马鹿池断裂与官渡口断裂的成因关联分析  

ANALYSIS ON GENESIS OF MALUCHI FAULT WITH GUANDUKOU FAULT AT THREE GORGES

作　　者：李细光[1] 姚运生[2] 秦小军[2] 

机构地区：[1]中国地质大学地球科学学院,武汉430074 [2]中国地震局地震研究所,武汉430071

出　　处：《大地测量与地球动力学》2004年第2期42-47,共6页Journal of Geodesy and Geodynamics

基　　金：科技部 2 0 0 2年公益研究专项(国科发财字 [2 0 0 2 ] 484号 );长江三峡工程开发总公司 2 0 0 3年专项资助项目 (CT -0 3 -0 7-0 2 )"长江三峡水库诱发地震监测研究"

摘　　要：通过对三峡巴东马鹿池断裂与官渡口断裂的成因关联对比分析 ,发现二者在几何学、运动学、内部结构以及年代学等方面存在很大差异。平面上 ,二者没有相连 ;规模上 ,马鹿池断裂晚期比早期大 ,发育“花状”构造 ,官渡口断裂晚期比早期小 ,其滑脱面位于早期断裂带中 ,大地电磁测深资料显示二者在深部没有联系 ;运动方式上 ,马鹿池断裂晚期为左行走滑 ,官渡口断裂晚期自南向北发生滑脱 ;内部分带现象上 ,马鹿池断裂主要存在于晚期 ,而官渡口断裂主要存在于早期 ;从断层泥特征上看 ,马鹿池断裂运动方式以蠕滑为主 ,官渡口断裂则以粘滑运动为主 ;地貌上 ,马鹿池断裂两侧地形相差不大 ,官渡口断裂两侧地形相差较大 ,南高北低 ,遍布溶洞 ;SEM、TL测年上 ,马鹿池断裂比官渡口断裂更新 ,活动距今更近。据此认为马鹿池断裂与官渡口断裂二者在成因上没有联系 。Analyzing the genesis of the Maluchi fault and the Guandukou fault from at the Three Gorges, we find out that great differences exist in the above two faults, such as fault geometry, kinematics, inner configuration and chronology, etc. On the earth's surface, they are not joined, and the Maluchi fault with 'flower structure' in later period is bigger on scale than in early stage, and the Guandukou fault is the reverse, the data of magnetotelluric sounding also demonstrates that they have no connection in depth. On their patterns of movement in later period, the Maluchi fault shows left-lateral strike-slip, however the Guandukou shows a dip-slip fault from south to north. The phenomena of dividing belts in their inner of the Maluchi fault existed basically in the later period and in the early stage for the Guandukou fault, and as regards the characteristics of their fault gouges, the way of movement is mostly creeping slip in the Maluchi fault and stick-slip in the Guandukou fault. On landform, there is faw difference in the topography on the two sides of the Maluchi fault, however, the topography of on the south side Guandukou fault is higher than that of the north side.The Scanning Electron Microscopy (SEM) and TL dating indicate that the Maluchi fault (TL:207.63±17.65ka) is later than the Guandukou fault (TL:427.88±36.37ka).In the light of above analyses, we have drawn the conclusion that there is no connection between the Maluchi fault and the Guandukou fault in the genesis, and they are not linked up in depth.

关 键 词：马鹿池断裂 官渡口断裂 SEM测年 TL测年 三峡地区 成因 关联分析 

分 类 号：P542.3[天文地球—构造地质学]