Work

Intraplate volcanism induced by magmatic solitary waves ascending from the mantle transition zone

Year: 2025

Type: article

Abstract: Scattered non-age-progressive intraplate volcanism (SIV) is globally widespread, yet its underlying mechanism remains poorly understood. A hypothesis posits that the magma feeding this volcanism originates from hydrous melting of upwelling mantle from the mantle transition zone (MTZ), driven by subduction-induced return flow. Here, we test this hypothesis using a two-dimensional numerical model of passive MTZ upwelling that incorporates magma formation and transport based on two-phase flow theory. Our results show that dehydration of the upwelling MTZ mantle at the 410 km discontinuity initially forms a large, horizontally elongated magmatic solitary wave. Driven by buoyancy, this wave ascends and subsequently disintegrates into multiple, smaller (~10–20 km in diameter) magmatic solitary waves. These discrete waves ascend randomly through the asthenosphere in a process akin to “mantle rain,” reaching the lithosphere base in ~10 m.y. Our model provides a viable explanation for SIV.

Source: Geology

DOI: 10.1130/g53800.1

Authors: Changyeol Lee, Nestor G. Cerpa, Jaehoon Lee, Minyoung Huh

Institutions: Pohang University of Science and Technology, Yonsei University, Centre National de la Recherche Scientifique, Université de Montpellier, Géosciences Montpellier

Language: English

Topic: High-pressure geophysics and materials

Subfield: Geophysics

Field: Earth and Planetary Sciences

Domain: Physical Sciences

Open Access status: bronze

Funders: National Research Foundation, Ministry of Oceans and Fisheries, National Research Foundation of Korea

Award: G1853983210