Multiple source downwellings beneath eastern North China revealed by 3-D CCP migration of receiver function data

S‐Velocity Mantle Structure of East Asia From Teleseismic Traveltime Tomography: Inferred Mechanisms for the Cenozoic Intraplate Volcanoes

“…Zuo et al. (2020) suggested that lithospheric delamination results in a returning upwelling that is feeding the Datong volcanic field, but this may not be adequate to explain the deep origin of the low‐velocity anomaly. Therefore, slab‐induced circulation or dehydration of the hydrous MTZ perturbed by the subducting slab may be possible mechanisms to generate upwellings from the edge of the stagnant Pacific slab in the MTZ, thus causing intraplate volcanoes such as the Datong volcanic field.…”

“…Wang and Li (2018) proposed hot mantle upwelling triggered by lithospheric delamination beneath the Songliao basin by using thermal conductivity models constrained by surface heat flow and Curie depths from geomagnetic anomaly models. The delaminated lithosphere is imaged to be descending to the MTZ, which may be responsible for the thick MTZ beneath the northern path of the Datong volcanic field as estimated by a receiver function study (Zuo et al., 2020). However, our model does have some vertical smearing (Figure 12) and therefore the depth extent of the delaminated lithosphere is not certain.…”

“…On the other hand, Wei and Zhao (2020) proposed that an avalanche of the stagnant Pacific slab from the MTZ into the lower mantle may have caused the mantle upwelling beneath the Datong volcanic field, but in this case the low-velocity anomaly should have extended to the bottom of the MTZ, which is not observed in our model. Zuo et al (2020) suggested that lithospheric delamination results in a returning upwelling that is feeding the Datong volcanic field, but this may not be adequate to explain the deep origin of the low-velocity anomaly. Therefore, slab-induced circulation or dehydration of the hydrous MTZ perturbed by the subducting slab may be possible mechanisms to generate upwellings from the edge of the stagnant Pacific slab in the MTZ, thus causing intraplate volcanoes such as the Datong volcanic field.…”

Seismic Tomography of the Trans-North China Orogen and Its Dynamic Implications

“…Besides, the temperature and water content were believed to be the primary causes for the thickness variation of the mantle transition zone (Litasov et al, 2005). Following the equations proposed by Suetsugu et al (2010), the temperature and water content in the mantle transition zone, approximately −18.4 K and 0.3 wt%, respectively, were calculated using the average S wave velocity of this study and the thickness of the mantle transition zone estimated by Zuo et al (2020) under the Datong volcano. Considering the deeper 410-km discontinuity of about 422.0 km corresponding to the higher temperature (Zuo et al, 2020), our estimated temperature of −18.4 K may indicate the relative cold lower mantle transition zone, whereas the water content of 0.3 wt% leads to the water-rich mantle transition zone.…”

“…Following the equations proposed by Suetsugu et al (2010), the temperature and water content in the mantle transition zone, approximately −18.4 K and 0.3 wt%, respectively, were calculated using the average S wave velocity of this study and the thickness of the mantle transition zone estimated by Zuo et al (2020) under the Datong volcano. Considering the deeper 410-km discontinuity of about 422.0 km corresponding to the higher temperature (Zuo et al, 2020), our estimated temperature of −18.4 K may indicate the relative cold lower mantle transition zone, whereas the water content of 0.3 wt% leads to the water-rich mantle transition zone. This water-rich mantle transition zone beneath the Datong volcano maybe help to materialize the partial melting and the origin of the asthenospheric upwelling.…”