Abstract: At about 4 km. east of Çelikhan (Adıyaman) intrusive rocks crop out in a tectonic zone. These intrusive, leucocratic quartz monzonites form a circumbscribed, post-tectonic stock which is fairly heterogeneous by itslocal compositional variations and by the presence of numerous xenoliths of various origins. A straight zone ofthermal metamorphism, rich in biotite, has developed in the former crystallophyllien rocks at the contact of theintrusion, the fragments of which are found in the lutetian sediments. These observations have been confirmed byK/Ar measurements, made on the biotites (62 m.y.) which show the age of the intrusion.