TY - JOUR
T1 - Upper mantle tomography of the Western Junggar
T2 - Implications for its geodynamic evolution
AU - Hua, Yuanyuan
AU - Xu, Yixian
AU - Zhao, Dapeng
AU - Huang, Rong
AU - Jiang, Xiaohuan
N1 - Funding Information:
We thank the data center of China Earthquake Administration for providing the high-quality waveform data used in this study. We appreciate helpful discussions with Drs. Zewei Wang, Ying Liu, Sheng Zhang and Bo Yang. Drs. Song Luo, Anqi Zhang, Han Xu, Shucheng Wu and others are much appreciated for their assistance and help in field observations. The free software GMT ( Wessel et al., 2013 ) and SAC ( Goldstein et al., 2003 ) are used in this study. This work was partially supported by a research grant from the National Natural Science Foundation of China ( 41530319 ) to Y. Xu and a grant ( 19H01996 ) from Japan Society for the Promotion of Science to D. Zhao. R. Huang also acknowledges support from the National Natural Science Foundation of China ( 41874055 ). We are very grateful to Prof. Vernon Cormier (the Editor) and an anonymous referee for their thoughtful review comments and suggestions that have improved this paper.
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/2
Y1 - 2020/2
N2 - A high-resolution 3-D P-wave velocity model of the upper mantle beneath the Western Junggar is determined by inverting a large number of relative travel-time residuals of teleseismic events. Our results reveal a prominent high-velocity (high-V) anomaly beneath the western Junggar basin and a low-velocity (low-V) anomaly beneath the Darbut belt. The NE-SW striking high-V anomaly at depths of 50–200 km beneath the western Junggar basin dips toward the northwest, which represents a fossil oceanic slab. The low-V anomaly may reflect an intraoceanic arc-related terrain that has experienced strong metasomatism by hot upwelling asthenosphere in the late Paleozoic, resulting in adakitic intrusions and concentration of porphyry Cu[sbnd]Au deposits in the Darbut belt. These results shed new light on the geodynamic evolution of the Western Junggar and formation mechanisms of the adakites and porphyry Cu[sbnd]Au deposits.
AB - A high-resolution 3-D P-wave velocity model of the upper mantle beneath the Western Junggar is determined by inverting a large number of relative travel-time residuals of teleseismic events. Our results reveal a prominent high-velocity (high-V) anomaly beneath the western Junggar basin and a low-velocity (low-V) anomaly beneath the Darbut belt. The NE-SW striking high-V anomaly at depths of 50–200 km beneath the western Junggar basin dips toward the northwest, which represents a fossil oceanic slab. The low-V anomaly may reflect an intraoceanic arc-related terrain that has experienced strong metasomatism by hot upwelling asthenosphere in the late Paleozoic, resulting in adakitic intrusions and concentration of porphyry Cu[sbnd]Au deposits in the Darbut belt. These results shed new light on the geodynamic evolution of the Western Junggar and formation mechanisms of the adakites and porphyry Cu[sbnd]Au deposits.
KW - Darbut belt
KW - Seismic velocity
KW - Teleseismic tomography
KW - Upper mantle
KW - Western Junggar
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U2 - 10.1016/j.pepi.2019.106405
DO - 10.1016/j.pepi.2019.106405
M3 - Article
AN - SCOPUS:85075854548
SN - 0031-9201
VL - 299
JO - Physics of the Earth and Planetary Interiors
JF - Physics of the Earth and Planetary Interiors
M1 - 106405
ER -