四川冕宁钙-铈氟碳酸盐矿物中的晶畴结构  

Domain Structures in Calcium-Cerium Fluorocarbonate Minerals, Mianning County, Sichuan Province

作　　者：吴秀玲[1] 孟大维[1] 牟涛[1] 潘兆橹[1] 

机构地区：[1]中国地质大学测试中心

出　　处：《中国稀土学报》2000年第2期165-168,共4页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金!( 4 9872 0 69和 4910 2 0 19);中国地质大学 (北京 )矿物岩石材料应用开发国家专业实验室开放研究基金!( 980 0 2

摘　　要：用透射电子显微技术研究了四川冕宁霓石碱性花岗岩中的钙 铈氟碳酸盐矿物系列的晶畴结构 ,发现该系列矿物中的晶畴结构类型较为复杂 ,其中包括 :氟碳钙铈矿 (BS) 6R2 多型和B2 S规则混层结构 6R多型的 {0 0 0l}微双晶畴及B2 S 2H多型结构中的反相畴。反相畴是由于晶格沿 [0 0 0l]方向产生 0 .471nm的位移 ,即沿 {0 0 0l}面的层错引起。在混层结构的畴区内确定了B4S2 型规则混层结构的 3R新多型 ,并观察到有序混层结构中存在无序结构微畴及在无序结构中的有序混层结构微畴。The domain structures in calcium cerium fluorocarbonate mineral series from a rare earth mineral deposit within an aegirine alkali granite massif in Mianning County, Sichuan Province, China, were studied by means of transmission electron microscopy (TEM). Complex, many and varied categories of domain structure in the mineral series were observed and investigated, including the microtwin domains of parisite 6R 2 and B 2S 6R, the antiphase domains of B 2S 2H. The results show that the antiphase domains are formed by the displacement of crystal lattice in c * direction and the displacement is 0.471nm, that is fault along crystal plane ｛000l｝. A new polytype (B 4S 2 3R) of regular mixed layer structure with B 4S 2 type is found in the domain region of mixed layer structure. There are disordered micro domains in the ordered mixed layer structures and the ordered micro domains in the disordered structures.

关 键 词：稀土 钙-铈氟碳酸盐矿物 晶畴结构 

分 类 号：P578.5[天文地球—矿物学] P573[天文地球—地质学]