Bilateral Heterogeneity in an Upwelling Mantle via Double Subduction of Oceanic Lithosphere

Abstract

Intraplate-basaltic volcanism was widespread throughout Southeast (SE) Asia during the Cenozoic (Figure 1; Flower et al., 1998). Vietnam is located at the southeastern edge of SE Asia (Figure 1a) and represents the most volcanically active field on the Indochina Peninsula (Figure 1b; Flower et al., 1998). The upwelling of hot asthenospheric materials, revealed by seismic tomography (Huang et al., 2015), is considered to be a primary cause of the volcanism in this region.Lithospheric thinning, induced by the collision of the Indo-Australian plate and Eurasian plate, has long been proposed as a cause of asthenospheric upwelling (

Dynamic Evolution of Back‐Arc Basins Affected by Double Subduction

“…The intraplate volcanisms induced by double subduction are also suggested in Southeast Asia including the Hainan Island, the South China Sea, and the Indochina peninsula (Dao et al., 2022; Lyu et al., 2019; Wang et al., 2013). It is proposed that the basalts were extracted from different mantle domains which are separated by the convection triggered by the Pacific plate and Indo‐Australian plate (Dao et al., 2022). This is consistent with our model results that the two convection cells induced by two subducting slabs hardly interact with each other (Figure 8).…”

“…The enlarged convection meanwhile led to the inland migration of younger volcanisms (<20 Ma). The intraplate volcanisms induced by double subduction are also suggested in Southeast Asia including the Hainan Island, the South China Sea, and the Indochina peninsula (Dao et al, 2022;Lyu et al, 2019;Wang et al, 2013). It is proposed that the basalts were extracted from different mantle domains which are separated by the convection triggered by the Pacific plate and Indo-Australian plate (Dao et al, 2022).…”