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大量研究表明 ,水 岩反应过程中REE表现为不同程度的活动性。富含各种络合剂的流体与岩石反应时可活化REE ;水 岩反应过程中既可出现HREE优先活化 ,亦可出现LREE优先活化 ,这取决于流体的化学成分、Eh、pH以及REE的寄主相及其赋存状态 ;水 岩反应过程中的可出现Eu的正异常、负异常或无异常 ,其主要影响因素是流体的氧化 还原状态 ;单矿物组合的REE行为受制于矿物的晶体化学性质 ,而多矿物组合则取决于体系的Eh、pH、水 /岩值和络合剂浓度等 ,目前亟待开展实验工作有 :①流体的化学组成及其性质 ,尤其是各种络合剂的活度及其对REE的活动性的影响 ;②REE在热液矿物与流体相之间的分异机制及控制因素 ;③T、P、pH、Eh和水 /岩比如何影响REE的活动性和分异行为。
Numerous studies have shown that REE behaves in varying degrees of activity during the water-rock reaction. REE can be activated when fluids rich in various complexing agents react with rocks. Preferential activation of HREE or preferential activation of LREE may occur during the reaction of water and rock, depending on the chemical composition of the fluid, Eh, pH, and REE Host phase and its occurrence state; the positive and negative anomalies of Eu can occur in the process of water-rock reaction, the main influencing factor is the redox state of the fluid; the REE behavior of single mineral combination is subject to the crystal chemistry Nature, and multi-mineral combination depends on the system Eh, pH, water / rock value and complexing agent concentration, the urgent need to carry out experimental work are: ① the chemical composition of the fluid and its nature, especially the various complexing agent Activity and their effect on the activity of REE; (2) the differentiation mechanism and controlling factors ofREE in the hydrothermal mineral and fluid phase; (3) how T, P, pH, Eh and water / rock ratio affect the activity and fraction Different behavior.