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一、矿区地层概况该矿区为前震旦纪变质岩，磷矿为沉积变质型。由于历经多次变质和构造变动，无论在岩相对比上，矿床的构造形态上均较复杂，由下到上：1．太古界混合岩，其基质为黑云斜长片麻岩，脉体为微斜长石、酸性斜长石及石英集合体。2．含砾石英岩，该层岩相变化较大，厚5～30米；3．磷灰岩，厚度2～10米，4．白云质大理岩，深部合少量石膏，其中夹有薄层透镜状磷灰岩，厚度20～150米；5．白云石英片岩夹含石墨白云石英片岩，底部夹薄层磷灰岩（第二磷矿层），厚20～200米。6．二云斜长片麻岩及浅粒岩，与上述岩层呈断层接触，厚200～300米。
First, the mining strata profile The mining area for the former Sinian metamorphic rocks, phosphate rock deposits metamorphism. Due to the many metamorphism and tectonic changes, the structural morphology of the deposit is more complex both in terms of lithofacies and from bottom to top: 1. Archean mixed rock, the matrix of black plagioclase gneiss, veins of plagioclase, acidic plagioclase and quartz aggregate. 2. Gravel quartzite, the rock facies changes larger, 5 to 30 meters thick; Phosphorite, thickness 2 to 10 meters, 4. Dolomitic marble, deep with a small amount of gypsum, which is sandwiched between thin lens-shaped phosphorite, thickness of 20 to 150 meters; Dolomite schist contains graphite dolomite schist, the bottom of the folder thin layer of apatite (second phosphate layer), thickness 20 ~ 200 meters. 6. Second cloud plagioclase gneiss and shallow granulite, with the above-mentioned rock is fault contact, thickness 200 ~ 300 meters.