Geological and geochemical characteristics and genesis of Sujia iron polymetallic deposit in Heilongjiang Province

The Sujia iron polymetallic deposit is located in the Zhangguangcai Range metallogenic belt of Heilongjiang Province,controlled by the Yizuomao alkali feldspar granite and granite porphyry.The orebodies were hosted in the contact zone of granite-porphyry and marble,and in the interlayer fracture zone,being mainly as skarn Fe-Zn orebodies in type.The metallic minerals of orebodies are composed mainly of magnetite and sphalerite.The alteration of wall rocks mainly were skarnized,petrified,hornfels,carbonation and chloritization in type,in which the skarnized was closely related to mineralization,being as the main prospecting criteria.The characteristics of geochemistry indicate that the metallogenic material mainly came from the evolution of crust-source magma and upper carbonate rocks.The hydrothermal mineralized bodies and orebodies occurred in the skarn rock which formed by the hydrothermal metasomatism with carbonate layer.Combined with the regional geological background,we determined that the Sujia iron polymetallic deposit was skarn deposit in type.