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Impact of Decelerating India‐Asia Convergence on the Crustal Flow Kinematics in Tibet: An Insight From Scaled Laboratory Modeling

Maiti, Giridas; Roy, Arnab; Sen, Joyjeet; Mandal, Nibir

Abstract (englisch):

The factors controlling the spatiotemporally varying deformation patterns in Tibet, a prolonged period (∼50 to 19 ± 3 Ma) of NNE-SSW shortening, accompanied by eastward flow and orogen-parallel extension in a later stage (19 ± 3 Ma to present-day), are still poorly constrained. Using viscous models, we performed scaled laboratory experiments with steady and unsteady state collision kinematics to address this issue. Our model Tibet under steady-state collision, irrespective of high (5.5 cm/yr) or low (3.5 cm/yr) indentation rates fails to produce the present-day crustal velocity fields and the deformation patterns, reported from GPS observations. An unsteady-state collision with decelerating convergence rates (5.5–3.5 cm/yr) is found to be a necessary condition for the initiation of eastward flow and ESE-WNW extensional deformations. The model results also suggest that the mechanical resistance offered by the rigid Tarim block resulted in crustal uplift at faster rates in western Tibet, setting a west to east topographic gradient, existing till present-day. This topographic gradient eventually polarized the gravity-controlled flow in the east direction when the convergence velocity decelerated to ∼3.5 cm/yr at around 19 ± 3 Ma. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000140174/pub
Veröffentlicht am 03.08.2022
Originalveröffentlichung
DOI: 10.1029/2021GC009967
Scopus
Zitationen: 1
Web of Science
Zitationen: 2
Dimensions
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1525-2027, 1525-2027
KITopen-ID: 1000140174
Erschienen in Geochemistry, geophysics, geosystems
Verlag John Wiley and Sons
Band 22
Heft 11
Vorab online veröffentlicht am 17.11.2021
Nachgewiesen in Web of Science
Scopus
Dimensions
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