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Authors: Todrani, Alessandro* 
Speranza, Fabio* 
D'Agostino, Nicola* 
Zhang, Bo* 
Title: Post-50 Ma Evolution of India-Asia Collision Zone From Paleomagnetic and GPS Data: Greater India Indentation to Eastward Tibet Flow
Journal: Geophysical Research Letters 
Series/Report no.: 1/49(2022)
Publisher: AGU-Wiley
Issue Date: 2022
DOI: 10.1029/2021GL096623
Keywords: tectonics
Subject Classification04.04. Geology 
04.03. Geodesy 
04.07. Tectonophysics 
03.01. General 
Abstract: We re-evaluate 357 Jurassic-Holocene paleomagnetic datasets from Tibet-Indochina and compare them with present-day Global Position System velocity field. SE Tibet NW of the East Himalaya Syntaxis (EHS) underwent 20°–30° counterclockwise rotations around 50 Ma, and mostly clockwise rotations after 40 Ma. NE of the EHS, post-50 Ma clockwise rotation occurred, whereas highly scattered clockwise rotations took place on northern Indochina at 25–15 Ma, after a remagnetization episode. We suggest that the indentation of Greater India NE corner at ∼50 Ma resulted in a wide orogenic reentrant characterized by opposite rotations at orocline limbs. Rotations East of EHS after 40 Ma were likely due to local strike-slip fault activity. After 30 Ma, the ongoing India collision fragmented Indochina into km-scale blocks that experienced independent rotations. The present-day clockwise rotation pattern around the EHS started at 15–10 Ma along with eastward Tibet crustal spreading, and has not produced yet a detectable paleomagnetic rotation.
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