hastingsite, edenite), clinopyroxene (salite), garnet (melanite) and biotite. Accessory components are magnetite, zircon, apatite, xenotime, monazite, allanite and fluorite.

These rock types crystallized under a wide range of pressure (5.3-2.6 kbar) and temperatures (858-698 °C) from highly oxidized magmas (log fO2 -17 to -12) (Ilbeyli, 2005).

The intrusive rocks from the complex have a range from ~46 to 80 wt% SiO2. These plutonic rocks are enriched in LILE (K, Rb, Ba, Th) relative to HFSE (Ta, Nb, Hf, Zr, Sm, Y, Yb), and also radiogenic in terms of Sr, and unradiogenic in terms of Nd isotope ratios (Ilbeyli et al., 2004). Moreover, these rocks have a range of δ18O values between 6.5‰ and 14.8‰ (Ilbeyli et al., 2009).

Multi-trace element diagrams and isotope ratios indicate distinct mantle sources with different amount of crustal components because of subduction. In addition radiogenic (Rb, Sr) and stable isotope (O) diagrams display that all rocks have experienced different amount of crustal assimilation (also crust compositions).

In central Anatolia, these heterogeneous distribution magma types may indicate a non-uniform source(s) resulting distinct kind of rocks. Mechanism for the different source types in central Anatolia could be related to perturbation of metasomatized lithosphere or delamination of the thermal boundary layer.



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

Ilbeyli, N., Pearce, J.A., Thirlwall, M.F., Mitchell, J.G. Petrogenesis of collision-related plutonics in central Anatolia, Turkey. Lithos. 2004. Vol. 72, P. 163-182.

Ilbeyli N. Mineralogical-geochemical constraints on intrusives in central Anatolia, Turkey: tectono-magmatic evolution and characteristics of mantle source. Geol Mag. 2005. Vol. 142: P. 187-207.

Ilbeyli, N., Pearce, J.A., Meighan, I.G., Fallick, A.E. Contemporaneous late Cretaceous calc-alkaline and alkaline magmatism in central Anatolia, Turkey: oxygen isotope constraints on petrogenesis. Turkish Journal of Earth Sciences. 2009. Vol. 18, P. 529–547.

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