The Study On Ore Deposit Geological Feature And Metallogenic Regularity Of Wall Rock Phosphate Ore In Mianzhu City,Sichuan Province

The"shifang type"phosphate rock is a typical sedimentary phosphate deposit in China.It has special profile structure,thick layer,rich taste,and svanbergite.Therefore,this paper selected relatively typical"shifang type"in mianzhu-mianzhu Wall rock phosphate ore,based on a detailed survey projects,by field survey,drilling,and constraining,doing detailed researchontheoredepositgeologicalcharacteristics,geological characteristics of ore bodies and petrological features,and discusses metallogenic regularities,for improving the mianzhu wall rock phosphate ore bed reserves to seek a certain prospecting direction,also provide certain theoretical basis for seek phosphate rock in the region.The main recognition:?1?F103?F201?F202?F203?F105 fault is the largest fault in mining area,that's also the reason why the ore layer is repeated.?2?The phosphorous layer is overlaid on the ancient karst erosion surface oftheuppersiniansystemdengyingformation"Florescent"dolomite,under the"sandy"dolomite of the upper devonian system shavuzi formation.It occurs in the phosphorous bearing strata of the upper devonian system shalyaozi formation?the system shalyaozi formation section 1?.It is produced in layers,like layers,and the layers are stable.?3??#orebody exposed more than 4150 m in the region.The ore body is basically the same as the stratum,overall towards north east-south,trend to north-north west.The thickness of ore body is 1.06¹3.86m,average thickness of 4.31m.Average grade?P₂O₅?of single project is 27.61%.The content of P₂O₅ has a certain relationship with the thickness of phosphorous layer and ore body,both of which have a synchronous decreasing and increase relationship.?4?Prospecting marks:The bottom of the rock strata is the karst erosion surface,and the ore layer has not obviously stratified.It's mainly the breccia,Mixed sizes and nondirectivity.The breccia is semiangular-angular and part of the baguette.Some breccia were metasomatismed by phosphorous diving solution.Hence radiated fibrous shelllike shape,lacy structure.?5?Prospecting direction:The wall rock?orebody northern has control of the same level phosphate rock at mianzhu salt well mine.The south is controlled by faults F103 and F105.But?orebody south there is still a ladder-like orebody occurrence,is a better perspective.