Petrographic and Geochemical Features of Calc-alkaline and Alkaline Plutonic/Subvolcanic Rocks in the Cappadocia Region (Nev？ehir, Central Anatolia)

In the Cappadocia region, the Bayramhac？, ？di？da？？, G？ynük, Karada？, Ye？il？z, Ak？ata？ plutonic and/or subvolcanic rocks exposing in the northern part of the Nev？ehir province and Ac？g？l plutonic rocks cropping out at the south are included to the Central Anatolian Granitoids. The Ak？ata？ pluton, exposing at the south of Nev？ehir, has monzogranite composition and rarely contain mafic microgranular enclave (MME) and K.feldspar megacrysts. Magmatic rocks in the northern section have quite different compositions varying from monzogranite to quartz monzonit / monzodiorite - monzonite - phonolitic tephrite / tephritic phonolite. Quartz monzonitic / monzodioritic rocks dominantly contain MME and large K.feldspar megacrysts. Monzonitic rocks are in contact with the porphyritic subvolcanic rocks which contain K-feldspar or leucite megacrysts. The monzogranitic rocks in the region are of subalkaline, high-K series calc-alkaline character and I-type leucogranite. Quartz monzonite, monzonite / monzodioritic rocks show compositions of subalkaline, high-K calc-alkaline to shoshonitic with I-type melt character. Monzonitic and phonolitic tephrite / tephritic phonolite rocks exhibit yield A-type melt characteristics with alkaline and shoshonitic composition. Magmatic rocks with different compositions present different trace element abundance. Light rare element (LREE) enrichment ratios tend to increase from monzogranite ((La/Yb) n = 4.58 – 12.11) to quartz monzonite / monzodiorite ((La/Yb) = 12.06 – 33.78) and monzonite and phonolitic tephrite / tephritic phonolite rocks ((La/Yb) n n = 23.29 – 82.17). In Ocean ridge granite normalized element diagrams, all magmatic rocks show large ion lithophile elements (LILE: K, Rb, Ba) enrichment with respect to high field strength elements (HFSE: Ta, Nb, Hf, Zr, Y) indicating that they were formed in a subduction zone and/ or collisional tectonic setting. However, alkaline magmatic rocks are represented by significant LIL (K, Rb, Ba, Th) and HFS (Ta, Nb, Ce and Zr) enrichment compared to calc-alkaline magmatic rocks. The petrographic and wholerock chemistry data from the Cappadocia Region indicate that studied magmatic rocks were formed by subduction zone magmatism and the contribution from subcontinental lithospheric mantle is much noticeable for the A-type plutons