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Tajik Depression and Greater Pamir Neotectonics from InSAR Rate Maps

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Metzger,  Sabrina
4.1 Lithosphere Dynamics, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Gągała,  Łukasz
External Organizations;

Ratschbacher,  Lothar
External Organizations;

Lazecký,  Milan
External Organizations;

Maghsoudi,  Yasser
External Organizations;

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Schurr,  B.
4.1 Lithosphere Dynamics, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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5008871.pdf
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Zitation

Metzger, S., Gągała, Ł., Ratschbacher, L., Lazecký, M., Maghsoudi, Y., Schurr, B. (2021): Tajik Depression and Greater Pamir Neotectonics from InSAR Rate Maps. - Journal of Geophysical Research: Solid Earth, 126, 12, e2021JB022775.
https://doi.org/10.1029/2021JB022775


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5008871
Zusammenfassung
Using E-W and vertical deformation-rate maps derived from radar interferometric time-series, we analyze the deformation field of an entire orogenic segment, i.e., the Tajik depression and its adjoining mountain belts, Tian Shan, Pamir, and Hindu Kush. The data-base consists of 900+ radar scenes acquired over 2.0–4.5 years and global navigation satellite system measurements. The recent, supra-regional kinematics is visualized in an unprecedented spatio-temporal resolution. We confirm the westward collapse of the Pamir-Plateau crust, inverting the Tajik basin into a fold-thrust belt with shortening rates decaying westward from ∼15 to 2 mm/yr. Vertical rates in the Hindu Kush likely record slab-dynamic effects, i.e., the progressive break-off of the Hindu Kush slab. At least 10 mm/yr of each, uplift and westward motion occur along the western edge of the Pamir Plateau, outlining the crustal-scale ramp along which the Pamir Plateau overrides the Tajik depression. The latter shows a combination of basin-scale tectonics, halokinesis, and seasonal/weather-driven near-surface effects. Abrupt ∼6 mm/yr horizontal-rate changes occur across the kinematically-linked dextral Ilyak strike-slip fault, bounding the Tajik fold-thrust belt to the north, and the Babatag backthrust, the major thrust of the fold-thrust belt, located far west in the belt. The sharp rate decay across the Ilyak fault indicates a locking depth of ≤1 km. The Hoja Mumin salt fountain is spreading laterally at ≤350 mm/yr. On the first-order, the modern 20–5 and fossil (since ∼12 Ma) 12–8 mm/yr shortening rates across the fold-thrust belt correspond.