摘要
对采自我国南方燕山期五里亭花岗岩体中的褐帘石,经偏光显徽镜、电子探针仪、差热仪、X射线等方法进行分析得出,该矿物为变生褐帘石。加热800℃,850℃,950℃,970℃,1100℃退火系列样品的X射线粉晶数据分析得出:1.变生褐帘石X射线粉晶分析的最宜加热温度为800—850℃;2.加热至970℃的退火样品,褐帘石已分解为方铈石、赤铁矿、钙长石,加热到1100℃,褐帘石已渐消失,方铈石、钙长石和赤铁矿成为主要矿物相。
The metamict allanite from South China is studied by using microscopy, DTA and X-ray powder analyses. The results show that the annealed sample heated to 800 --850^(3 gives the standard X-ray data of allanite, and the sample heated over 850℃ is decomposed. The annealed sample heated to 970℃ is decomposed into cerianite, hematite, anorthite and small amount of allanite and other minerals. From the X-ray powder data the reaction process may be expressed as: 2 (Ca, Ce) (Fe)(Al, Fe)_2 O·OH(Si_2O_7)(SiO_4)■ 2CeO_2+2CaAl_2Si_2O_8+6Fe_2O_3+2SiO_2. X-ray powder data of the anneaied allanite heated to 11000(2 show that the allanite was decomposed into dominant cerianite, hematite, and anorthite, but allanite disappeared.
出处
《地质科学》
CAS
CSCD
北大核心
1992年第4期399-403,共5页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家自然科学基金(49070085)的部分成果
关键词
花岗岩
褐帘石
加热
研究
granite, metamict allanite, X-ray powder analysis, cerianite, hematite, anorthite
