近日，中国科学技术大学吴忠庆团队研报道了水致地幔翻转解释太古宙的高古地磁强度。2025年12月23日出版的《国家科学评论》杂志发表了这项成果。

含水的基底岩浆洋在演化过程中引发的地幔翻转，可以很好地解释太古宙众多令人费解的现象，包括大陆的形成以及太古宙-元古宙界线。地幔翻转期间，炽热的基底岩浆洋上涌会剧烈影响核幔边界的热状态及地磁场。

研究组通过模拟核幔边界的热演化过程，探究地幔翻转对地磁场的影响。研究结果表明，地幔翻转会显著加速地核冷却，并增加跨越核幔边界的热流。这种增强的热流能够强化地磁场，从而很好地解释约3.5至2.5?Ga期间记录的高古地磁强度。强烈的地球发电机活动与太古宙大陆的形成，共同描绘出水诱发地幔翻转的演化图景。

附：英文原文

Title: Water-Induced Mantle Overturn Explains High Archean Paleointensities

Author: Wang, Dong, Wu, Zhongqing

Issue&Volume: 2025-12-23

Abstract: As a consequence of the evolution of the water-bearing basal magma ocean, water-induced mantle overturn can suitably explain many puzzling observations in the Archean, including the formation of continents and the Archean–Proterozoic boundary. The upwelling of the hot basal magma ocean during mantle overturn drastically affects the thermal state of the core–mantle boundary and geomagnetic field. We model the thermal evolution of the core–mantle boundary to investigate the effects of mantle overturn on the geomagnetic field. Our results demonstrate that mantle overturn substantially accelerates core cooling and increases the heat flow across the core–mantle boundary. Such enhanced heat flow would have strengthened the geomagnetic field, which explains well the high paleointensity records from approximately 3.5 to 2.5 Ga. The strong geodynamo and formation of Archean continents generate a concordant picture on the evolution of water-induced mantle overturn.

DOI: 10.1093/nsr/nwaf578

Source: https://academic.oup.com/nsr/advance-article/doi/10.1093/nsr/nwaf578/8402922searchresult=1