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Abstract Warm and humid climate and gentle hilly topography have provided favourable conditions for the development of the weathering crust of the granite intrusions in the Longnan area, Jiangxi Province. REE is mostly concentrated in an adsorption state in clay in the wholly weathered zone. The rare‐earth minerals enriched in the parent rocks provided the source material for the REE enrichment. Exchangeable REE accounts for 48‐86%. Extraction experiments and stable isotopic study of clay minerals suggest that the downward infiltration of meteoric water and increasing gradient of pH values have played an important role in the enrichment of REE during the progressive weathering. Slight fractionation of individual REE can not change their distribution patterns in the profiles, which are inherited from the parent rocks.
Acta Geologica Sinica (English Edition) – Wiley
Published: Jun 1, 1990
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