Geochemical Characteristics of Ores in Chuanyandong Ore Block of Wengfu Phosphate Mine,Guizhou Province
Wengfu Phosphate Mine is an important phosphate mining area in Guizhou Province,and is the repre-sentative deposit of"Wengfu type"phosphate mine,in which the Chuanyandong ore section plays an important role.This study focuses on the basic geological and geochemical characteristics of the Chuanyandong ore block.Through the analysis of major elements,trace elements and rare earth elements,it is clarified that the phosphorite in the Chuanyandong ore block is mainly carbon fluorine apatite,and the ore type is mainly striped and banded psammitic phosphorite,biological particle clastic phosphorite,etc.The P2O5 content of the ore is high,which is generally higher than the average grade of phosphate rock in China.The contents of As,Cr,Ni,Pb,Rb,Sr,U,V and Zr are higher.U/Th,Co/Ni and other ratios show that the depositional process was influenced by the hydro-thermal sediments.The REE distribution pattern is right-inclined type with obvious negative Ce and Eu anomalies,indicating that the phosphorite was formed in an oxidizing environment.
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