陕西丹凤秦岭群石榴子石变质结晶动力学研究

A STUDY ON THE KINETICS OF METAMORPHIC CRYSTALLIZATION OF GARNET IN THE QINL ING GROUP, DANFENG, THAANXI, CHINA

本文运用晶体大小分布理论对陕西丹凤秦岭群石榴子石进行了变质结晶动力学的研究,通过对石榴子石在岩石中出现的频率及其大小值的系统测定,有关变质结晶动力学的分析计算,最终得出了丹凤秦岭群石榴子石的变质结晶初始成核密度、成核速度、晶体生长速度、生长时间及冷却过程中体积转移量等诸动力学要素,并从晶体大小分布研究中获得了多期复杂变质这一与地质事实一致的重要地质信息。

In this study the crystal size distribution theory (CSD) is applied to research on the kinetics of metamorphic crystallization of garnet in the Qinling Group. Statistical data on the frequency of occurrence of garnet in the rocks and crystal size distribution, in conjunction with the calculation and analysis of metamorphic crystallization kinetics, permit us to obtain such kinetical factors as initial crystal nucelation density, uncleation rate, crystal growth rate and time, and volume change during cooling. In addition the study of crystal size distribution has provided important information about the consistency of geological thermal events with previous geological studies.