在MgSiO3中经过矿石的阶段过渡
Motohiko Murakami1, Kei Hirose, Katsuyuki Kawamura
1Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan. mmurakam@geo.titech.ac.jp
Science (New York, N.Y.)
|April 10, 2004
概括
酸矿转化为一个新的高压阶段在地球的核心-地幔边界附近. 这种矿后的过渡很可能解释了D"的地震不连续性,并导致了地震异构性.
科学领域:
- 地质物理学 地质物理学
- 矿物物理 矿物物理
- 高压科学科学 高压科学
背景情况:
- 地球的核心-地幔边界 (CMB) 区域表现出复杂的地震结构,包括D"地震不连续性.
- 了解CMB条件下的矿物阶段及其特性对于解释地震数据至关重要.
研究的目的:
- 为了研究酸 (MgSiO3) 矿的高压和高温行为.
- 为了确定与D"地震不连续性相关的潜在相位过渡.
主要方法:
- 在MgSiO3上进行了现场X射线衍射测量,其压力超过125 GPa,温度为2500 K.
- 实验条件模拟了在地球核心-地幔边界发现的条件.
主要成果:
- MgSiO3矿转化为一个新的高压阶段,超过125 GPa和2500 K.
- 这一新阶段表现出堆叠的SiO6八面体板结构和密度增加1.01.2%.
- 过渡发生在接近2700公里的深度,靠近地幔底部.
结论:
- 在MgSiO3中观察到的矿后阶段过渡是对D"地震不连续性起源的合理解释.
- 新阶段具有很大的弹性异构和切割流中首选方向的潜力,可以在D"层以下产生强大的地震异构.
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