...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Geophysical Research Letters >Very low sound velocities in iron-rich (Mg,Fe)O: Implications for the core-mantle boundary region
【24h】

Very low sound velocities in iron-rich (Mg,Fe)O: Implications for the core-mantle boundary region

机译：富铁（Mg，Fe）O中的声速非常低：对核心-地幔边界区域的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The sound velocities of (Mg_(.16)Fe_(.84))O have been measured to 121 GPa at ambient temperature using nuclear resonant inelastic X-ray scattering. The effect of electronic environment of the iron sites on the sound velocities were tracked in situ using synchrotron Mssbauer spectroscopy. We found the sound velocities of (Mg_(.16)Fe_(.84))O to be much lower than those in other presumed mantle phases at similar conditions, most notably at very high pressures. Conservative estimates of the effect of temperature and dilution on aggregate sound velocities show that only a small amount of iron-rich (Mg,Fe)O can greatly reduce the average sound velocity of an assemblage. We propose that iron-rich (Mg,Fe)O be a source of ultra-low velocity zones. Other properties of this phase, such as enhanced density and dynamic stability, strongly support the presence of iron-rich (Mg,Fe)O in localized patches above the core-mantle boundary.
机译：（Mg _（。16）Fe _（。84））O的声速在室温下使用核共振非弹性X射线散射测量为121 GPa。使用同步加速器Mssbauer光谱原位跟踪铁位电子环境对声速的影响。我们发现，在类似条件下，（Mg _（。16）Fe _（。84））O的声速要比其他假定的地幔相的声速低得多，特别是在非常高的压力下。关于温度和稀释度对总声速的影响的保守估计表明，只有少量的富铁（Mg，Fe）O才能大大降低组件的平均声速。我们建议富铁的（Mg，Fe）O是超低速区的来源。该相的其他特性，例如增强的密度和动态稳定性，强烈支持在芯幔边界上方的局部斑块中富铁（Mg，Fe）O的存在。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号