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Intraplate Volcanism in Northeast China Controlled by the Underlying Heterogeneous Lithospheric Structures

Description: 

The origin and mantle dynamics of the Quaternary intraplate sodic and potassic volcanism in northeast China have long been intensely debated. Here we present a high-resolution three-dimensional crust and upper mantle S-wave velocity model of northeast China by combining ambient noise and earthquake two-plane wave tomography based on unprecedented regional dense seismic arrays. Our seismic images highlight a strong correlation between the basalt geochemistry and upper mantle seismic velocity structure: sodic volcanoes are all characterized by prominent low seismic velocities in the uppermost mantle, while potassic volcanoes still possess a normal but thin upper mantle "lid" depicted by high seismic velocities. Linking our tomographic images with previous petrological and geochemical study results, we propose that the heterogeneous lithospheric structures beneath northeast China control the style of mantle dynamics in producing the Quaternary sodic and potassic intraplate volcanism. The very young Wudalianchi and Nuominhe potassic volcanism is likely caused by the interaction between the asthenospheric low-degree melts and the overlying subcontinental lithospheric mantle, whereas the more widespread Quaternary sodic volcanism is directly sourced from the upwelling asthenosphere as a result of localized lithospheric thinning and destruction.

Session: Earth’s Structure from the Crust to the Core - II

Type: Oral

Date: 5/1/2024

Presentation Time: 10:30 AM (local time)

Presenting Author: Qi-Fu

Student Presenter: No

Invited Presentation: 

Authors