Role of sulfate in the transport and enrichment of REE in hydrothermal systems
Role of sulfate in the transport and enrichment of REE in hydrothermal systems
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DOI：
10.1016/j.epsl.2021.117068
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发表时间：
2021-09
影响因子：
5.3
通讯作者：
Y. Wan;Xiaolin Wang;I. Chou;Xiaochun Li
中科院分区：
文献类型：
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作者：
Y. Wan;Xiaolin Wang;I. Chou;Xiaochun Li
硫酸盐是一些世界级稀土矿床成矿流体中常见的重要组分。然而，硫酸盐在稀土元素迁移和矿化过程中的作用仍不清楚，需要进一步研究。本文在一系列实验的基础上，提出了液-液不混溶是热液流体中稀土元素富集的一种可能机制。稀土元素被大大集中到分离的浓液相，而剩余的轻液相中的稀土元素被耗尽。原位拉曼光谱分析表征了更复杂的REE 3+-SO 4 2−络合物和一些硫酸氢盐物种，以及已记录的REESO 4+和REE（SO 4）2−;新提出的硫酸盐物种可以在> 200° C下迁移总REE的三分之一。因此，在以往的研究中低估了硫酸盐的运输能力。总的来说，硫酸盐的存在可以显着的稀土矿化液施肥。
Sulfate is a common and important component in the mineralizing fluids of some world-class rare earth element (REE) deposits. However, the roles of sulfate during the transport and mineralization of REEs remain unclear and need further investigation. In this study, liquid–liquid immiscibility is proposed to be a potential mechanism for the enrichment of REE in hydrothermal fluids based on a series of experiments. REEs were considerably concentrated into the separated dense liquid phase, whereas the remaining light liquid phase was depleted in REEs. In situ Raman spectroscopic analyses characterized more complicated REE 3+-SO 4 2− complexes and some bisulfate species in addition to the documented REESO 4+ and REE (SO 4) 2−; the newly proposed sulfate species can transport one third of the total REEs at> 200° C. Therefore, the transport capacity of sulfate was underestimated in previous studies. Overall, the presence of sulfate can significantly fertilize the REE-mineralizing fluids.