Petrology of magmatic rocks between Çelikhan-Sincik (Adıyaman-Turkey)

There are alot of tectono-magmatic/stratigraphic units between Çelikhan ? Sincik (Adıyaman). These units have intrusively and discordantly-tectonicaly contact relations. The units located at this region, are represented by autochtonous and allochtonous units. The autochtonous units lower to upper are; Terbüzek Formation, Besni Formation, Germav Formation, Midyat Formation and Lice Formation.The allochtonous units are, Pütürge Metamorphics, Malatya Metamorphics, Kömürhan Ophiolites, Koçali Complex, Şifrin plutonic rocks, Maden Comlex and Çüngüş Formation. Maden Complex, Kömürhan Ophiolites, Şifrin plutonic rocks and the vein rocks which cuts the Pütürge Metamorphics, consist of magmatic rocks, are the main subject of this study.The ophiolites cutten by the intrusive rocks, belongs to the Elazığ Magmatics. Because of this, and the petrographic and geochemical characteristics it is thought that the ophiolites outcrops in the studied area, shows the similar properties with Kömürhan Ophiolite and this rocks were placed by composition regime from the North. Serpantinite, harzburgite and dunites with mafic cumulates (banded gabbros), isotrope gabbros (gabbros contains olivin and clinopyroxene, diorite) and isolated diabase dykes composed of the Upper Cretaceous Kömürhan Ophiolites. According to the geochemical analysis results, it defined that, the ophiolitic rocks have tholeitic characters and formed at the suprasubduction zone.There are different types of rocks, from acidic to basic in the Upper Cretaceous Şifrin plutonic rocks. Mafic microgranular enclaves founded in the felsic plutonic rocks. 61,4 and 62,3 million yearly results taken by K-Ar measurements, made on biotites of leucoquartzmonzonites (Şifrin intrusive rocks) in Pişkin(1978)?s study in this region. According to land observations and geochemical-geochronological datas it is defined that Şifrin plutonic rocks, shows the similar properties with Elazığ Magmatics and this rocks were placed allochtonously by composition regime.Karadere Formation (Maden Complex) represented with basalt (pillow lavas) and andesite-diabase. 45, 44.8 and 52.0 million yearly resuts taken by K-Ar measurements, made on the diabase and andesite samples of this unit. In geochemical studies, it is defined that, the pillow lavas are related with supra-subduction formed on oceanic crust and andesite and diabase samples are related with supra-subduction which formed on continental crust partly after this process. Also it is defined that the andesite and diabase samples are calcalcalen and products of arc volcanismİntermediate and acidic rocks, cutt of Pütürge Metamorphics, first time defined in this study. And they appreciated as two different lithological units, Sarkız and Baizge vein rocks. 36±5,8 ve 48,1±5,5 million yearly results taken from the diabase and andesite porphyr samples of this unit. Because of the Sarkız vein rocks shows the similar geochemical, petrographic, petrological and geochronological properties with Karadere Formation (Maden Complex), this rocks were produced during immature island arc volcanism probably as Maden Complex. Baizge vein rocks were produced during the further phases of the volcanism which formed the Sarkız vein rocks. Therefore, it is thought that the Baizge vein rocks were a product of an ensimatic immature island arc volcanism developed on the partly oceanic, also continental crust of the Middle Eocene Maden Marginal Basin located probably to the North of the Pütürge Massif.Anahtar Kelimeler: Çelikhan-Sincik, Vein rocks, Şifrin Group, Kömürhan Ophiolite, Volcanic arc