Geochronological and geochemical characteristics of fractionated I-type granites associated with the skarn mineralization in the Sangan mining region, NE Iran

摘要

The Sangan mining region, which has a proven reserve of approximately 1000 Mt of 53% iron ore, is located in the Khaf-Kashmar-Bardeskan volcano-plutonic belt in northeastern Iran. The geological units in the eastern zone of the Sangan region consist of Precambrian schists, Jurassic sedimentary rocks and Tertiary subvolcanic granitoid intrusions. Iron skarn mineralization consists of stratiform and massive bodies in the carbonate rocks that are adjacent to the granitoid intrusions. Detailed field mapping revealed that 39-Ma syenitic intrusive bodies in the western and central zones of the Sangan region were the main sources of heat and fluid for the iron mineralization.