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A PRELIMINARY STUDY ON THE ROLE OF ORGANIC MATTER IN DISSOLUTION, MIGRATION AND CONCENTRATION OF RARE EARTH ELEMENTS IN WEATHERING CRUST OF GRANITES FROM SOUTH CHINA

Chen Zhicheng;Chen Dahui(Guangdong College of Medicine and Pharmacy, Guangzhou) Yu Shouyun; Zhuang Wenming;Hong Huahua、Fu Qunce(Department of Geology, Sun Yatsen University,Guangzhou)  
Experiments demonstrate that there exists organic matter in the weathering crust of granites.The organic matter mainly consists of mono-and di-carbonxylic acids,humic acids and polysaccharides.REE can be dissolved out of parent rocks in the complex form of REE(H2O).The presence of some kinds of matter,especially alphatic acids,may effectively accelerate the dissolution and migration of REE.Complexing reactions and normal hydrolysis,as well as dissolution and retention,coexist during weathering, controlled by pH value.There are REE-organic complexes,which are probably related to long chain fatty acids or humic acids,in the weathering crust. The rare earth elements in active state may bear close relations with polyhydroxy compounds or polysaccharides,as well as with clay minerals.
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