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橄榄石的后尖晶石相变研究进展
Advances in the Study of Post-Spinel Phase Transformation of Olivine
【摘要】 橄榄石在高温高压条件下分解为钙钛矿和方镁石(后尖晶石相变),这是地幔中最为重要的相变之一,被认为是660KM地震波速间断面的成因。现今所取得的重要进展表现在3个方面:①MG2SI O4的后尖晶石相变的原位X射线高温高压实验研究;②水、AL2O3以及压力标尺对后尖晶石相变的影响效应;③下地幔条件下地幔岩组分中的后尖晶石相变。在对研究进展进行概述的基础上,对目前存在的问题进行了分析并提出未来可能的研究方向。
【Abstract】 Ringwoodite, one of the high-pressure and high-temperature forms of olivine, can be decomposed into perovskite and periclase (post-spinel phase transformation). The process, which seems to be one of the most important transformations in the Earth′s mantle, is believed to be the cause of the 660-km seismic discontinuity dividing the mantle into upper and lower parts. The advances made in the researches are shown in three aspects: ① post-spinel phase transformation of Mg2SiO4 at high pressure and high temperature using in situ X-ray diffraction; ② the effects of H2O, Al2O3 and equation of state of gold on the post-spinel phase transformation; ③ the post-spinel phase transformation in peridotite under lower mantle conditions. On the basis of a summary of recent advances, this paper analyzes the existing problems and indicates possible directions for further studies.
- 【文献出处】 地球学报 ,Acta Geoscientica Sinica , 编辑部邮箱 ,2006年01期
- 【分类号】P578
- 【被引频次】3
- 【下载频次】257