Abstract: The study fault is located on the northern piedmmont of the Dabie mountain in the western part of Anhui Province with a variety of mylonite zone found on the both flanks.The mylonite zones are parallal to foliations on the axial plane of early fold zone,which was deformed through late folding.The mylonites prove to have formed in the priod of the second-stage tectonic slip in the Proterozoic rather than a cause of the fault rock.A suite of brittle-deformation related imbricate thrust can be found on the southern side of the fault in question along with some ramps.The study fault and these imbricate thrusts cut through the folds consisting of the mylonites.This paper also discusses active block in this region.

摘要： 根据断裂带切割变质围岩中各期变形旋回形成的褶皱,断裂带中的断层岩为形成于地表条件下的角砾岩和碎裂岩并切割围岩中各种糜棱岩带,构成上侏罗统火山岩盆地的边界断层等特征,磨子潭-晓天断裂应是晚侏罗世形成于地表条件下的断层;根据断层附近上侏罗统砂岩夹层中的裂隙焊接,磨子潭-晓天断裂在晚侏罗世形成后,还有两次较强烈的活动。据地表、钻探和地震资料,断层面向北倾,倾角向深部变缓。