贵州开阳磷矿东翼矿区磷矿石类型及其特征

摘要

提 要 贵州开阳磷矿东翼矿区是新发现的特大型富磷矿床,洋水组是磷矿主要产出层位.以研究区磷矿石特征为出发点,划分矿石类型,结果显示:磷矿石类型以砂-砾屑磷块岩最为常见,叠层石磷块岩次之,其它类型较为少见.不同类型磷块岩对应不同特殊的沉积环境.总体上,研究区处于潮间带-潮下高能带区域,导致先沉积的泥晶磷块岩历经了多期次的沉积-破碎-波选-冲洗-再沉积作用,最终形成高品位磷块岩.%The Dongyi mining area of Kaiyang phosphate mine in Guizhou province is a newly discovered super-large phosphate-rich deposit, and Yangshui formation is the main occurrence horizon of phosphate deposits. Based on the characteristics of phosphate ores in the study area, the ore types were divided, and the results showed that: Sand-gravel phosphate rock is the most common type of phosphate rock, followed by stromatolite phosphate rock, and other types are relatively rare. Different types of phosphorites correspond to different special sedimentary environments. On the whole, the study area is located in the intertidal zone-subtidal high-energy zone, which leads to the formation of high-grade phosphorus blocks after multiple stages of depositional, crushing, wave separation, flushing and redeposition of the micritic phosphorus blocks.