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Lithospheric delamination and upwelling asthenosphere in the Longmenshan area: insight from teleseismic P-wave tomography

机译:龙门山地区的岩石圈分层和上升流软流层:远震P波层析成像的见解

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摘要

We apply teleseismic P-wave tomography to reconstruct the velocity structure of the Longmenshan area. Our results show possible large-scale delamination beneath the Songpan-Ganzi and Qiangtang terranes, which induced upwelling asthenosphere. Upwelling asthenosphere might have led to lower crust heating, facilitating eastward extrusion of the Songpan Ganzi terrane resulting in localized deformation and uplift along the Longmenshan orogenic belt. We suggest that the eastward extrusion of the Songpan-Ganzi terrane against the rigid lithospheric root of the Sichuan Basin results in stress accumulation and release, leading to large earthquakes in the Longmenshan area.
机译:我们应用远震P波层析成像技术重建龙门山地区的速度结构。我们的结果表明,在松潘—甘孜和tang塘地层之下可能发生大规模分层,从而导致软流圈上升。上升流的软流层可能导致了较低的地壳加热,有利于松潘甘孜地层向东挤压,导致沿龙门山造山带的局部变形和隆升。我们认为,松潘—甘孜地层向东挤压四川盆地的刚性岩石圈根部会导致应力积累和释放,从而导致龙门山地区发生大地震。

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