α-β石英相变的应变参数计算及其地质意义  

CALCULATION OF THE STRAIN,STRESS AND ELASTIC ENERGY FOR α-β QUARTZ TRANSITION AND ITS GEOLOGICAL SIGNIFICANCE

作　　者：周文戈[1] 谢鸿森[1] 赵志丹[2] 周辉[3] 郭捷[1] 

机构地区：[1]中国科学院地球化学研究所高温高压地球动力学实验室,贵州贵阳550002 [2]中国地质大学(北京)地矿系岩石室,北京100083 [3]北京大学地质系,北京100871

出　　处：《高压物理学报》2002年第4期241-248,共8页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金 (10 0 32 0 40 ;4990 40 0 5 ) ;中国科学院知识创新工程重要方向项目(KJCX2 SW No .3)

摘　　要：利用已有的α和 β石英压缩性、热膨胀性、弹性及相变温度压力资料 ,计算了α—β石英相转变时 ,α和β石英的晶胞参数。依据虎克定律以及高压下 β石英的弹性参数 ,估算了α—β石英相转变时的应变、应力和应变能。结果表明 ,在 0～ 1 .1GPa条件下 ,随着压力升高 ,α—β石英相变的线应变介于 - 0 .0 0 6～ 0 .0 0 5之间 ,体应变介于 - 0 .0 1 6～ 0 .0 1 2之间 ,应力介于 - 0 .46～ 0 .1 4GPa之间 ;应变能介于 96 5～ 2 76 0kJ/m3之间。当压力为 0 .5GPa左右时 ,α—β石英相变的应变、应力和应变能均达到最小值。在此基础上 ,讨论了壳内大规模酸性岩浆活动引起的α—β石英相变对壳内岩石的作用。The variations of the lattice parameters of α- and β-quartz at high pressure and high temperature were calculated with the compressional and thermoelastic properties of α- and β-quartz. Combined the data of α-β quartz transition experiments with the results from calculation, the lattice parameters of α- and β-quartz at their transition pressure and temperature were determined. Then, the strains, stresses and elastic energies for α-β -quartz transformation were evaluated according to Hooke's law. The results indicate that at the pressure of 0-1.1 GPa, the linear strains vary within-0.006-0.005, the volume strains within-0.016-0.012, the stresses within-0.46-0.14 GPa, and the elastic energies within 965-2760 kJ/m3. At about 0.5 GPa, the strains, stresses and elastic energies achieved their minimum values. Based on the calculated results, the effect of the α-β quartz transformation on the wall rock in the crust during the acid magma intrusion is discussed.

关 键 词：计算 地质意义 α-β石英相变 应变 应力 应变能 晶胞参数 高温高压 晶体相变 二氧化硅 SIO2 

分 类 号：O792[理学—晶体学] P58[天文地球—岩石学]