Original paper

Occurrences and genesis of Fe-skarn in relation to tectonic environment in E-NE Anatolia: geochemical consideration

Tokel, Selçuk; Köprübaşi, Nezihi; Uysal, Ibrahim; Van, Ali


Iron oxide deposits in the eastern part of the Anatolian Peninsula occur in two specialized skarn forming environments. These are the ophiolitic belt of the Tauride suture at the south and the Pontide paleomagmatic-arc at the north. These deposits always occur in the triple contacts where granitoid, basic rock and limestone are seen near each other. A depositional model for the iron deposits is based on convecting supercritical aqueous chloride solutions. Dissolution of iron from the iron-rich basic wall rocks, subsequent transport by convection and deposition are the main stages of the process. The main objective of this study is to present the abundances of ore-forming elements Ni2+, Co2+ and Cr3+ in magnetite and related wall rocks of the Fe-skarns developed in the Pontide subduction belt and to compare these data with those of the Fe-skarns of the Tauride ophiolitic suture, in order to establish whether there is a geochemical link between source rock and iron-ore. We have found marked differences in Ni2+, Co2+ and Cr3+ concentrations between magnetite in the Pontides and the Taurides. The same clear differences are also seen between the basic wall rocks.These chemical associations between the ore mineral and basic wall rocks and presence of the leached rocks (listwaenite), which were depleted in Ni2+, Co2+ and Cr3+, around mineralizations indicate that the source rock for iron is the basic wall rocks.


skarnfe oreturkey