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地球学报  2006 

新民堡断裂新构造活动特征

DOI: 10.3975/cagsb.2006.06.01

Keywords: 逆冲推覆,蠕滑,新民堡断裂,甘肃

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Abstract:

新民堡断裂属于河西走廊西段酒西盆地内断裂系的组成部分,位于嘉峪关以西40km的新民堡一带。新民堡断裂呈北西西向延伸,长8.0km,走向299°,倾向南西,倾角20°~35°。断裂下部主要发育在新近系红色泥岩中,地表穿切上更新统和全新统,变形性质以蠕滑变形为主,活动方式属于逆冲推覆;新民堡断裂在距今69.3ka与35.4ka之间、距今28.3ka左右,距今4.4ka左右发生过新构造活动。断裂位移速率为0.54~0.90mm/a,其中垂直位移速率为0.26~0.50mm/a。同时,以新民堡断裂为代表的低角度逆冲推覆断裂是造成酒西盆地及河西走廊横向压缩的重要因素和表现形式之一。

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