郯庐断裂带苏皖交界段活动特征初探

Segment Activity Characteristics of the Tan-Lu Fault Zone in the Jiangsu-Anhui Boundary Area

以郯庐断裂带苏皖交界段淮河以南段为重点,开展地形地貌、断层露头等调查工作,并开挖地质探槽,发现该段断层错断了中更新世地层。对比淮河以北段的断裂活动特征,认为郯庐断裂带苏皖交界段在淮河以南虽然第四纪仍有过活动,但其活动强度较弱,而该地区其他方向的断裂截切作用是其活动性减弱的一个可能原因。

The structure of Tan‐Lu fault zone in the Jiangsu‐Anhui boundary area is very complex .This segment can be divided into two parts by the Huaihe river and their tectonic active characteristics are very different .With an emphasis on the south part ,the fault segment is investigated according its topography , fault section ,trench excavation .T he result show s that the fault has dislocated the the stratum of middle Pleistocene .Compared with the north part ,the tectonic active of south part in Quaternary was clearly weak .The cutting action of faults in other direction may be one of the possible reasons for the weakening .