王集磷矿矿石类型及成因分析

王集磷矿矿石类型有三种：紫灰色纹层状磷块岩（Ph1），灰色纹层状磷块岩（Fh1），黑色纹层状磷块岩（Ph1）。成矿介质，Ph1的为富磷、钙、碳的矿化热卤水，Ph3的为富磷、钙、碳、硅的矿化热卤水。Ph1的成矿环境为氧化条件下、平静、开放的深水盆地，Ph3的为还原条件下、较动荡、封闭的地表泻湖。成矿物质均源于秦岭海槽。矿床由化学结晶成矿作用和生物化学成矿作用形成。温压变化和生物活动是重要成矿因素。

Ore Type and Its Genetic Analysis of the Wangji Phosphorus Deposit

There are 3 types of phosphorus ore that are purple-gray fine-bedded phosphorite（Pht）, gray fine-bedded phosphorite （Ph0 and black fine-bedded phosphorite（Ph3） in the Wangji phosphorus deposit. Mineralized water of Ph1 ore is hot brine rich in P, Ca and C, and that of Ph3 is rich in P, Ca, C and Si. Mineral milieu of Ph1 ore is open and calm deep-basin in and oxidizing condition, and that of Ph3 is closed and active ground lagune in reduction condition. Mineral-forming matter of Ph1 and Ph3 are from the Qinling sea-floor trench. The deposit are formed by chemical crystallization and bioprocesschemical process. Variability of temperature and pressure and biologic activity are important mineral factors.