| 中国西北帕米尔东北缘的活动断裂研究 |
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| 引用本文： | 傅碧宏,林爱明,狩野谦一,丸山正,郭建明.中国西北帕米尔东北缘的活动断裂研究[J].新疆地质,2003,21(1):1-8. |
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| 作者姓名： | 傅碧宏 林爱明 狩野谦一 丸山正 郭建明 |
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| 作者单位： | 1. 静冈大学理学部,日本,静冈,422-8529
2. 中国科学院兰州地质研究所,甘肃,兰州,730000 |
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| 基金项目： | 日本文部科学省基础科学研究项目《中国藏北及天山活动构造》资助 |
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| 摘 要： | 在卫星遥感图像的详细地质解译分析基础上，结合野外地质与地貌观察，对帕米尔东北缘山前与印度－亚欧大陆碰撞相关的活动断层进行了分析。研究结果指出，NW－NWW走向的断层主要表现为南倾逆冲断层，并伴随有强烈的右旋走滑分量。流经活动断层带的水系显示出右旋累积位错：小水系的水平位错量为4.0-20.0m，大河流的水平位错量达8－12km。沿断层带的上新世至早更新世地层也显示出一致的水平位错，位错量为8－12km。这些证明表明，帕米尔东南山前的NW－NWW走向的断层很可能开始于上新世末期至早更新世早期（2.2-3Ma)。研究结果首次厘定了帕米尔东北缘山前与向北逆冲相伴随的右旋走滑速率在第四纪期间达4.0-6.8mm/a。根据与现代地震活动相关的活断层分析，推测帕米尔东北缘山前7级以上地震重复周期为1000a左右。
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| 关 键 词： | 活动断层 右旋走滑 印度－亚欧大陆碰撞 中国 卫星遥感 |
ACTIVE FAULTING IN THE NORTHEASTERN PAMIR, NW CHINA |
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| Bi-hong Fu,Ai-ming Lin,Keni-ichi Kano,Tadashi Maruyama,Jian-ming Guo.ACTIVE FAULTING IN THE NORTHEASTERN PAMIR, NW CHINA[J].Xinjiang Geology,2003,21(1):1-8. |
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| Authors: | Bi-hong Fu Ai-ming Lin Keni-ichi Kano Tadashi Maruyama Jian-ming Guo |
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| Abstract: | Based on the detailed geologic mapping and analyses of satellite imagery combining with the field geologic and geomorphic observations, active faults due to India-Eurasia collision have been documented in the northeastern front of the Pamir. Our analyses indicate that NW-NWW striking faults are mainly expressed by the south-dipping thrusting with extensive right-lateral strike-slip component. Drainage systems across the active faults show the cumulative right-lateral displacement and horizontal offset varying from 4.0 m to 20.4 m for small streams. The displaced largest stream and Tertiary to lower Pleistocene sequences show identical horizontal displacement of 8-12 km along the fault zone. Our results firstly constrain that northward overthrusting accommodates a right-lateral partitioning with a long-term slip rate of 4.0-6.8 mm/yr in the northeastern front of the Pamir during Quaternary. From the analysis of active faults associated with current seismic events, we inferred that recurrence interval of large seismic events (Ms >7) is ca. 1 kyr. |
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| Keywords: | Active fault strike-slip partitioning northeastern Pamir India-Eurasia collision |
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