| Early Jurassic Soft-Sediment Deformation Interpreted as Seismites in the Wuqia Pull-Apart Basin and the Strike-Slip Talas–Ferghana Fault, Xinjiang, China |
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| 作者姓名： | QIAO Xiufu and GUO Xianpu |
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| 作者单位： | 1 State Key Laboratory of Continental Tectonics and Dynamics,Beijing 100037, China
2 Institute of Geology ,Chinese Academy of Geological Sciences, Beijing 100037, China |
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| 基金项目： | The authors are grateful to Professors Lu Hongbo and Zhang Yuxu for their constructive reviews, and to Sun Chuang for English translation. |
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| 摘 要： | The early Jurassic soft-sediment deformation occurring within lacustrine sandstone is distributed mainly in the Wuqia region of SW Tianshan Mountains, Xinjiang, western China. Triggered by earthquakes, such deformation was found to occur in three beds overlying the lower Jurassic Kangsu Formation. The main styles of deformation structures comprise load cast, ball-and-pillow, droplet, cusps, homogeneous layer, and liquefied unconformity. The deformation layers reflect a series of three strong earthquakes at the end of early Jurassic in the Wuqia region. The differences of deformation mechanisms undergone might represent the varying magnitudes of the earthquake events. During the early Jurassic, the Wuqia region was located in a pull-apart basin controlled by the significant Talas-Ferghana strike-slip fault in central Asia, which initiated the soft-sediment deformation induced by earthquakes. Our research suggests that the paleoseismic magnitudes could have ranged from Ms 6.5 to 7.
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| 关 键 词： | Early Jurassic seismicity load droplet liquefied unconformity Talas-Ferghana fault Xinjiang |
| 收稿时间： | 5/8/2012 12:00:00 AM |
| 修稿时间： | 2012/12/8 0:00:00 |
Early Jurassic Soft-Sediment Deformation Interpreted as Seismites in the Wuqia Pull-Apart Basin and the Strike-Slip Talas-Ferghana Fault, Xinjiang, China |
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| Authors: | ,
QIAO Xiufu
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GUO Xianpu |
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| Institution: | State Key Laboratory of Continental Tectonics and Dynamics, Beijing 100037, China ;Institute of Geology ,Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | The early Jurassic soft‐sediment deformation occurring within lacustrine sandstone is distributed mainly in the Wuqia region of SW Tianshan Mountains, Xinjiang, western China. Triggered by earthquakes, such deformation was found to occur in three beds overlying the lower Jurassic Kangsu Formation. The main styles of deformation structures comprise load cast, ball‐and‐pillow, droplet, cusps, homogeneous layer, and liquefied unconformity. The deformation layers reflect a series of three strong earthquakes at the end of early Jurassic in the Wuqia region. The differences of deformation mechanisms undergone might represent the varying magnitudes of the earthquake events. During the early Jurassic, the Wuqia region was located in a pull‐apart basin controlled by the significant Talas–Ferghana strike‐slip fault in central Asia, which initiated the soft‐sediment deformation induced by earthquakes. Our research suggests that the paleoseismic magnitudes could have ranged from Ms 6.5 to 7. |
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| Keywords: | Early Jurassic seismicity load droplet liquefied unconformity Talas-Ferghana fault Xinjiang |
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