Small Watershed In Southern Jiangxi Dissolved Geochemical Characteristics Of The State Of Rare Earth Elements

The distribution and fractionation of Rare Earth Element (REEs) are the base for their usage as trace elements. Many articles have reported the REE geochemistry in the soil and plant, while there are few reports of the REE geochemistry in the waters, especially in the small basin waters. Since the dissolved REE (DREE) is more sensitive to the variation of conditions in the waters than other phases, and it is also the effective tracer. So the DREE geochemistry is the key to trace the hydrology and the solid-liquid interaction.This text aims at the upper reaches of Ganjiang River in the southern Jiangxi Province as the research object, analyzes the distribution and fractionation of dissolved Rare Earth Element (DREE) in the water, and discusses the origins of the water DREE signatures. The results are showed as follows: (1) The distribution and fractionation of the DREE in the small basin water in southern Jiangxi province reflect the character of the the weathering source, while the reports of main rivers in the world are probably the the result of mixing and uniforming of many distributaries. (2) If the bore-sized disc filters are reduced, the DREE content should decrease obviously, but the shale normalized patterns totally show weak variety, with the degree of Eu-anormaly changing greatly, which suggests that the particle adsorption is important to Eu. (3) In Branch C area, the heavy REE (HREE) enriched shale normalized patterns of DREE, resemble a characteristic of REE in the weathering profiles, meanwhile, the fractionation of REE during the weathering process and the complexation of the REE with organic matters, also contribute to the patterns. The middle REE (MREE) enriched patterns in the mainstream area most possibly come from the result of solid-liquid interactions and artificial interference. (4) The negative Ce anomalies in the valley of southern Jiangxi are mainly caused by the Ce oxygenation in the weathering basin and in the surface water. The positive Eu anomalies in Branches A and B areas are relevant to preferential solution of MREE, and Eu-enriching minerals may also contribute to it. The negative Eu anomalies in Branch C area mainly reflect the characteristics of the weathering basin affected by rare earth mineral. The negative Eu anomalies in the mainstream area is possibly relative to anthropogenic factors.