大凌河隐伏断裂活动性研究  

Activity Research for the Dalinghe Hidden Fault

作　　者：万波[1] 高常波[1] 吴戈[1] 吴明大[1] 侯建军[2] 

机构地区：[1]辽宁省地震局,沈阳110031 [2]北京大学地质学系,北京100871

出　　处：《北京大学学报（自然科学版）》2000年第2期240-245,共6页Acta Scientiarum Naturalium Universitatis Pekinensis

摘　　要：以大凌河隐伏断裂为实例，根据断裂位于大凌河床底部的特点，通过对比河流（ 断裂） 两侧的第四纪地层和阶地，对隐伏断裂的活动性进行研究。孢粉分析和１４Ｃ 测年数据表明，大凌河大榆树堡—凌海市段一级阶地形成于晚更新世至全新世，二级阶地形成于晚更新世，三级阶地形成于中更新世至晚更新世早期。经测量河流两侧相对应的同级阶地面处在相同的高度上，证明自晚更新世大凌河三级阶地形成以来位于大凌河床底部的隐伏断裂没有过活动。晚更新世以来这一地区的地壳平均上升速率为０－２０ ～０－２８ ｍ ｍ／ａ。The Dalinghe hidden fault,as an example in this paper,is just located under the Dalinghe river,so the activity of this hidden fault can be defined by comparing Quaternary layers and terraces beside the river (hidden fault).Based on spore analysis of 17 layers and several 14 C chronological data,the T\-1 terrace of Dalinghe river section from Dayushupu to Linghai city is formed between Q 3 and Q 4;T\-2 formed in Q 3;T\-3 formed between Q 2 and Q 1 3.The same grade terrace height beside the river is surveyed at almost the same level,proved that the hidden fault under the river never moved after Q 3 when T 3 formed.The average crust up rate in this area from Q 3 till now is 0 20～0 28?mm/a.

关 键 词：大凌河 隐伏断裂 第四纪 阶地 活动性 

分 类 号：P542[天文地球—构造地质学]