YANG Rui-dong, MAO Tie, CHEN Ji-yan, WU Wen-ming, XU Shi-lin, REN Hai-li

(College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China)

Abstract: Phosphorus bearing formation constituted by bioclastic phosphate rock at the bottom the Cambrian had developed in Zhijin－Qingzhen area, Guizhou Province. It is famous in world because of rich rare earth element in phosphate rock. On the basis of the study on sediment characteristics of 12 bearing- phosphorus sections, it shows that the phosphate rocks are of complicated sedimentary structure, such as breccia phosphate rock, biological phosphate rock, bioclastic phosphate rock, lenticular phosphate rock, cross-bedding phosphate rock, banding phosphate rock, and layer phosphate rock. The analysis on the facies of phosphorus bearing formation show that the banding phosphate rock is main deposited at sub-tidal zone with low-energy in Qingzhen area; the breccia phosphate rock is main deposited at intertidal and sub-tidal zone with high-energy in Maobeichong area; thedolomite and phosphorus dolomite is main deposited at supratidal zone and tidal lagoon with low-energy in Shuiyantang－Nayong and Xiongjiachang－Xishui area. Results show that rising ocean currents with abundant phosphorus pass Maobeichong tideway, and abundant phosphorus was deposited in barrier bay at Gezhongwu－Xinglian area. Therefore, the phosphorus deposit main developed at Gezhongwu－Xinglian area; the forming environment of phosphorus deposit is mainly at intertidal and sub-tidal zone with high-energy. The palaeogeographic map and contour map of P2O5 content in Meishucun stage are drawn. Additionally, the mineralizing factors of phosphorite deposit and abundant phosphorus area were also analyzed in this paper.

Keywords: Sedimentary characteristic; Sedimentary environment; Phosphorite; Qingzhen—Zhijin County; Guizhou Province, China

E-mail：rdyang@gzu.edu.cn  

ACTA MINERALOGICA SINICA Vol. 37, No. 4, 2017, Page 448-455