Abstract
Convergent plate margins are the most intense areas of granitoid magmatism on Earth. The Eastern Pontide Magmatic Belt in NE Turkey represents a paleo-arc with numerous quartz diorite to syenite intrusions, ranging in age from 142 to 56 Ma and being composed of K-feldspar, plagioclase, quartz, pyroxene, hornblende, biotite, and Fe-Ti oxides. The granitoids exhibit lowto high-K calc-alkaline, metaluminous to slightly peraluminous I-type features and contain abundant mafi c magmatic enclaves (MME). They are characteristically enriched in large ion lithophile elements (LILE) and light rare earth elements (LREE) relative to high fi eld strength elements (HFSE). Chondrite-normalized REE patterns are fractionated (LaN/LuN = 1.49–17.4) with pronounced negative Eu anomalies (Eu/Eu* = 0.46–1.77). Initial Sr/Sr values are between 0.7056 and 0.7079, and eNd(i) values between –5.3 and 1.6. Fractional crystallization, magma mixing/mingling and crustal contamination played an important role during magma evolution. All these characteristics, combined with the low values of K2O/Na2O, Mg-number, ASI and ratios of Al2O3/ (FeO+MgO+TiO2) and (Na2O+K2O)/(FeO+MgO+TiO2), suggest an origin by dehydration melting of mafi c (amphibolitic) or tonalitic lower crustal source rocks.
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