Geological Characteristics and Genesis of Rb Rich Granitic Aplite in the Pingxiang Area,Jiangxi Province
Granitic aplite in the Pingxiang area,Jiangxi Province is enriched in rubidium(Rb),but no studies have been reported.In order to understand the geological characteristics and genesis of rubidium deposit,this paper studies the major and trace elements and zircon U-Pb dating of the granitic aplite and mica granite in the mining area by polarizing microscope,XRF,and LA-ICPMS after field investigation.The granitic aplite rocks occur as dikes ranging from several meters to tens of meters in width and hundreds of meters to thousands of meters in length.They are mainly composed of feldspar,mica,and quartz,and are rich in SiO2(average 74.71％),with δ=1.21 and A/CNK=2.15,belonging to peraluminous calc-alkaline granite.The average concentration of Rb is 543 ×10-6,and the Zr/Hf ratio is higher(25.36～35.31),while the Nb/Ta ratio is lower(3.13～4.18),indicating the characteristics of highly differentiated granite.The contents of Rb and Sr in the granitic fine-grained rocks in Pingxiang area are complementary,Zr/Hf＜36.70 and Nb/Ta＜5.00.The bimica granites exposed near the mining area also have high rubidium content(average 319.6×10-6),indicating that the highly differentiated granites may cause the enrichment of rubidium and other incompatible elements.
rubidium depositgranitic aplitecause analysisgeological characteristicsPingxiang area
万方数据
维普
