新疆北天山江南庙断层陡坎及其形成机制
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摘要
在北天山中段第一排构造外围的宁家河—三个泉河之间 ,有一由北倾断裂形成的反向陡坎。该陡坎应为断裂多次错动的结果。陡坎形成初期 ,坎南为断塞塘 ,沉积物年龄为 5 0 0 0 a。在宁家河剖面可见河谷阶地砾石向上游倾斜 ; 级阶地错动 3～ 4m。依断裂模式归类 ,江南庙断裂为后逆冲断裂。这类断裂是否能发生 7级以上地震 ,断裂坎是否是古地震造成 ,尚不能确定。
In the periphery of the first row of structure in the middle section of North Tianshan, there is a reverse scarp that was formed by a thrust dipping roward north. It is considered to be a result of many times of dislocations of the fault.In the early period when the scarp formed a sreies of fault barrier ponds shaped to the south of the scarp, There the age of the deposit is 5 000 a. It can be seen form Ningjiahe profile that the gravel in Valley terrace inclines to the upstream and the second-order terrace has a dislocation of 3～4m.Classfied by fault modes, jiangnanmiao fault is a back-thrust fault. At present,it isn't clear whether Ms≥7.0 earthquakes could by produced by this kind of faults and whether the scarp was formd by paleoeartquakes.
In the periphery of the first row of structure in the middle section of North Tianshan, there is a reverse scarp that was formed by a thrust dipping roward north. It is considered to be a result of many times of dislocations of the fault.In the early period when the scarp formed a sreies of fault barrier ponds shaped to the south of the scarp, There the age of the deposit is 5 000 a. It can be seen form Ningjiahe profile that the gravel in Valley terrace inclines to the upstream and the second-order terrace has a dislocation of 3～4m.Classfied by fault modes, jiangnanmiao fault is a back-thrust fault. At present,it isn't clear whether Ms≥7.0 earthquakes could by produced by this kind of faults and whether the scarp was formd by paleoeartquakes.
引文
1新疆维吾尔自治区地震局。新疆石场幅地质说明书 ,1978.
1 柏美祥 ,新疆乌苏—呼图壁县一带活断层及古地震 [J].内陆地震 ,1990 ,4(1) :2 1～ 2 5
2 邓起东 ,冯先岳 ,尢惠川等 ,新疆独山子—安集海活动逆断裂—褶皱带的变形特征及其形成机制 [J],活动断裂研究 (1)[M].北京 :地震出版社 ,1991.17～ 36
3 冯先岳 .新疆古地震 [M].乌鲁木齐 :新疆科技卫生出版社 ,1997
1 柏美祥 ,新疆乌苏—呼图壁县一带活断层及古地震 [J].内陆地震 ,1990 ,4(1) :2 1～ 2 5
2 邓起东 ,冯先岳 ,尢惠川等 ,新疆独山子—安集海活动逆断裂—褶皱带的变形特征及其形成机制 [J],活动断裂研究 (1)[M].北京 :地震出版社 ,1991.17～ 36
3 冯先岳 .新疆古地震 [M].乌鲁木齐 :新疆科技卫生出版社 ,1997
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