Skip to Main content Skip to Navigation
Journal articles

Tajik Basin and Southwestern Tian Shan, Northwestern India-Asia Collision Zone: 2. Timing of Basin Inversion, Tian Shan Mountain Building, and Relation to Pamir-Plateau Advance and Deep India-Asia Indentation

Abstract : The Tajik basin and southwestern Tian Shan constitute the northwestern tip of the India-Asia collision zone. Basin inversion formed the thinskinned Tajik fold-thrust belt, outlined by westward convex fold trains, underlain by a décollement in Jurassic evaporites. The belt's leading edge-the Uzbek Gissar-and its transpressional northern lateral margin-the Tajik Gissar-constitute the thickskinned foreland buttresses. Apatite fission-track data indicate~40-to 15-Ma reheating by sediment burial in the Tian Shan. In the Gissar and the Tajik fold-thrust belt, apatite fission-track and (U,Th)/He ages date the major phase of shortening/erosion between~12 and 1 Ma, with exhumation to 2-to 3-km crustal depths within a few Myr after onset of shortening. Shortening spread immediately across the fold-thrust belt, typical for belts floored by a detachment in ductile rocks, and into the foreland buttresses. Reactivation concentrated in the internal (eastern) fold-thrust belt with the thickest evaporates. The youngest ages (~6.6-1.6 Ma) occur along the Vakhsh thrust, the active erosional front of the fold-thrust belt in the northeastern Tajik basin, where it narrows between the converging Tian Shan and Pamir. Our study links major events in the Pamir hinterland with the Tajik basin and Tian Shan foreland. In the late Eocene-early Miocene, the advancing Pamir-plateau crust loaded the foreland, inducing subsidence, reheating, and early shortening. Basin inversion and major shortening/transpression in the foreland buttresses from~12 Ma onward were synchronous with the subcrustal indentation of Indian lithosphere into the Tajik-Tarim basin lithosphere and the onset of its rollback beneath the Pamir.
Document type :
Journal articles
Complete list of metadatas

Cited literature [117 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/insu-02873590
Contributor : Jean-Paul Callot <>
Submitted on : Thursday, June 18, 2020 - 1:35:00 PM
Last modification on : Friday, October 2, 2020 - 9:48:02 PM

File

2020-Abdulhameed et al-Thermoc...
Publisher files allowed on an open archive

Identifiers

Collections

Citation

Sanaa Abdulhameed, Lothar Ratschbacher, Raymond Jonckheere, Łukasz Gągała, Eva Enkelmann, et al.. Tajik Basin and Southwestern Tian Shan, Northwestern India-Asia Collision Zone: 2. Timing of Basin Inversion, Tian Shan Mountain Building, and Relation to Pamir-Plateau Advance and Deep India-Asia Indentation. Tectonics, American Geophysical Union (AGU), 2020, 39 (5), pp.e2019TC005873. ⟨10.1029/2019TC005873⟩. ⟨insu-02873590⟩

Share

Metrics

Record views

43

Files downloads

15