【摘要】 对白云凹陷地震资料的解释分析表明,该凹陷断裂构造以正断层和走滑断裂为主,未见逆断层。在平面上,断裂主要为NWW至近EW走向,不同等级与不同走向断层表现为平行断层系、帚状断层系和雁列断层系等三种断层组合形式。剖面中,单条断层样式相对简单,主要呈现平面式、铲式和座椅式等构造样式;多条断层主要表现为花状组合、马尾状组合、Y字型组合和阶梯状组合等构造特征。通过对断裂活动强度统计发现,不同区域断裂的发育时间和发育强度亦有差异,其中50—30MaBP是断裂的强烈发育期,控制凹陷的同张裂期沉积充填;13.8—10MaBP受东沙运动的影响断裂再次活化,属于中等强度发育期。更多还原

【Abstract】 Baiyun Sag(BYS) lies in the deep water area of the Zhujiang River Mouth Basin(PRMB).It is the largest,deepest and most potential sag in the north margin of the South China Sea.The faults in the BYS are mainly in normal type and may be divided into three groups by orientation,i.e.NWW,E-W and NE,with NWW predominant.On plane view these faults form parallel,fastigiated,and en echelon combinations.In vertical sections these faults form flower,horsetail,or ladder shaped combinations,while a single fault may be of planar,listric,or chair shape.The fault movement velocity varies in difference districts.Statistics indicates that the strongest fault activity occurred during the period of 50—30MaBP and controlled the sag formation and the syn-rifting sedimentation.The faulting rejuvenated in the Dongsha movement(13.8—10MaBP) with secondarily strong activity.更多还原