Scholarlink

<p>The occurrence of tectonic plate reorganization events is evident throughout the geologic record and appears to be associated with the cessation of mature and/or initiation of new subduction. Subduction initiation that produced the bend in the Hawaii-Emperor seamount chain resulted in the most recent upheaval of plate motion and engendered dramatic changes in plate velocities. Here, applying a method for identifying plate boundaries in a numerical global mantle convection model, we calculate Euler vector time series of self-consistently generated plates over a period of approximately 144 Myr. During this period, global evolution is characterized by two dominant convergent boundaries and the number of major plates identified varies between 9 and 14. Using a 2 Myr sampling rate to track the histories of three enduring plates that share a common triple junction, we observe a major plate reorganization event occurring over approximately 6-8 Myr. The catalyst for the event is identified as the development of a deep thermal feature intrinsic to internally heated convection. A buildup of heat enveloping a mature mantle downwelling accumulates a buoyancy that resists ongoing plate motion and eventually forces the over-riding plates on a new trajectory.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A rapid tectonic plate reorganization event driven by changes at subduction locations in a mantle convection model

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年9月2日

查看全文
  • Joshua M. Guerrero,
  • Chad W. Fairservice,
  • Pejvak Javaheri,
  • Julian P. Lowman,
  • Paul J. Tackley

摘要

The occurrence of tectonic plate reorganization events is evident throughout the geologic record and appears to be associated with the cessation of mature and/or initiation of new subduction. Subduction initiation that produced the bend in the Hawaii-Emperor seamount chain resulted in the most recent upheaval of plate motion and engendered dramatic changes in plate velocities. Here, applying a method for identifying plate boundaries in a numerical global mantle convection model, we calculate Euler vector time series of self-consistently generated plates over a period of approximately 144 Myr. During this period, global evolution is characterized by two dominant convergent boundaries and the number of major plates identified varies between 9 and 14. Using a 2 Myr sampling rate to track the histories of three enduring plates that share a common triple junction, we observe a major plate reorganization event occurring over approximately 6-8 Myr. The catalyst for the event is identified as the development of a deep thermal feature intrinsic to internally heated convection. A buildup of heat enveloping a mature mantle downwelling accumulates a buoyancy that resists ongoing plate motion and eventually forces the over-riding plates on a new trajectory.