韩国江原大学Sung-Joon Chang研究团队，报道了由卡洛琳羽流（西太平洋）提供的双边软流圈流动。2024年12月19日出版的《地质学》发表了这项成果。

据介绍，地幔柱与板块构造的相互作用通常通过热点和相应的海山链来说明，这些热点和海山链表现出与板块绝对运动一致的年龄进展。然而，西太平洋卡洛琳海山链呈现出模糊的特征，挑战了经典的热点假说。

以波形层析成像为主题，通过拟合体波和面波，研究人员推导出卡罗琳板块周围的s波速度和径向各向异性模型。

他们的发现揭示了在卡洛琳海山链下的软流圈中有一个细长的低速异常，伴随着正的径向各向异性。该异常与链中部以东的垂直低速异常有关，表明由卡罗琳羽流供给的双边软流圈流动。

这一机制可以解释加罗林群岛的年龄重叠和长期的火山活动。研究人员提出俯冲板块作为屏障，将软流圈沿薄岩石圈两侧重新导向。这些观测结果为板块构造和地幔柱之间的相互作用提供了新的线索。

附：英文原文

Title: Bilateral asthenospheric flow fed by the Caroline plume (western Pacific Ocean)

Author: Ji-hoon Park, Sung-Joon Chang

Issue&Volume: 2024-12-19

Abstract: The interaction of mantle plumes with plate tectonics is typically illustrated by hotspots and corresponding seamount chains, which exhibit age progression in line with absolute plate motions. However, the Caroline seamount chain in the western Pacific Ocean presents ambiguous features that challenge the classical hotspot hypothesis. We used waveform tomography to derive S-wave velocity and radial anisotropy models around the Caroline plate by fitting body and surface waves. Our findings reveal an elongated low-velocity anomaly in the asthenosphere beneath the Caroline seamount chain, accompanied by positive radial anisotropy. This anomaly is associated with a vertical low-velocity anomaly east of the middle of the chain, suggesting bilateral asthenospheric flow fed by the Caroline plume. This mechanism could explain age overlapping and prolonged volcanic activities in the Caroline Islands. We propose that a subducting slab acts as a barrier, redirecting the asthenospheric flow along thin lithosphere bilaterally. These observations shed new light on the interplay between plate tectonics and mantle plumes.

DOI: 10.1130/G52680.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G52680.1/650897/Bilateral-asthenospheric-flow-fed-by-the-Caroline