近日，中国地质大学刘金高团队研究了长时间的环大陆俯冲：克拉通破坏机制和克拉通寿命的理论基础。该项研究成果发表在2025年8月7日出版的《美国科学院院刊》杂志上。

大陆的演变是由长期存在的克拉通的生长和破坏所决定的，克拉通是大陆稳定的核心。克拉通的破坏过程是有争议的，因为大多数被调用的机制在地球历史上经常发生，这使得保存数十亿年的克拉通成为问题。

研究组通过提出一个从东亚克拉通的高分辨率航空和船载磁数据中获得的克拉通尺度分析信号振幅模型来解决这个问题。岩浆、磁场和盆地历史约束表明，自古生代以来，华北克拉通东部经历了一个独特的环克拉通俯冲和随后的碰撞组合，经历了聚焦性的弱化、增厚和地幔岩石圈的灾难性破坏。而邻近的华南克拉通则没有受到这样的冲击，地幔根也没有受到破坏。克拉通的长期生存可能源于不经常发生的持续的克拉通周围俯冲或碰撞过程，这些过程能够破坏其岩石圈根部的稳定。

附：英文原文

Title: Protracted circum-continent subduction: A mechanism for craton destruction and a rationale for craton longevity

Author: Xu, Xi, Zuza, Andrew V., Liu, Lijun, Zhu, Weilin, Sun, Yanyun, Wang, Baodi, Kuang, Xingtao, Han, Song, Zhang, Xuanjie, Zhang, Wan, Fu, Xiaowei, Pearson, D. Graham, Liu, Jingao

Issue&Volume: 2025-8-7

Abstract: The evolution of continents is shaped by the growth and destruction of long-lived cratons, which serve as their stable cores. Processes for craton destruction are controversial because most invoked mechanisms occur frequently throughout Earth history, making the preservation of cratons for billions of years problematic. Here, we address this issue by presenting a crustal-scale analytical signal-amplitude model obtained from high-resolution airborne and shipborne magnetic data across cratons within East Asia. Magmatic, magnetic, and basin-history constraints show that the eastern North China craton experienced focused weakening, thickening, and catastrophic destruction of its mantle lithosphere due to a unique combination of circum-craton subduction and subsequent collision since the Paleozoic. By contrast, the adjacent South China craton was not impacted in this way, and thus, its mantle root was spared from destruction. The long-term survival of cratons may stem from the infrequent occurrence of sustained circum-cratonic subduction or collisional processes capable of destabilizing their lithospheric roots.

DOI: 10.1073/pnas.2502618122

Source: https://www.pnas.org/doi/abs/10.1073/pnas.2502618122