Subduction‐Induced Asthenospheric Flow Around the Songliao Basin in NE China Revealed by Shear Wave Splitting Measurements of Dense Seismic Arrays

Abstract

When applied to plate boundaries such as midocean ridges and subduction zones, plate tectonics theory has satisfactorily explained the genesis of volcanism (Morgan, 1968). However, this hypothesis does not provide a satisfactory explanation for intraplate volcanism, which occurs far from plate boundaries (Lee & Grand, 2012). Intraplate volcanism is conventionally attributed to deep-rooted mantle plumes that originate at the core-mantle boundary (Morgan, 1971), such as the Hawaii volcanic chain, whereas the mantle plume model does not work for some intraplate volcanism. For instance, Cenozoic basaltic volcanism was widespread in Northeast China. The isotopic data indicate that the Northeast China volcanism was not caused by a high-3 He/ 4 He mantle plume (Chen et al., 2007). Moreover, the lower mantle does not exhibit slow seismic velocity anomaly at any depth

Fine Crust‐Mantle Structure of the Major Tectonic Boundaries Between the North China Craton and Central Asian Orogenic Belt Revealed From Rayleigh Wave Phase Velocities and Receiver Functions

“…Xu et al. (2023) detected anisotropy beneath the Songliao Basin, displaying a circular distribution in the fast direction. They linked this observation to a persistent high‐velocity anomaly in the upper mantle, indicating early lithospheric subsidence.…”

“…obtained inversion results showing fast Vs at depths of approximately 40-100 km and suggested that the dense mantle lid beneath the Songliao Basin might hinder the migration of asthenospheric melt to the surface Xu et al (2023). detected anisotropy beneath the Songliao Basin, displaying a circular distribution in the fast direction.…”

Fault-scale crustal structure across the Dunhua-Mishan fault (Tanlu northern segment) constrained from teleseismic P-wave receiver functions

“…Previous studies investigated the crustal and upper mantle structures to better understand the lithosphere formation and modification across the northern segment of the Tanlu fault zone. The seismic azimuth anisotropy showed that the fast directions within the northern segment of the Tanlu fault zone were systematically shifted to NW-SE, which may reflect the extension of the lithosphere since the late Mesozoic [20][21][22][23] . A deep seismic reflection profile in the northern region of the Dunhua-Mishan fault within the Jiamusi-Mudanjiang block revealed that the Dunhua-Mishan Fault penetrate the crust into the upper mantle 24 .…”