长江三峡狮子口地区断层最新活动年龄及工程评价

地震地质 ›› 1991, Vol. 13 ›› Issue (1): 78-86.

长江三峡狮子口地区断层最新活动年龄及工程评价

李兴唐¹, 袁登维², 周继颐²

1. 中国科学院地质研究所, 北京 100029;
2. 水利部长江水利委员会勘测总队, 武汉 430010

收稿日期:1990-01-31 出版日期:1991-03-06 发布日期:2009-11-25

DATING AND ENGINEERING EVALUATION OF RECENT FAULT ACTIVITY IN SHIZHIKOU AREA OF THE THREE GORGES SECTION OF CHANGJIANG RIVER

Li Xing-tang¹, Yuan Deng-wei², Zhou Ji-yi²

1. Institute of Geology, Academia Sinica, Beijing 100020;
2. General Geological Survey Brigade, Commision on water Conservancy of Changjiang River, Wuhan 430010

Received:1990-01-31 Online:1991-03-06 Published:2009-11-25

摘要/Abstract

摘要： 经野外调查和验证,长江三峡狮子口地区的NNW向遥感线性形迹是地形、岩性和小型断层的反映。对区内断层带样品进行的同位素年龄测定,判定出青林口断层在距今49×10⁴a曾有轻微活动,其余的四条断层第四纪(240×10⁴a)以来无活动。地貌、地质和微震(M<3)分布表明,这些断层现代是不活动的,非控震构造,对三峡水库、大坝工程稳定性无影响。

关键词: 长江三峡, 狮子口地区, 断层最新活动, 工程活动断裂

Abstract: The NNW-trending linear traces in the Shizhikou area of the Three Gorges section of Changjiang River reflect the relief,lithologic features and small-scale faults. It is inferred from geologic and geomorphic data and result of isotopic dating that the Qinglin-kou fault was slightly activated in 49?10⁴a B. P. The Jufang fault was not activated since 50?10⁴a,and other three small faults were not been also activated since 50?104a,even in the Quaternary period. The geologic and geomorphic data and distribution of earthquake epicenters indicate that the NNW-trending faults in the studied area have not been active in recent time,and not the seismogenic and earthquake-generating faults either which would not have an influnce on the stability of the Three Gorge reservoir and its dam.

Key words: Three Gorges on Changjiang River, Sizhikou area, Recent fault activity, Enginering-active fault

李兴唐, 袁登维, 周继颐. 长江三峡狮子口地区断层最新活动年龄及工程评价[J]. 地震地质, 1991, 13(1): 78-86.

Li Xing-tang, Yuan Deng-wei, Zhou Ji-yi. DATING AND ENGINEERING EVALUATION OF RECENT FAULT ACTIVITY IN SHIZHIKOU AREA OF THE THREE GORGES SECTION OF CHANGJIANG RIVER[J]. SEISMOLOGY AND GEOLOGY, 1991, 13(1): 78-86.

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