Türkiye Jeoloji Bülteni

The Skarn Formations and Related İron Mineralizations in Dedeyazı - Çavuşlu (Doğanşehir/Malatya) Area

Abstract: The studied area is located 4 kms N-NW of Doğanşehir township in Malatya province. The units of the studied area (from theoldest to the youngest) are; Permo-Triassic Malatya Metamorphics, Upper Cretaceous Berit Group, Upper Cretaceous PolatGranitoid, Middle Eocene Maden Complex, Pliocene Beylerderesi Formation and Quaternary talus and alluviums. Theplutonic rocks(tonalite, diorite) of Polat Granitoid intruded during the Upper Cretaceous effected the Malatya Metamorphics (marble, crystalizetlimestone) and skarn rocks with Fe mineralizations formed as contact-metasomatic at this contact. Fe mineralizations have usuallybeen together with skarn rocks.The skarn formations have developed inform of endoskarn and exoskarns. While endoskarn formations are represented by garnetand epidote skarn rocks, exoskarn formations are represented by garnet, garnet-epidote, epidote-garnet and epidote skarn rocks. Themineral assemblages of the skarn rocks are as garnet (andradite, grossularite), epidote, pyroxene (diopsite,ferrosalite, hedenbergite),plagioclase, K-feldspar (orthoclase), amphibole (hornblende), scapolite (meionite), calcite, quartz, chlorite, magnetite and sphen.The mineralizations occur along the marbles-plutonics contact, in the pockets and fractures extending towards marble. Thethickness of mineralized bodies can reach up to 5-10 m. The main mineral of mineralizations is magnetite. Hematite, specularite,limonite, pyrite, chalcopyrite, malachite and azurite are in less amount, and, covellite and chalcosite are rare.