Moulin Adrien, Jónsson Sigurjón
King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia.
Institut de Physique Du Globe de Paris, CNRS, UMR 7154, Université Paris Cité, Paris, France.
Sci Rep. 2025 Mar 25;15(1):10249. doi: 10.1038/s41598-025-93942-1.
Formation of new lithosphere at mid-oceanic ridges occurs through magmatic crustal accretion and cooling of the asthenosphere, and is essentially controlled by the spreading-rate, ridge segmentation, and eventual arrival of deeply-sourced hot mantle plumes. Its dependence on long-term inheritance is supposedly weak, except in cases where ridge segmentation is preconditioned by the reactivation of continental weak zones during the rifting phase. Here, we provide the first evidence that pre-rift lithospheric thickness variations constitute another forcing that may transmit influence from past Wilson cycles beyond the stage of continental break-up. This long-term control involves differential redistribution of heat/melt sources along young laterally-confined plume-assisted rifts. This is demonstrated here in the case of the Red Sea from the correlation between on-axis volcano-tectonic patterns, distribution of onshore volcanism, and lithospheric thickness variations of the rifted margins.
大洋中脊新岩石圈的形成是通过岩浆地壳增生和软流圈冷却实现的，其本质上受扩张速率、洋脊分段以及深部地幔热柱最终到来的控制。除了洋脊分段在裂谷作用阶段由大陆薄弱带重新活动作为前提条件的情况外，它对长期继承的依赖可能较弱。在此，我们首次提供证据表明，裂谷前岩石圈厚度变化构成了另一种作用力，这种作用力可能将过去威尔逊旋回的影响传递到大陆裂解阶段之后。这种长期控制涉及热/熔体源沿着年轻的横向受限的羽流辅助裂谷的差异重新分布。这一点在红海的例子中得到了证明，即轴上火山构造模式、陆上火山活动分布与裂谷边缘岩石圈厚度变化之间的相关性。
