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石英-柯石英
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  quartz-coesite
     Although it has been realized that differential stress has notable influence on this transition, the question whether the condition for quartz-coesite transition are ubiquitous is open because of lacking knowledge on the detail of relevant experiments.
     虽然已经认识到了差应力对石英-柯石英转化有显著影响,但由于缺少对实验细节的了解,对于在差应力条件下石英-柯石英转化的条件是否具有普遍性还缺乏全面的认识。
短句来源
     The Effect of Differential Stress on Quartz-Coesite Transition Pressure
     差应力对石英-柯石英转化压力的影响
短句来源
     Up to now there has been few studies on deformation of quartz in ultra-high rocks and quartz-coesite phase transition at differential stress.
     目前对超高压岩石中石英的变形以及在差应力条件下石英-柯石英的相变研究程度低。
短句来源
     Coesite was produced at certain differential stress conditions below its stability field under static pressure in laboratary, which shows that differential stress has obvious effect on the quartz-coesite transition pressure.
     在差应力条件下出现柯石英的压力远小于静压条件下柯石英稳定存在的压力 ,这表明差应力对石英 -柯石英转化具有显著影响。
短句来源
     According to the forming conditions of coesite, there are two different physical mechanisms for shifting quartz-coesite phase transition boundary to decreased forming pressure at differential stress conditions: the phase transition in semibrittle deformation region due to local shear deformation induced mechanical instability, and the phase transition in plastic flow region due to presence of high dislocation density within highly deformed quartz induced strain instability.
     根据柯石英形成条件 ,石英 -柯石英相变边界向低压方向迁移有两种不同物理机制 :发生在低温半脆性域的相变机制是差应力产生的剪切变形引起应力不稳定 ,而发生在高温塑性域的相变机制是在差应力环境下石英强烈变形产生的高位错密度引起应变不稳定
短句来源
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  “石英-柯石英”译为未确定词的双语例句
     It means that the stress tends to be constant when the curves passes through the yielding point, and the stress does not increase with growing strain, and even strain weakening occurs.
     这表明在差应力存在的条件下,在较低的压力(<2.0GPa)下就有稳定的柯石英出现,所以,差应力对石英-柯石英的相变至少在某些特定条件下有很大的影响,而静岩高压力不是产生柯石英的唯一条件。
短句来源
  相似匹配句对
     Quartz transforms i nto coesite at 3.0 GPa.
     石英在3GPa时转变为柯石英
短句来源
     The Effect of Differential Stress on Quartz-Coesite Transition Pressure
     差应力对石英-石英转化压力的影响
短句来源
     REVIEW ON PHASE TRANSFORMATION OF COESITE-QUARTZ FROM ULTRAHIGH PRESSURE METAMORPHIC ROCKS
     超高压变质岩中柯石英石英相变动力学研究的评述
短句来源
     THE EFFECT OF DIFFERENTIAL STRESS ON THE FORMATION OF ULTRA-HIGH PRESSURE METAMORPHIC ROCKS—Evidence from high temperature-high pressure experiments on quartz-coesite transition
     差应力在超高压变质岩形成过程中的作用——来自石英-石英转化的高温高压实验证据
短句来源
     THE DISCOVERY OF COESITE-BEARING ECLOGITES IN THE DABIE MOUNTAINS
     大别山区含柯石英榴辉岩的发现
短句来源
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  quartz-coesite
TEM investigation of the crystal microstructures in a quartz-coesite assemblage of the western alps
      
Atransmission electron microscope (TEM) study of quartz-coesite inclusions in garnet in crustal rocks from the Western Alps is presented.
      
The calculated α-quartz-coesite transition pressure agrees with the experimental value of ≈2 GPa.
      
The quartz-coesite transition measured in the presence of a silicate liquid and calibration of piston-cylinder apparatus
      
Direct determination of the quartz-coesite transition by in situ X-ray measurements
      
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Coesite has been first discovered in the eclogites and their country rocks -kyanite quartzite in the western area of Tuanma Fault from the Dabie Mountains , Henan province. The mineral assemblage in the eclogites is garnet + omphacite + kyanite+ phengite+quartz (coesite)+rutile. The coesite - bearing eclogites were estimated to be formed at T=610-740℃ , P≥2. 8 GPa. The coesite-bearing eclogites and their country rocks underwent simultaneously ultra - high - pressure metamorphism. They might be produced by subduction...

Coesite has been first discovered in the eclogites and their country rocks -kyanite quartzite in the western area of Tuanma Fault from the Dabie Mountains , Henan province. The mineral assemblage in the eclogites is garnet + omphacite + kyanite+ phengite+quartz (coesite)+rutile. The coesite - bearing eclogites were estimated to be formed at T=610-740℃ , P≥2. 8 GPa. The coesite-bearing eclogites and their country rocks underwent simultaneously ultra - high - pressure metamorphism. They might be produced by subduction to depths of more than 90km during continent - continent collision between Yangtze and the North China cratons. The discovery of coesite -bearing eclogites in this area enlarges the region of coesite-bearing eclogite belt in Central -Eastern China.

团麻断裂以西的河南大别山区榴辉岩及其围岩蓝晶石石英岩中首次发现柯石英。含柯石英榴辉岩的矿物共生组合为石榴石+绿辉石+蓝晶石+多硅白云母+石英(柯石英)+金红石,其形成温压条件为T=610~740℃,P≥2.8 GPa。含柯石英榴辉岩及其围岩同时经历了超高压变质作用,可能由扬子板块向华北板块深俯冲作用形成,俯冲深度可迭90km以上。河南大别山区含柯石英榴辉岩的发现扩大了中国中东部含柯石英榴辉岩带的分布区。

Ultrahigh-pressure(UHP) metamorphism is characterized by both low T/P gradient (about 10 C/km or less) and P-T regime higher than quartz -coesite equilibrium. UHP rocks have been reported so far all from continent-continent colli-sion zones. During the UHP metamorphism, mineral resources, such as diamond, jadeite, kyanite, and rutile, might form.

超高压变质作用是指在地温梯度小于10℃/km条件下发生的高于“石英柯石英”相变线压力的变质作用,一般发生在陆—陆碰撞造山带深部。由于其生成条件特殊,超高压变质岩中存在着金刚石、硬玉、蓝晶石及金红石等潜在的矿产资源。

In this paper, some mineral physics properties of metamorphic SiO2 mineral-coesite arestudied by means of optic microscopy, X - ray micro diffratometer.From observed results, the author attempts to look for useful informahon about forming surroundings,process of hypogene action and minerogenetic action.

对高压变质二氧化硅的典型矿物──柯石英进行了晶体学研究,确定了理想柯石英的结构模型,据此绘出理想柯石英的四元环堆积模拟图并计算出晶胞参数,与实测天然样品的X衍射面网指标经计算所得的晶胞参数对比,估算出高压变质柯石英的受压敏感方位是a轴方向;采用共价配住势模式计算出不同温压条件下键长、键角的变化,探索了柯石英石英相互转变的分子动力学问题,估计出柯石英的相变压力约为3.9GPa,并对石英柯石英的可逆互变的动力学问题进行了解释,这对高压变质二氧化硅矿物的成固和成矿作用的研究具有重要的意义。

 
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