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变质岩研究工作中一个重要课题是如何确定它的P-T条件,而关键的问题是搞清楚不同变质带的压力类型(或相系)。许多研究工作指出,变质岩中自云母-绿鳞石固溶体成分以及白云母晶胞参数中的b_0和c_0均随环境条件的影响而改变,可以用来作为变质作用温度或压力的指示剂。本文根据对西藏九个变质白云母样品的X射线衍射以及化学
An important issue in the study of metamorphic rocks is how to determine its P-T conditions. The key issue is to find out the type of pressure (or facies) in different metamorphic zones. Many studies indicate that the b_0 and c_0 of the self-mica-greenstone solid solution in metamorphic rocks and the parameters of the unit cell of the muscovite change with the influence of environmental conditions and can be used as an indicator of the temperature or pressure of metamorphism. Based on the X-ray diffraction and chemistry of nine metamorphic muscovite samples from Tibet