近日，加拿大多伦多大学Russell N. Pysklywec团队报道了碰撞后的板块断裂和俯冲极性反转速度非常快。该项研究成果发表在2025年8月13日出版的《地质学》杂志上。

板块断裂和极性反转是经常发生的与俯冲作用有关的构造事件。例如，西阿尔卑斯和昂通爪哇就是板块断裂和极性反转的典型例子。足够数量的高质量地质实例表明时间范围很短（平均为6毫秒）。在碰撞事件后，板块断裂和极性反转。另一方面，先前的数值模拟研究表明，这些碰撞断裂事件的时间平均在7.5到23.2毫秒之间。

研究组将17个古代和现代俯冲带的地质观测与一套数值实验相协调。通过综合地质证据及其地球动力学模型，研究组提出大多数板块断裂和极性反转过程在地质上是快速的（平均6毫秒），这与当前的想法相反。

附：英文原文

Title: Slab break-off and subduction polarity reversal after collision can be very fast

Author: Erkan Gün, Philip J. Heron, Russell N. Pysklywec

Issue&Volume: 2025-08-13

Abstract: Slab break-off and polarity reversal are tectonic events that often occur in relation to the subduction process. For example, the Western Alps and Ontong Java are high profile cases of slab break-off and polarity reversal. A sufficient number of high-quality geological examples indicate a very short time frame (an average of <6 m.y.) for slab break-off and polarity reversal after a collisional event. On the other hand, previous numerical modeling studies propose the timing of these collision break-off events to be on an average time scale between 7.5 and 23.2 m.y. This study reconciles the geological observations from 17 ancient and contemporary subduction zones with a suite of numerical experiments. By synthesizing geological evidence and our geodynamic models, we propose that the majority of slab break-off and polarity reversal processes can be geologically fast (average <6 m.y.), contrary to current thinking.

DOI: 10.1130/G52507.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G52507.1/660498/Slab-break-off-and-subduction-polarity-reversal