| 橄榄石的后尖晶石相变研究进展 |
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| 关键词:olivine post-spinel phase transformation advance |
| 基金项目:国家自然科学基金项目(编号:40402006)，教育部高等学校优秀青年教师教学和科研奖励计划 |
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| Advances in the Study of Post-Spinel Phase Transformation of Olivine |
| 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 Mg_2SiO_4 at high pressure and high temperature using in situ X-ray diffraction; ② the effects of H_2O, Al_2O_3 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. |
| ZHAI Shuang-meng,XIA Bin,CHEN Han-lin.2006.Advances in the Study of Post-Spinel Phase Transformation of Olivine[J].Acta Geoscientica Sinica,27(1):75-79. |
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