• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Seismological evidence for a mid-mantle discontinuity beneath Hawaii and Iceland
【24h】

Seismological evidence for a mid-mantle discontinuity beneath Hawaii and Iceland

机译：夏威夷和冰岛下方中幔幔间断的地震学证据

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

Receive functions derived from body waves recorded in Iceland and on the Hawaiian Islands reveal a seismic velocity discontinuity at about 1050 kn depth beneath the two regions of presumed mantle upwelling. the waveforms of the converted phases from the mid-mantle discontinuity indicate a velocity increase with depth. The lack of consistent scattering found n recent systematic searches for seismic boundaries in the middle mantle argues against a globally continuous, sub-horizontal mineralogical phase transition near 1000 km depth. the sense of the velocity change at the mind-mantle discontinuity beneath the two hotspots is consistent with geodynamic models in which the mantle has distinct chemical reservoirs and the materials beneath the compositional boundary in these areas is more silicon-rich than the overlying mantle, although the possibility of a yet-unknown phase transition particular to mantle plume material cannot be ruled out.
机译：接收自冰岛和夏威夷群岛上记录的体波的函数，表明在假定的地幔上升流的两个区域下方约1050 kn处的地震速度不连续。地幔中部不连续面的相变波形表明速度随深度增加。在最近一次系统搜索中地幔的地震边界时发现缺乏一致的散射，这与在1000 km深度附近的全球连续，亚水平的矿物学相变相反。在两个热点下方的地幔不连续处，速度变化的感觉与地球动力学模型相一致，在该模型中，地幔具有独特的化学储层，并且在这些区域的组成边界之下的物质比上覆的地幔富含硅。不能排除特别是地幔柱材料发生未知相变的可能性。

著录项

相似文献

  • 外文文献
  • 中文文献
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