变生易解石的特性
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P575.6

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国家自然科学基金


Characteristics of Metamict Aeschynites
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    摘要:

    研究了易解石族4个变生矿物样品的物理化学性质,并得出以下五点特性:1.差热曲线特征:没变生的易解石在700-800℃无放热峰,而变生的就有,变生程度越深,放热峰幅度越大;2.易解石变生程度越深,矿物加热处理恢复晶态的温度越高,但不能超过1200℃;3.易解石含放射性元素钍和铀量越高,变生程度越深;4.易解石变生程度与钍和铀的种类有关;5.4个易解石样品的化学成分:ThO2和TiO2、ThO2和Nb2O5、Ce2O3和Nd2O3、TiO2和Nb2O5都呈线型关系。

    Abstract:

    Four samples of aeschynites have been studied, including one Ce-aeschysite, two Nd-aeschynite, and one Y-aeschynite, of which the first three were collected from the Bayan Obo iron and REE deposit in Inner Mongolia and the last from Xihuashan granite in Jiangxi.The present paper deals with characteristics of differential thermal curves of four metamict aeschynite samples and X-ray powder diffraction data of these samples at different temperatures, together with a discussion on linear relations between ThO2 and TiO2, ThO2 and Nb2O5, Ce203 and Nd203, and TiO2 and Nb2O5. From the study it is known that the four metamict aeschynite samples have the following characteristics:(1)so far as differential thermal curves are concerned, there is no exothermal peak at 700-800℃ for aeschynites which suffered no metamictization, but metamict aeschynites do have such a peak, and the higher the metamictization degree, the steeper the peak;(2)the deeper the metamictization, the higher the temperature of heating treatment required for restoring crystal form of the mineral] however, the temperature should not exceed 1200℃,(3)the higher the contents of radioactive elements thorium and uranium in aeschynites, the deeper the metamictization, e.g., No.1 sample (ThO2 5.79%)has suffered higher degree of metamictization than No.2 sample ( ThO2 1.28%),(4)the metamictization degree of aeschynites is related to the variety of thorium and uranium; the Main No.1 (Th02 5.79%)sample, for example, has suffered higher degree of metamictization than Y-aeschynite which contains 10.08% U203.

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陶克捷,张培善,1994,变生易解石的特性[J].岩石矿物学杂志,13(1):67~77.

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