辽宁东部寒岭—偏岭断裂带深部地质特征

Deep geological features of Hanling-Pianling fault zone in eastern Liaoning

通过对4条高精度重力、高精度磁测和MT实测非震地球物理综合剖面的处理解释,结合已有区域地球物理及野外地质研究,对辽宁东部寒岭—偏岭断裂带的特征进行了研究。根据航磁异常上延结果,认为该断裂为左旋走滑断裂,其最大错断距离约53 km。布格重力异常上延结果表明,与寒岭—偏岭断裂带相关的次级断裂切割深度小,主要发育在沉积盖层中。四条非震综合物探剖面处理解释结果表明,寒岭—偏岭断裂带在不同地段的深部地质产状不同,断裂带西段深部倾向为N,视倾角约为65°;断裂带中段深部倾向NW,视倾角约为60°;断裂带北段深部倾向NW或SE,具有摆动特征,视倾角变化较大,约为35°~50°。

On the basis of the comprehensive interpretation of four high-precision gravity,high-precision magnetic and MT measured non-seismic geophysical profiles,combining with the regional geological data and field geological research,the authors studied the features for the deep Hanling-Pianling fault zone in eastern Liaoning. According to the result of aeromagnetic anomalies upward continuation,it is considered that the fault zone is a sinistral strike-slip fault,and its biggest leap distance is about 53 km. According to Bouguer gravity anomalies upward continuation,there is a shallower cutting depth with Hanling-Pianling fault zone. It mostly developed in the sedimentary cover. The processing and interpretation results of four integrated geophysical profiles show that the occurrences of Hanling-Pianling fault are various in different locations,the deep tendency of the western fault is N,the apparent dip is about 65°; while the deep fault in the middle tends to NW,its apparent dip is about 60°; the north of the deep fault tends to NW and SE,and the change of apparent dip is large about 35° ~ 50° according to its swing feature.