文摘
The Sakarya Zone is intruded by several Late Paleozoic granitoids, of which the Sarx131;cakaya intrusive rocks in the central Sakarya (Eskişehir) region, is the least-studied. The Sarx131;cakaya intrusive rocks consist mainly of quartz diorite-granodiorite, granodiorite and granite. They are, geochemically, divided into two groups: diorites and granites. The former is medium-K and calc-alkaline (mainly I-type), whereas the latter is high-K to shoshonite and calcic (I-type). Typical minerals for both rock types are plagioclase, K-feldspar, quartz, biotite, hornblende and Fe–Ti oxides. Chondrite-normalized REE patterns for the Sarx131;cakaya intrusive rocks are moderately fractionated and have small negative Eu anomalies. They are enriched in LILE and LREE relative to HFSE showing characteristics of arc-related granitoids. Geochemical characteristics of the Sarx131;cakaya intrusive rocks indicate a hybrid origin through partial melting of lower crustal source rocks.