| 青藏高原西部喀喇昆仑断裂活动构造研究进展综述 |
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| 关键词:Karakorum fault western Tibetan Plateau slip-rate Late Quaternary tectonic-geomorphology active tectonics cosmogenic dating |
| 基金项目:国家自然科学基金(编号: 41272236; 41202156);中国地质调查局项目(编号: 1212011121267; 1212020918036; 12120114022901);中国地质科学院地质研究所基本科研业务费项目(编号: J1334; J1126);欧盟第六框架计划(FP6) (编号: 040070) |
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| Active Tectonics along the Karakorum Fault, Western Tibetan Plateau: A Review |
| The right-lateral strike-slip Karakorum fault (KF) system, located in western Tibetan Plateau, extends for >1 000 km from the Pamir to Western Nepal. Long-standing debates regarding the KF's initiation age, total geological offset, slip-rate at all timescales, and even where the fault's NW and SE terminus are precisely located are still ongoing. In order to understand the KF's present-day kinematic role in continental collision zones such as the Himalayan–Tibetan orogen, it is essential to determine the KF's slip-rate history and whether it varied with time and/or space. Geodetic and geologic slip-rates along the KF from present to several Ma range from ~3– 10 mm/yr. Here, after describing each of the fault's segment and explaining how to determine Late Quaternary rates, we mainly review the KF's slip-rates at different timescales (geodetic, late Quaternary and geologic) with special focus on the late Quaternary ones. We then discuss about the KF's kinematic implication, its northern end and its seismic hazard. Because of the KF's significant lifespan, length and rate, we suggest that the lithospheric deformation north of the Himalayas due to the India-Asia collision are best described by a block model, even though continuous-like deformation most likely occurs at a smaller scale within the blocks. Together with the other major strike-slip faults along the edges of the Tibetan Plateau (Altyn Tagh, Kunlun, Longmu–Gozha Co faults), the southern KF contributes to eastward extrusion of Tibet. |
| Marie-Luce CHEVALIER.2019.Active Tectonics along the Karakorum Fault, Western Tibetan Plateau: A Review[J].Acta Geoscientica Sinica,40(1):37-54. |
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