红河断裂带第四纪右旋走滑与尾端拉张转换关系研究

红河断裂带早第四纪以来发生的大规模右旋走滑运动，导致断裂北段尾端的质量亏损，形成了拉张区。右旋走滑量为７．１ｋｍ左右，拉张区右旋方向上的扩张量为５．３５ｋｍ左右，二者相互转换的量级是基本一致的，从而定量地证实了它们之间的成因联系

A STUDY ON THE RELATION BETWEEN QUATERNARY RIGHT-LATERAL SLIP AND TIP EXTENSION ALONG THE HONGHE FAULT

Since Quaternary,large-scale right-lateral movement has occurred along the Honghe fault.It leads to mass loss and results in extensional area at the tip of the northern segment of the fault.In spatial distribution the strike-slip segment and the extensional area are correlated each otherand belong to a system.The direct evidence for strike-slip of the fault includes a number of phenomena such as linear geomorphic feature,steep fault plane,nearly horizortal fault scratch,and water-system offset.The extensional area is indicated by the en echelon normal faults,basins,turns and branches of the fault end which were developed on the northern segment of the Honghe fault.The activity of the strike-slip segment and fractures and basins in the extensional area is synchronous and occurred in Quaternary.The right-lateral strike-slip occurring along the strikeslip segment of the fault is about 7.1km,which was transformed into the extensional area at the end of the fault associated with the block motion.The amount of extension in the right-lateral direction of the extensional area is about 5.35km,comparable to the strike-slip movement.Therefore the genetic relationship between the two types of tectonic deformation has been confirmed quantitatively.