Quantitative Description Of Trace Element Weathering Behaviors

An empirical equation was presented with three weathering indices,WIG,Al₂O₃/Ti and K₂O/SiO₂ to quantitatively describe the behaviors of trace element during wreathing?Gong et al.,2015?aslg?c?=A×?120-WIG?+B×lg?Al₂O₃/Ti?+C×lg?K₂O/SiO₂?+DThe empirical equation can be used to describe the background value of the relevant elements in the sample under the influence of only in weathering.Since the original text only collected 13 weathering profile samples from different regions of the country when the equation was fitted,the effects used in other areas were not tested.Based on the study of the weathering profile,soil and stream sediment samples of granite in Chizhou Huayuangong,Anhui Province,it is found that the application effect of the original 29 trace element empirical equations in the study area,only W,Sn,Zn and Be is better,the measured values of other elements deviate greatly from the calculated values,indicating that the coefficients of the original empirical equations are not applicable in the study area.Based on the weathering profile samples collected in the study area,soil samples,stream sediment samples and sieving samples of three samples,the empirical equation coefficients of the remaining 25 trace elements are re-fitted.As?Au?B?Bi?Cd?Co?Cr?Cu?Hg?Mo?Nb?Ni?Pb?Sb?Sr?Th?V?Y?Zr are fitted well,the logarithmic error range between there measured values and the calculated values are around 0.3.The fitting results of the other 6 elements,Ag,Ba,F,La,Li and U all showed a strong correlation only with Al₂O₃/Ti,but the study area was all granite,which was inconsistent with the theory of the empirical equations of trace elements,also the use effect is not good.It is found that there are quadratic function relationships between Ag and WIG in the study area,so the two times of WIG are added to the original equation model and the equation coefficients of Ag are fitted,and the effect is better in the study area.