Concentration and Spatial Distribution of REE in Geochemical Transect of Xingmeng Orogenic Belt-North China Craton
Tang Kun
Wang Xueqiu
Chi Qinghua
Zhou Jian
Liu Dongsheng
Liu Hanliang
Abstract：In order to study the regional geochemical composition and lateral spatial variation of the geochemical belt in the North China Craton,rock and regolith samples along a transect across the Xingmeng Orogenic Belt-North China Craton were collected and 14 rare earth element(REE)concentrations were determined.Data of statistical analyses for regolith samples were based on tectonic units,geographical landscape,soil types and rainfall units,and for rock samples were based on tectonic units,rock types,and geologic age units.An average value was calculated from each 1:50 000 map sheet.The spatial distribution of REE concentrations is plotted in figures.The results show that:(1)REEs are depleted in Inner Mongolia semi-arid grassland soils due to less clay minerals in the soils,whereas REEs are enriched in the alluvial plain soils of the northern Jiangsu corresponding to the maximum rainfall zone.(2)In the transect from Honger to Zhangjiakou,REE ratio of soil to rock mostly is less than 1, indicating that the REE is leached in soils or diluted by windblown sand;in the transect from Zhangqiu to Lianyungang,the ra-tio is greater than 1,indicating that the soil REE are enriched in soils.(3)The REE characteristics of the Inner Mongolia block, which belong to the North China Craton,are more similar to those of the Xingmeng Orogenic Belt,affected by the semi-arid sandy soil of Inner Mongolia;The spatial distribution of LREE and HREE with depletion or enrichment in different tectonic units indicates that geochemical properties of REE affecting on the fractionation of REE in the process of soil formation.
Keywords：rare earth elementXingmeng Orogenic Belt-North China Cratongeochemical transectregolithrockspatial dis-tributiongeochemistry
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：17( 655-671 )