QUALITY EVALUATION OF FIBER BASALT IN HUILI AREA,SICHUAN PROVINCE
Basalt fiber is recognized as a national strategic resource with extensive applications across vari-ous fields.However,the overall level of mineral exploration and its role in supporting industrial develop-ment remains relatively low.In particular,the standards for mining and evaluating high-quality basalt fi-ber need significant improvement.The basalt deposits of Longzhou Mountain and Emei Mountain in Huili City,Sichuan Province are widespread,with rock masses exceeding 3000 meters in thickness locally.These areas contain several layers of massive basalt characterized by stable chemical properties,ideal for producing high-quality basalt fiber.Based on field investigations,the quality of continuous basalt fiber de-posits in the Huili area is assessed through petrography and element geochemistry.This evaluation aims to explore the impact of chemical composition,characteristic parameters,industrial indices,and genetic traits on the quality of basalt fiber.The findings indicate that:(1)Basalt mineral resources in the Huili area are abundant,promising significant prospects for exploration.The thickness of dense,massive ba-salt-suitable as high-quality raw material for basalt fiber-exceeds 1000 meters.(2)Geochemical analysis of basalt samples yielded the following results:SiO2=47.01％-49.81％,TiO2=2.79％-5.22％,CaO=5.37％-11.22％,A12O3=11.73％-14.87％,TFe2O3=12.79％-15.03％,MgO=3.53％-10.22％,Na2 O+K2 O=1.76％-5.04％,acidity coefficient(Ma)=3.12-5.22,FeO/Fe2 O3=0.90％-2.31％,SiO2+Al2O3=61.08％-63.75％.Additionally,the raw material exhibits suitable melting points and vis-cosity.The resulting fiber demonstrates excellent stability and strength,and the basalt retains a stable sil-icate structure during wire drawing.(3)Comprehensive analysis reveals that the basalts in the area belong to the alkali-subalkaline series,sharing trace and rare earth element characteristics similar to OIB basalts.The basaltic magma is believed to originate from stable garnet peridotite areas within the continental plate,unaffected by crustal assimilation or mixing during ascent.(4)Optimal levels of lithium(Li),nickel(Ni),zinc(Zn),cerium(Ce),and erbium(Er)in Huili basalt enhance its high-temperature and corrosion resistance properties.In summary,the research area boasts ample reserves of fiber basalt ore,favorable geological conditions for ore occurrence,and exceptional ore quality,making it an ideal location for mining high-quality basalt fiber raw materials.
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