The Structure of the Upper Mantle Transition Zone Beneath Northeast China Associated With Mantle Plume Migration. Issue 9 (30th August 2021)

• Record Type: Journal Article
• Authors: He, Chuansong
• Is Part Of: Earth and space science. Volume 8:Issue 9(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-08-30
• Subjects: upwelling mantle plume -- 410 km discontinuity -- 660 km discontinuity -- CCP stacking of receiver functions -- Songliao Basin -- NE China; Space sciences -- Periodicals; Geophysics -- Periodicals; 500.5
• DOI: 10.1029/2021EA001874
• Languages: English
• ISSNs: 2333-5084

Abstract

Abstract: The stagnation and dehydration of the Pacific Plate slab in the mantle transition zone (MTZ) are widely accepted to have resulted in Mesozoic and Cenozoic volcanic activities and the formation of the Songliao Basin in NE China. However, this notion has been challenged by recent seismic studies. Alternatively, a mantle plume may have generated the large‐scale volcanism and may have led to the formation of the Songliao Basin. In this study, a detailed analysis involving common conversion point stacking of receiver functions was carried out. The results reveal a significantly deepened region of the 410 km discontinuity and an elevated region of the 660 km discontinuity in the center of NE China (specifically, the Songliao Basin). The combination of these results with those of a previous study suggests that an upwelling mantle plume was located under the Songliao Basin in the Mesozoic. Furthermore, the distinctive structure of the MTZ beneath the southern part of the Songliao Basin identified in this study corresponds to mantle plume upwelling (a mushroom‐shaped low‐velocity anomaly), which may be related to the Changbaishan volcanic activity in the Cenozoic. Key Points: The topography of the 410 and 660 km discontinuities beneath the Songliao Basin is associated with a Mesozoic mantle plume The Mesozoic mantle plume beneath the Songliao Basin may have migrated to the southern part of the Songliao Basin The upwelling mantle plume led to the volcanism in the Changbaishan region in the Cenozoic