Miocene Jiali faulting and its implications for Tibetan tectonic evolution
Resource
Earth and Planetary Science Letters 205 (3-4): 185-194
Journal
Earth and Planetary Science Letters
Journal Volume
205
Journal Issue
3-4
Pages
185-194
Date Issued
2003
Author(s)
Lee, Hao-Yang
Wang, Jun-Ren
Wen, Da-Jen
Yang, Tsanyao F.
Zhang, Yuquan
Xie, Yingwen
Lee, Tung-Yi
Wu, Genyao
Ji, Jianqing
Abstract
The Karakoram-Jiali Fault Zone (KJFZ) comprises a series of right-lateral shear zones that southerly bound the eastward extrusion of northern Tibet relative to India and stable Eurasia. Here we present new 40Ar/39Ar age data from the Pqu and Parlung faults, two easternmost branches of the Jiali fault zone, which indicate a main phase of the KJFZ shearing from ∼ 18 to 12 Ma. Thus, the Tibetan eastward extrusion bounded by principal strike-slip fault zones started and was probably most active around the middle Miocene, an interval marked also by active east-west extension in southern Tibet. The coincidence of these two tectonic events strongly suggests a common causal mechanism, which is best explained as oblique convergence between India and Asia. Under the framework of this mechanism, the extension in southern Tibet is not a proxy for the plateau uplift. The KJFZ activity was furthermore coincident with right-lateral displacements along the Gaoligong and Sagaing faults in southeast Asia. This defines a Miocene deformation record for the regional dextral accommodation zone that, in response to the continuing India-Asia collision, may have accounted for the initiation and prolonged history of clockwise rotation of the Tibetan extrusion around the eastern Himalayan Syntaxis. © 2002 Elsevier Science B.V. All rights reserved.
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