| 1906年新疆玛纳斯大震区的多层次逆冲构造与深部结构 |
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| 引用本文： | 杨晓平,顾梦林,孙振国,赵成斌,周庆.1906年新疆玛纳斯大震区的多层次逆冲构造与深部结构[J].地震地质,2002,24(3):303-314. |
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| 作者姓名： | 杨晓平 顾梦林 孙振国 赵成斌 周庆 |
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| 作者单位： | 1. 中国地震局地质研究所,北京,100029
2. 中国地震局地球物理勘探中心,郑州,45002 |
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| 基金项目： | 中国地震局“九五”重点项目 (95 0 4 0 90 2 0 2 )，国家自然科学基金 (497342 0 )，新疆 30 5项目共同资助 |
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| 摘 要： | 通过对天山北麓 190 6年玛纳斯 7 7级地震区的浅层地震探测资料、石油地震反射剖面、二维电性结构剖面、深地震反射剖面的研究 ,发现玛纳斯地震区多层次活动构造系统的根带 ,它通过脆 -韧转换带与天山活动构造块体内上地壳中的低速、高导层连为一体。低速、高导层可能是天山地壳内正在活动的韧性剪切带 ,而齐古逆断裂 -褶皱带下的脆 -韧转换带是连接深部活动韧性剪切带与地壳浅部脆性破裂的枢纽 ,也是现今孕育和发生大地震的重要构造部位。 190 6年玛纳斯地震发生在脆韧转换带的底部 ,地震区的活动逆断裂和褶皱只是部分记录了深部韧性剪切带活动的信息
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| 关 键 词： | 浅层构造 深部结构 脆-韧转换带 韧性剪切带 玛纳斯地震区 |
| 文章编号： | 0253-4967(2002)03-0303-12 |
| 修稿时间： | 2001年6月8日 |
MULTILAYERED REVERSE FAULTS AND DEEP STRUCTURES IN THE MANAS EARTHQUAKE AREA, NORTHERN TIANSHAN |
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| YANG Xiao ping GU Meng lin SUN Zhen guo ZHAO Cheng bin ZHOU Qing Institute of Geology,China Seismological Bureau,Beijing ,China Research Center of Exploration Geophysics.MULTILAYERED REVERSE FAULTS AND DEEP STRUCTURES IN THE MANAS EARTHQUAKE AREA, NORTHERN TIANSHAN[J].Seismology and Geology,2002,24(3):303-314. |
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| Authors: | YANG Xiao ping GU Meng lin SUN Zhen guo ZHAO Cheng bin ZHOU Qing Institute of Geology China Seismological Bureau Beijing China Research Center of Exploration Geophysics |
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| Affiliation: | YANG Xiao ping 1) GU Meng lin 2) SUN Zhen guo 2) ZHAO Cheng bin 2) ZHOU Qing 1) 1)Institute of Geology,China Seismological Bureau,Beijing 100029,China 2) Research Center of Exploration Geophysics |
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| Abstract: | The Tianshan Mountains are a late Cenozoic rejuvenated mountain range in central Asia. The Urumqi Range front Depression is located along the northern margin of the Tianshan Mountains, consisting of a series of reverse fault and fold zones that form a typical thin skinned structural system. The southern Junggar Fault separates the Tianshan Mountains from the Urumqi Depression, in which three rows of reverse fault and fold zones are developed. From south to north, the three fault and fold zones are named Qigu reverse fault and fold zone, Manas reverse fault and fold zone and Dushanzi reverse fault and fold zone, respectively. Except for the anticlines in Qigu reverse fault and fold zone, the other anticlines in the Manas and Dushanzi reverse fault and fold zones are fault propagation fold. The shallow seismic exploration profiles show that the anticline consists of an overthrust fault zone, backward reverse fault and two partial anticlines. Four oil seismic exploration profiles show that the lower detachment fault exists in the Jurassic coal bearing strata, and the upper detachment fault exists in Paleogene strata. Some active folds are only formed on the ramps at the front of detachment fault. 2D electrical structure, deep seismic reflection profiling and crustal velocity structure across the northern Tianshan piedmont indicate that the active multilayered thrust tectonic system in the Urumqi Depression joins to a low velocity (low resistance) layer through a brittle ductile transition zone in the crust of the Tianshan. The low velocity layer in the upper crust of the Tianshan may be an active ductile shear zone. The brittle ductile transition zone under the Qigu reverse fault fold belt is the key link between the deep seated active ductile shear zone and the shallow brittle fracture, and it is also the place of strong earthquake generation. The active surface structures in Manas earthquake region recorded only a part of the information of the activities of the deep seated ductile shear zone. |
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| Keywords: | shallow structure deep structure brittle ductile transition zone ductile shear zone Manas earthquake area |
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