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Seismic Evidence for Lateral Asthenospheric Flow Beneath the Northeastern Tibetan Plateau Derived From S Receiver Functions

Urheber*innen

Xu,  Qiang
External Organizations;

Pei,  Shunping
External Organizations;

/persons/resource/yuan

Yuan,  X.
2.4 Seismology, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Zhao,  Junmeng
External Organizations;

Liu,  Hongbing
External Organizations;

Tu,  Hongwei
External Organizations;

Chen,  Shuze
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4185900.pdf
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Zitation

Xu, Q., Pei, S., Yuan, X., Zhao, J., Liu, H., Tu, H., Chen, S. (2019): Seismic Evidence for Lateral Asthenospheric Flow Beneath the Northeastern Tibetan Plateau Derived From S Receiver Functions. - Geochemistry Geophysics Geosystems (G3), 20, 2, 883-894.
https://doi.org/10.1029/2018GC007986


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_4185900
Zusammenfassung
We present detailed lithospheric images of the NE Tibetan Plateau by applying the depthmigration technique toSreceiver functions derived from 113 broadband stations. Our migrated imagesindicate that the lithosphere‐asthenosphere boundary (LAB) lies at depths of 105–120 km beneath the Qilianterrane and reaches depths of 126–140 km below the Alxa and Ordos blocks. The most prominent variationin the LAB depth is the presence of LAB steps of no less than 20 km in the transition zone between theactive NE Tibetan Plateau and the surrounding cratonic Alxa and Ordos blocks, which conflicts with themodel of southward subduction of the Alxa and Ordos blocks. Furthermore, the marked LAB steps occur at130 ± 10 km away from the southern surficial boundary faults between the NE Tibetan Plateau and thesurrounding tectonic provinces, corresponding to the North Qilian fault and the Liupanshan fault,respectively. Therefore, we propose that these scenarios of LAB can be attributed to the delamination offragmented mantle lithosphere in the transition zone between the NE Tibetan Plateau and the surroundingAlxa and Ordos blocks, triggered by lateral asthenosphericflow. In addition, our observations of a thinlithosphere with thickness of 107–115 km beneath the Songpan‐Ganzi terrane and the west Qinlin orogengreatly facilitate the process of underlying lateral asthenosphericflow. The isostatic uplift of the plateaucaused by the delamination of fragmented mantle lithosphere, together with increased horizontalcompressive stress, may have led to the outward growth of the NE Tibetan Plateau.