【摘要】 本文研究了氟碳铈矿的形成条件及Lr、Pr、Nd、Sm……Lu及Y的氟碳酸盐形成氟碳铈矿结构的可能性。主要实验结果及讨论如下: 1.氟碳铈矿的形成条件范围很宽,在常温到400℃,常压到1000bar,溶液pH从6.7到11.0的范围内均可形成。 2。氟碳铈矿与独居石有类似的形成条件,控制它们形成量的因素是氟与磷的比例。 3.La—DY的氟碳酸盐矿物能够从成矿溶液中直接形成,而Ho—Lu的则不能。 4.氟碳铈矿的晶胞参数与成矿溶液性质有一定的关系,在碱性溶液中合成的氟碳铈矿的晶胞要比在中性溶液中合成的大些。更多还原

【Abstract】 Dealt with in this paper are the conditions of formation of bastnasite andthe possibility for fluor-carbonates of La, Pr, Nd, Sm,… Lu and Y to exhi-bit bastnasite structure. The main experimental results are presented as follows:1. The conditions of formation of bastnasite are characterized by widetemperature (normal to 400℃), pressure (normal to 1 k bar), and pH (ofthe solutions 6.7 to 11.0) ranges. That is the reason why bastnasite is ofextensive occurrence in nature. The upper temperature limit of bastnasite is400℃, from which we can deduce the temperature range of REE mineral asso-ciation.2. Bastnasite and monazite are formed under similar conditions, and theratio of fluorine to phosphorus is a factor controlling the quantity of forma-tion of the above minerals.3. Fluor-carbonate minerals of La-Dy can be formed directly from ore-solutions, but those of Ho-Lu and Y can not.4. Some relationship exists between the unit-cell parameters of bastnasiteand the nature of ore-solutions.The crystal cell of bastnasite synthesized inalkaline solution is much larger than that synthesized in neutral solution.更多还原