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    Geochemical constraints on petrogenesis of Late Cretaceous alkaline magmatism in east-central Anatolia (Hasancelebi-Basoren, Malatya), Turkey
    (Springer Wien, 2009) Ozgenc, I.; Ilbeyli, N.
    Late Cretaceous alkali magmatic rocks occur widely in the Hasancelebi and Basoren regions (Malatya). The Hasancelebi and Basoren intrusive rocks are mainly peralkaline and alkaline-oversaturated. The Hasancelebi intrusive rocks are made up of syenite to quartz monzonite. On the other hand the Basoren intrusive rocks mainly contain feldspathoidal syenites that are cut by feldspathoid-bearing dykes. The Hasancelebi intrusive rocks show comparable field, petrographic and geochemical characteristics with A-type rocks. All intrusive rocks show enrichment in LILE and LREE relative to HFSE. The Th/Yb versus Ta/Yb diagram indicates that all magmatic rocks formed from an enriched mantle source region(s). The parental magma for the Basoren rocks has a higher intraplate component than that from the Hasancelebi rocks which could be attributed to mantle source heterogeneity before collision in east-central Anatolia. Either delamination of the thermal boundary layer or slab-breakoff are likely mechanisms for the initiation of post-collisional magmatism in the Hasancelebi-Basoren areas.
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    Geochemical constraints on the genesis of the Saricakaya intrusive rocks, Turkey: Late Paleozoic crustal melting in the central Sakarya Zone
    (Elsevier Gmbh, Urban & Fischer Verlag, 2010) Kibici, Y.; Ilbeyli, N.; Yildiz, A.; Bagci, M.
    The Sakarya Zone is intruded by several Late Paleozoic granitoids, of which the Saricakaya intrusive rocks in the central Sakarya (Eskisehir) region, is the least-studied. The Saricakaya 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 l-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 Saricakaya 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 Saricakaya intrusive rocks indicate a hybrid origin through partial melting of lower crustal source rocks. (C) 2010 Elsevier GmbH. All rights reserved.