The Geochemical Characteristics of Rare Earth Elements and Genesis of the Fluorite Deposits in Luanchuan-Songxian Area,Southwest Henan Province
The geological characteristics and rare earth elements of fluorite deposits in Luanchuan-Songxian area,Henan Province were studied in order to discuss the metallogenic materials,evolution of ore-forming fluids,and the genesis of the deposits.The results show that the ΣREE content,LREE/HREE value,δEu and δCe of fluorite samples are 7.17×10-6～178.02×10-6,0.30～4.31,0.21～1.04 and 0.11～0.93,and their average value are 67.85×10-6,1.80,0.64 and 0.76 respectively,and that chondrite-normalized REE patterns of fluorite is flat on the whole,and the fluorite has medium Eu and Ce negative anomaly.By comparing the rare earth element characteristic values of fluorite,stratigraphic rocks and Mesozoic granite and analyzing the abundance of Ca and F of geological body,it is considered that the metallogenic materials of deposits which were generated in large-scale fluorite mineralization were mainly derived from Taihua group and Xionger group strata and secondly from Mesozoic granite or post-magmatic hydrothermal fluids,and the participation of meteoric water and the migration of ore-forming fluids were the main factors for the gradual transiton of ore-forming fluids from reducing to oxidizing environment.The La/Ho-Y/Ho relationship diagram shows that the fluorite mineralization has the characteristics of homology in the large-scale time range and has different periods in small-scale time range.The fluorite deposits in Luanchuan-Songxian area are fault-controlled hydrothermal deposits whose metallogenic materials were derived from strata,magmatic rocks and post-magmatic fluids which provided driving heat for mineralization,and whose main ore-forming water were meteoric water.
fluorite depositrare earth elementmetallogenic materialgenesis of depositsLuanchuan-Songxian area,Henan Province
万方数据
维普
