论文部分内容阅读
利用高压原位同步辐射X射线衍射和衍射谱宽的分析,测量了地幔主要矿物橄榄石(olivine,α相)、卫思里石(wadsleyite,β相)、林伍德石(ringwoodite,γ相)及钙钛矿相(perovskite)高温高压下的流变强度.实验结果证明,上地幔和过渡层的矿物与下地幔矿物有非常不同的特点.橄榄石、β相和γ相的流变强度都对温度十分敏感,但唯有橄榄石强度在相对低温时就显著减弱,在873K时,橄榄石的强度只有β相的三分之一.与此相反,钙钛矿相的流变强度对温度的敏感度极低.地幔主要矿物流变强度(即矿物积累应力的能力)的特征及其对温度的敏感性可以帮助解释深源地震的发生频率随深度变化的规律.
Using olivine (α phase), wadsleyite (β phase), ringwoodite (γ phase) as the main minerals in the mantle, the X-ray diffraction and diffraction spectrum of high-pressure in situ synchrotron radiation And perovskite at high temperature and high pressure.The experimental results show that the minerals in the upper mantle and the transitional layer have very different characteristics from the lower mantle minerals.The rheological strength of olivine, β-phase and γ-phase Is temperature sensitive, but only significantly decreases in the olivine intensity at relatively low temperatures, with the olivine having a strength of only one-third that of the β phase at 873 K. In contrast, the rheological strength of the perovskite phase increases with temperature The sensitivity of the mantle to the main mineral rheology (that is, the ability of minerals to accumulate stress) and their sensitivity to temperature can help explain the regularity of the frequency of deep-seated earthquakes with depth.