Research into the geochemical characteristics of phosphorites of Dengying formation in the area of Weng'an county,Guizhou

The ore types of phosphate in the Languan area of Weng'an is the stromatolites phosphorites.The results for the comprehensive analysis about geochemical characteristics of the constants and trace element content in phosphorus rock sreies through ions spectrometry have some characteristics.It is not only enriched P₂O₅ and CaO,there also has a positive correlation between the content of P₂O₅ and CaO;Besides,the content of P₂O₅ and MgO exist a negative correlation.The conclusion describe that ore minerals of phosphorites is carbonated-fluor apatite;In addition,the main gangue mineral is dolomite.Element content for As,Ba and Sr presented a highly enriched phenomenon,which illustrated the action of desmoplankton collect phosphorus.At the same time,the phosphorites are characterized by enrichment of Sb and As;The ratio Co and Ni,U and Th;The relationship of Cr and Zr suggesting that Languan phosphorites are of submarine hydrothermal deposition.Therefore,the formation of Languan phosphorite is biomineralization plus hydrothermal deposition.