Segmented Moho Uplift and Implications for Magmatic Underplating Beneath the Datong Basin

Abstract

Understanding how the deep crust responds to coupled tectonic and magmatic processes is essential for deciphering intracontinental rifting. We apply high‐resolution passive‐source reverse time migration to teleseismic P‐wave receiver functions recorded by a dense seismic array to image the Moho beneath the Datong Basin. Our observations reveal a segmented Moho interface with localized crustal thinning (to 38–39 km), relative to a regional average of ∼40.5 km. Statistical analyses show that intraplate seismicity clusters where the lateral gradient of Moho depth is steep ( ≥ ${\ge} $ 0.15, a dip of ∼8.5 ° ${}^{\circ}$ ) along the southwestern basin‐bounding normal faults, indicating mechanical coupling between upper‐crustal faulting and localized lower‐crustal deformation. Moho conversion amplitudes are enhanced in the northeastern volcanic area, which are associated with overlying lower‐crustal low‐ Vs ${V}_{s}$ anomalies in connection with magmatic underplating. Horizontal extension accommodated by high‐angle normal faulting and magmatic modification therefore dominate the Moho evolution in different segments of the rift.