Geological and Geochemical Characteristics of the Iron-polymetallic Deposit in the Galinge Area,Qinghai Province

The wallrocks of the Galinge iron-polymetallic deposit are Ca and iron-rich skarns,in which the ores consist of magnetite and sulfide-magnetite.The ores share the similar rare earth element(REE) characteristics with the wallrocks,indicating that they were possibly derived from the same source region.The Galinge deposit,which had experienced multistage geological rebuilding,was formed under medium-high temperature.The isotopic compositions of sulfur and oxygen in the ore minerals suggested that the sulfur of ore-forming material was predominantly magmatic sulfur,and the water of ore-forming fluid mainly originated from exhalative hydrothermal fluid.The present study indicated that the Galinge Fe-Co-Bi polymetallic deposit was formed by exhalative-sedimentation and skarnization rebuilding.