<abstract xmlns="http://www.w3.org/1999/xhtml"><p>The Gyaring Co Fault (GCF) is an active right-lateral strike-slip fault in central Tibet that accommodates convergence between India and Asia in the interior of the Tibetan Plateau. The average long-term slip rate of the fault remains controversial, given the absence of absolute age data of faulted geomorphic features. We have applied optically stimulated luminescence (OSL) dating to the northern segment of the GCF, revealing that the GCF has displaced alluvial fans at Aerqingsang by 500 ± 100 m since their deposition at ~109 ka, yielding a slip rate of 4.6 ± 1.0 mm/yr. A slip rate of 3.4 ± 0.4 mm/yr is inferred from analysis of an alluvial fan with an offset of 65 ± 5 m (~19 ka) at Quba site 1. The Holocene slip rate is estimated to be 1.9 ± 0.3 mm/yr, as inferred from the basal age (~8.3 ka) of terrace T1 that has a gully displacement of 16 ± 2 m at Quba site 2. These slip rates are generally lower early estimates (10–20 mm/yr), but are consistent with more recent results (2.2–4.5 mm/yr) and GPS data for other strike-slip faults in this region, indicating that deformation may be distributed across the entire Tibetan Plateau. Moreover, we suggest that the slip rate along the GCF may have decreased slightly during the late Quaternary.</p></abstract>

The Gyaring Co Fault (GCF) is an active right-lateral strike-slip fault in central Tibet that accommodates convergence between India and Asia in the interior of the Tibetan Plateau. The average long-term slip rate of the fault remains controversial, given the absence of absolute age data of faulted geomorphic features. We have applied optically stimulated luminescence (OSL) dating to the northern segment of the GCF, revealing that the GCF has displaced alluvial fans at Aerqingsang by 500 ± 100 m since their deposition at ~109 ka, yielding a slip rate of 4.6 ± 1.0 mm/yr. A slip rate of 3.4 ± 0.4 mm/yr is inferred from analysis of an alluvial fan with an offset of 65 ± 5 m (~19 ka) at Quba site 1. The Holocene slip rate is estimated to be 1.9 ± 0.3 mm/yr, as inferred from the basal age (~8.3 ka) of terrace T1 that has a gully displacement of 16 ± 2 m at Quba site 2. These slip rates are generally lower early estimates (10–20 mm/yr), but are consistent with more recent results (2.2–4.5 mm/yr) and GPS data for other strike-slip faults in this region, indicating that deformation may be distributed across the entire Tibetan Plateau. Moreover, we suggest that the slip rate along the GCF may have decreased slightly during the late Quaternary.

OSL dating of the late Quaternary slip rate on the Gyaring co Fault in central Tibet

State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029,

Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075,

The School of Earth Science and Resources, Chang’an University, Xi’an, 710064,

Geochronometria

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The Gyaring Co Fault (GCF) is an active right-lateral strike-slip fault in central Tibet that accommodates convergence between India and Asia in the interior...

OSL dating of the late Quaternary slip rate on the Gyaring co Fault in central Tibet

Publié en ligne: 30 janv. 2016

Pages: 162 - 173

Reçu: 31 janv. 2016

Accepté: 14 sept. 2016

DOI: https://doi.org/10.1515/geochr-2015-0040

Mots clés
slip rate, OSL dating, Gyaring Co Fault, late Quaternary, central Tibet

© 2016 D. Wang

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

OSL dating of the late Quaternary slip rate on the Gyaring co Fault in central Tibet

Publié en ligne: 30 janv. 2016

Pages: 162 - 173

Reçu: 31 janv. 2016

Accepté: 14 sept. 2016

DOI: https://doi.org/10.1515/geochr-2015-0040

Mots clésslip rate, OSL dating, Gyaring Co Fault, late Quaternary, central Tibet

© 2016 D. Wang

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
slip rate, OSL dating, Gyaring Co Fault, late Quaternary, central Tibet