GEOLOGY AND GENESIS OF XIHUITONG LOW-GRADE PHOSPHATE DEPOSIT IN WESTERN LIAONING PROVINCE

The Xihuitong low-grade phosphate deposit in western Liaoning Province is located in the northwest of Mesozoic Fuxin-Yixian basin, with the orebody of apatite-bearing quartz diorite gneiss occurring in stratified and stratiform-like forms, and stable low P₂O₅ content. The main mineral compositions in the ores are plagioclase, biotite, hornblende, apatite, quartz, magnetite and pyroxene. Through the study of metallogenic geological setting, geological characteristics and orebodies of the phosphate deposit, the paper discusses the ore-forming materials, metallogenic tectonic setting, and mineralization. It is preliminarily considered that the deposit is controlled by the Archean greenstone formation, and is closely related to volcanic rocks in time and space. The ore-forming period can be subdivided into initial mineralization, metamorphic mineralization and hydrothermal transformation stages.