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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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 -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 -韧转换带是连接深部活动韧性剪切带与地壳浅部性破裂的枢纽 ,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。
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.
引文
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