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Article Dans Une Revue Geological Society of America Bulletin Année : 2015

Late Quaternary slip-rate along the central Bangong-Chaxikang segment of the Karakorum fault, western Tibet

Résumé

Insight into the spatial and temporal changes of slip-rate is essential to understand the kinematic role of large strike-slip faults in continental collision zones. Geodetic and geologic rates from present to several million years ago along the Karakorum fault range from 0 to 11 mm/yr. Here, we determine the first late Quaternary slip-rate at the southern end of the linear Bangong-Chaxikang seg- ment of the Karakorum fault, using cumula- tive offsets (20–200 m) of fans and terraces at three sites, as well as 74 new 10Be surface- exposure ages to constrain the age of these offset geomorphic markers. The rate is >3 mm/yr at sites Gun and Chaxikang, and it is >1.7–2.2 mm/yr at the Gar fan site. Together with rates obtained along the southernmost Menshi-Kailas segment, the Karakorum fault slip-rate seems to increase southeast- ward from south of Bangong Lake to Kailas (from >3 to >8 mm/yr). These Karakorum fault slip-rate data (>3–8 mm/yr), together with the total length of the fault (>1000 km) and its initiation age (>13–23 Ma), confirm that the Karakorum fault is the major fault accommodating dextral strike-slip motion NE of the western Himalayas. The dextral Karakorum fault in the south and the con- jugate left-lateral Longmu Co–Altyn Tagh fault system in the north are thus the major strike-slip faults of western Tibet, which con- tribute to eastward extrusion of Tibet.

Domaines

Tectonique

Dates et versions

hal-01224729 , version 1 (05-11-2015)

Identifiants

Citer

Marie-Luce Chevalier, Jérôme van Der Woerd, Paul Tapponnier, Haibing Li, Frederick J. Ryerson, et al.. Late Quaternary slip-rate along the central Bangong-Chaxikang segment of the Karakorum fault, western Tibet. Geological Society of America Bulletin, 2015, pp.B31269.1. ⟨10.1130/B31269.1⟩. ⟨hal-01224729⟩
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