岩石矿物学杂志2026，Vol.45Issue(1)：113-122,10.DOI:10.20086/j.cnki.yskw.2026.5030
稀土碳酸盐矿物成因探索
Research on formation of rare earth carbonates:Experimental study on replacement reaction of calcite
摘要
Abstract
Mineral replacement reactions play an important role in the rare earth mineralization process of carbon-atites,which reflect changes in the environmental conditions or fluid composition during the evolution of the sys-tem.Due to the close ionic size range of rare earth element ions and calcium ions,calcite can be transformed into rare earth carbonates under the action of hydrothermal solution containing rare earth element.Under the combined action of Ce3+and H2O,calcite can be gradually transformed into lanthanite[Ce2(CO3)3·8 H2O](room tempera-ture)→ calcioancylite[CaCe(CO3)2(OH)·H2O](70～110℃)→ hydrobastnäsite[Ce(CO3)(OH)](150～165℃)→cerianite(CeO2)(200～250℃).The different binding forms of water in rare earth carbonate minerals can effectively reflect the ambient temperature.The co-participation of F-,Ce3+and H2O can accelerate calcite to transform to rare earth minerals.Calcite can be converted into stable bastnäsite phase at room temperature,but flu-orine is not easy to replace the hydroxy occupation in calcioancylite for further transformation into bastnäsite.F-,OH-and CO32-are important ligands responsible for the binding of rare earth elements,and play an important role in the migration,transformation and fixation of REEs in hydrothermal environment.关键词
方解石/稀土/碳酸盐/热液/矿物成因Key words
calcite/rare earth/carbonate/fluid/mineral genesis分类
天文与地球科学引用本文复制引用
范晨子,曾普胜..稀土碳酸盐矿物成因探索[J].岩石矿物学杂志,2026,45(1):113-122,10.基金项目
中国地质科学院基本科研业务费项目(JKYZD202324) （JKYZD202324）
中国地质调查项目(DD20242852) Fundamental Research Project of Chinese Academy of Geological Sciences(JKYZD202324) （DD20242852）
China Geological Survey Project(DD20242852) （DD20242852）
