TY - JOUR
T1 - Seismic Evidence for a Mantle Transition Zone Origin of the Wudalianchi and Halaha Volcanoes in Northeast China
AU - Wei, Wei
AU - Hammond, James O.S.
AU - Zhao, Dapeng
AU - Xu, Jiandong
AU - Liu, Qian
AU - Gu, Yaning
N1 - Funding Information:
We thank Prof. Qingju Wu and other members who took part in the field work for deploying the seismometers and collecting the data. The waveform data were provided by the China Seismic Array Data Management Center at Institute of Geophysics, China Earthquake Administration. The data can be accessed either from the data center (http://www.chinarraydmc.cn) or directly from the corresponding author (W. Wei) via e‐mail. This work was supported by grants from the National Natural Science Foundation of China (41604042 and 41874110) to W. Wei and a grant from MEXT (26106005) to D. Zhao. Most figures were made using the Generic Mapping Tools (Wessel et al., 2013). Prof. Maureen Long (the Editor), Prof. Brian Savage, and an anonymous referee provided thoughtful comments and suggestions that have improved this paper.
PY - 2019/1
Y1 - 2019/1
N2 - There exists much debate about origins of Cretaceous to present volcanism in northeast (NE) China. Here we present high-resolution seismic images of the upper mantle beneath NE China obtained by inverting P wave traveltime data recorded by two dense linear arrays. The inclusion of the new data set has greatly improved sampling of the upper mantle beneath the study region, providing tight constraints on the seismic structure under the intraplate Wudalianchi and Halaha volcanoes. Local-scale low P wave velocity (low-Vp) anomalies are revealed in the shallow mantle beneath the two volcanoes, whereas a large-scale high-Vp zone is imaged in the mantle transition zone. These new results suggest that the two volcanoes, though located at different sites above the stagnant Pacific slab in the mantle transition zone, are likely related to the deep subduction and dehydration of the Pacific slab, possibly through hot and wet upwelling in the big mantle wedge beneath Wudalianchi and through deeper hydrous upwelling related to slab avalanche beneath Halaha. Our results also reveal other striking features, such as high-Vp anomalies resting atop the 410-km discontinuity beneath the Great Xing'an Range and the Songliao Basin, which are attributed to detached continental lithosphere. The delamination most likely occurred in the Cretaceous, which induced widespread magmatism in NE China.
AB - There exists much debate about origins of Cretaceous to present volcanism in northeast (NE) China. Here we present high-resolution seismic images of the upper mantle beneath NE China obtained by inverting P wave traveltime data recorded by two dense linear arrays. The inclusion of the new data set has greatly improved sampling of the upper mantle beneath the study region, providing tight constraints on the seismic structure under the intraplate Wudalianchi and Halaha volcanoes. Local-scale low P wave velocity (low-Vp) anomalies are revealed in the shallow mantle beneath the two volcanoes, whereas a large-scale high-Vp zone is imaged in the mantle transition zone. These new results suggest that the two volcanoes, though located at different sites above the stagnant Pacific slab in the mantle transition zone, are likely related to the deep subduction and dehydration of the Pacific slab, possibly through hot and wet upwelling in the big mantle wedge beneath Wudalianchi and through deeper hydrous upwelling related to slab avalanche beneath Halaha. Our results also reveal other striking features, such as high-Vp anomalies resting atop the 410-km discontinuity beneath the Great Xing'an Range and the Songliao Basin, which are attributed to detached continental lithosphere. The delamination most likely occurred in the Cretaceous, which induced widespread magmatism in NE China.
KW - Halaha volcano
KW - Pacific slab
KW - Wudalianchi volcano
KW - lithospheric delamination
KW - mantle transition zone
KW - seismic tomography
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U2 - 10.1029/2018GC007663
DO - 10.1029/2018GC007663
M3 - Article
AN - SCOPUS:85060225371
VL - 20
SP - 398
EP - 416
JO - Geochemistry, Geophysics, Geosystems
JF - Geochemistry, Geophysics, Geosystems
SN - 1525-2027
IS - 1
ER -