博格达北麓晚第四纪地壳缩短速率  

CRUSTAL SHORTENING RATE OF NORTHERN BOGEDA MOUNTAIN IN LATE QUATERNARY

作　　者：吴国栋[1] 吴传勇[1] 沈军[2] 戴训也 陈建波[1] 

机构地区：[1]新疆维吾尔自治区地震局,新疆乌鲁木齐830011 [2]防灾科技学院,河北三河065201

出　　处：《内陆地震》2016年第2期116-121,共6页Inland Earthquake

基　　金：财政部重大专项"我国地震重点监视防御区活动断层地震危险性评价";新疆地震科学基金项目(201409)共同资助

摘　　要：博格达推覆构造,由南向北发育3~4排活动断裂,活动性逐渐向北迁移,最新活动主要集中在前缘的阜康断裂及北三台断裂上。阜康断裂上盘在二工河一带为单斜岩层,具有断弯褶皱的特征,通过测量阶地拔河高度、阶地基座岩层的产状以及阶地年代数据,应用断弯褶皱变形的关系式得到了断层沿断层面滑动速率为0.8 mm/a;北三台断裂发育在断层扩展褶皱北三台背斜北翼,利用阶地剩余面积及褶皱滑脱面埋深,计算得到北三台背斜晚更新世晚期以来的缩短速率在0.5~0.9mm/a之间。综合得到博格达北麓晚第四纪地壳缩短速率为1.3~1.7 mm/a,考虑到埋藏地貌面的变形量,估计博格达北麓晚第四纪以来南北向总的地壳缩短速率在1.5~2.0 mm/a之间。In the Bogeda nappe tectonics,there are three or four active faults and their activity migrates gradually from south to north.The latest movement mainly displays in the Fukang fault and Beisantai fault.In Ergong river area,the upper wall of Fukang fault is monoclines strata,being characteristic of fault-bend fold.By measuring the terrace＇s height,the stratum attitude of terrace＇s base and the age data,writers obtain the fault＇s slip rate which is 0.8 mm / a,applying the relationship of fault-bend fold deformation; Beisantai fault grows in the north limb of Beisantai fault-propagation fold.With the terrace remaining area and the buried depth of detachment,the calculating result of the shortening rate of Beisantai fold since late Pleistocene is 0.5 ~ 0.9 mm / a.The total crustal shortening rate of northern Bogeda mountain is 1.3 ~ 1.7 mm / a.Considering the deformation of the buried terrace,writers estimate the crustal shortening rate of northern Bogeda mountain is about1.5 ~ 2.0 mm / a since late quaternary in the direction between south and north.

关 键 词：博格达北麓 地壳缩短速率 断弯褶皱 断层扩展褶皱 剩余面积 

分 类 号：P315.2[天文地球—地震学]