Lasting mantle scars lead to perennial plate tectonics.
Lasting mantle scars lead to perennial plate tectonics.
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DOI：
10.1038/ncomms11834
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发表时间：
2016-06-10
影响因子：
16.6
通讯作者：
Stephenson R
中科院分区：
文献类型：
--
作者：
Heron PJ;Pysklywec RN;Stephenson R
大洋中脊、转换断层、俯冲和大陆碰撞形成了传统的板块构造理论来解释板块边界的非刚性行为。然而，该理论并没有直接解释板内变形和地震活动所涉及的过程。最近，岩石圈的损伤结构与板块构造的起源有关。尽管地震成像表明遗传性地幔岩石圈异质性普遍存在，但它们在板块构造中的作用却很少被考虑。在这里，我们表明深层岩石圈异常可以主导激活板块内部构造的浅层地质特征。在数值实验中，我们发现通过板块构造过程冻结到地幔岩石圈中的结构可以表现为在远场压缩强迫下重新激活的准板块边界。原岩石圈板块因早期缝合而伤痕累累的板内位置可能是潜在板块边界仍然存在的区域，并且板块构造过程被表达为“常年”现象。 板内变形的原因仍然缺乏约束。海伦等人。使用数值模型表明古代板块构造过程产生地幔岩石圈结构，这些结构可能被重新激活以产生板内变形。
Mid-ocean ridges, transform faults, subduction and continental collisions form the conventional theory of plate tectonics to explain non-rigid behaviour at plate boundaries. However, the theory does not explain directly the processes involved in intraplate deformation and seismicity. Recently, damage structures in the lithosphere have been linked to the origin of plate tectonics. Despite seismological imaging suggesting that inherited mantle lithosphere heterogeneities are ubiquitous, their plate tectonic role is rarely considered. Here we show that deep lithospheric anomalies can dominate shallow geological features in activating tectonics in plate interiors. In numerical experiments, we found that structures frozen into the mantle lithosphere through plate tectonic processes can behave as quasi-plate boundaries reactivated under far-field compressional forcing. Intraplate locations where proto-lithospheric plates have been scarred by earlier suturing could be regions where latent plate boundaries remain, and where plate tectonics processes are expressed as a ‘perennial' phenomenon. The causes of intraplate deformation remain poorly constrained. Heron et al. use numerical models to show that ancient plate tectonic processes produce mantle lithosphere structures that may be reactivated to generate intraplate deformation.