鲁西临沂一带三山子组分布及熔剂用白云岩成矿特征OA

The Ordovician Sanshanzi formation is a typical layer produced by dolomite for flux in western Shandong province,while Weifang-Linyi area is the most widely developed area of Sanshanzi formation.On the basis of identifying the distribution of Sanshanzi formation in Linyi area in the form of"four rock belts",prospecting target of dolomite for flux has been quickly locked.Selecting typical mining areas in each of the four rock belts,based on exploration engineering and analysis data,mineralization characteris-tics of dolomite for flux in Sanshanzi formation in Linyi area have been summarized.It will provide some references for the prospecting of dolomite for flux in western Shandong province and even northern China.The ore bodyies dolomite for flux is located in section c of Sanshanzi formation.The ore body is strictly controlled by the strata.The trend is NE and NW,and the inclination angle is 5°～40°.The thickness of the ore body is 30.5～108.6m.It is positively correlated with the thickness of section c of Sanshanzi forma-tion,and shows a gradually thinning pattern from north to south.The rock is not well-developed.Roof of the orebody is composed of dolomite from section b of Sanshanzi formation,and the direct floor is dolomite containing flint nodules or thin layer argillaceous dolomite from section c of Sanshanzi formation.The ore quality is stable.The average content of MgO is 20.23％～20.74％,with few inclusions and easy open-pit mining.It has good development prospects and is predicted to have a prospective resource of over 2 billion tons.