A fluvial record of fault-propagation folding along the northern Qilian Shan front, NE Tibetan Plateau
A fluvial record of fault-propagation folding along the northern Qilian Shan front, NE Tibetan Plateau
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青藏高原东北部祁连山前缘断层传播褶皱的河流记录
DOI：
10.1016/j.tecto.2019.02.009
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发表时间：
2019-03
期刊：
影响因子：
2.9
通讯作者：
Liu Xiaopeng
中科院分区：
文献类型：
--
作者：
Cao Xilin;Hu Xiaofei;Pan Baotian;Zhang Jian;Wang Wei;Mao Junwei;Liu Xiaopeng
逆冲断层的运动学是认识山脉变形和隆升的关键。通过发光and10Be接触约会,放弃年龄阶地面被确定为100.9 ±5.8 ka BP T9, 88.7±7.0 ka BP T8,和68.8 ±7.6 ka BP的T7。利用差分GPS在单斜上测得的台地剖面来约束近期的褶皱变形，利用三剪模型来估计断层滑动速率和逆冲历史。由此得出，自~90 ka BP以来，黑河口（HHK）断层的平均滑动速率为1.3 ± 0.1 mm/a。此外，我们的研究结果表明，HHK断裂发生在0.8 ~ 1.4 Ma，表明北祁连山断裂（NQF）的活动逆冲断裂最近向东北扩展。北祁连山沿西、中、东三段均有均匀分布的滑动。由于沿NQF的推力运动不同，抬升速率沿推力上壁面分布不均匀。
The kinematics of thrust fault is key to understand the deformation and uplift of mountain ranges. Along the northern front of the central Qilian Shan mountain range, the NE Tibet Plateau, a flight of terraces developed along the Red Sand River were deformed above a growing fault-propagation fold. Via luminescence and10Be exposure dating, abandonment ages of the terrace surfaces were determined to be 100.9 ± 5.8 ka BP for T9, 88.7 ± 7.0 ka BP for T8, and 68.8 ± 7.6 ka BP for T7. Terrace profiles measured by differential GPS across the monocline were used to constrain the recent fold deformation, and the trishear model was applied to estimate the fault slip rate and thrust history. We thus derived an average slip rate of 1.3 ± 0.1 mm/a for the Heihekou (HHK) fault since ~90 ka BP. In addition, our results imply that the onset of the HHK fault occurred at 0.8–1.4 Ma, indicating a recent northeastward propagation of the active thrust faulting of the North Qilian Shan Fault (NQF). Our results also indicate uniformly distributed slip along the western, central, and eastern segments of the north Qilian Shan. Due to the different thrust kinematics along the NQF, the uplift rate is not uniformly distributed along the hanging wall of the thrust.
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