Abstract: Rocks of the Maden Complex in the Poluşağı area (southeast Malatya) lie over the Pütürge Massifwith a tectonic contact. The Maden Complex of Middle Eocene age is locally composed from bottom to top oflimestone, calc-schist, red-schist, agglomerate, volcanics and the intruding hypabysssal rocksThe volcanic rocks which exhibit smooth chemical continuity are classified as basalt, andesite and minor dacite basedmainly on immobile trace element concentrations (Ti, Zr, Y, Nb, La, Ce). The hypabyssal rocks are gabbro andplagiogranite. The immobile trace and some major element chemistry of the Poluşağı magmatic rocks clearly demonstrates that the rock suite is typically tholeiitic The Poluşağı tholeiitic basalts and gabbros exhibit chemical characteristics of oceanic tholeiites as well as island arc tholeiites- The less differentiated basalts and gabbros are chemically more akin to oceanic tholeiites and the more evolved basalts and gabbros to island arc tholeiites.Geochemical and geological considerations lead to the conclusion that the Poluşağı rock suite was produced duringthe initial stages of an ensimatic immature island arc volcanism developed on the oceanic crust of the Middle Eocene Maden Marginal Basin located probably to the north of the Pütürge Massif.