Weak and vanishing upper mantle discontinuities generated by large-scale lithospheric delamination in the Longmenshan area, China
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Abstract A large amount of high-quality teleseismic data is used for common conversion point (CCP) stacking of receiver functions in the Longmenshan area. The results show that a large-scale high-velocity anomaly or lithospheric delamination can completely destroy upper mantle discontinuities or erase the phase boundary of olivine, which is a very important finding and can be used to assess stagnant slabs in the mantle transition zone globally. The deepening region of the 660 km discontinuity beneath the Songpan-Ganzi terrane might indicate that the large-scale high-velocity anomaly in the mantle transition zone is a cold domain and can affect the topography of upper mantle discontinuities.
2021 ◽
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1996 ◽
Vol 124
(2)
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pp. 637-641
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1998 ◽
Vol 133
(1)
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pp. 31-43
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1994 ◽
Vol 117
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pp. 427-440
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1996 ◽
Vol 124
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pp. 642-646
2014 ◽
Vol 199
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pp. 996-1005
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1996 ◽
Vol 101
(B4)
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pp. 8393-8402
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