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黄河口凹陷新生代断裂复杂多样,岩浆活动频繁。利用三维地震资料,根据断裂体系特征、构造演化分析、地层厚度变化及钻井资料等,研究黄河口凹陷南斜坡新生代断裂构造特征及演化规律,分析断裂体系在古新世—早始新世断陷期、晚始新世—渐新世强走滑与强拉张期、新近纪走滑与热沉降期三个阶段的区域应力背景及演化特征。结果表明:研究区断裂体系划分为走滑断裂、拉张—走滑断裂和走滑—拉张断裂等三种断裂类型,以及“阶梯状”“负花状”“雁列式”和“复合花状”等四种断裂组合类型,并具有“三元”构造层结构特征;岩浆活动规律与断裂演化史具有同步性,断裂体系演化规律控制岩浆活动的时空差异性。该研究结果对复杂构造区断裂解释和岩浆活动模式建立具有参考意义。
The Cenozoic faults in the Huanghekou sag are complex and diverse, and the magmatic activity is frequent. Based on the characteristics of fault system, tectonic evolution analysis, stratigraphic thickness variation and drilling data, the structural characteristics and evolution of Cenozoic faults in the southern slope of the Yellow River estuary depression are studied by using 3D seismic data. Depression, Late Eocene - Strong regional strike - slip and strong pull Zhang, Neogene slippage and thermal subsidence of the three stages of regional stress background and evolution characteristics. The results show that the fault system in the study area is divided into three types of faults, such as strike-slip faults, tensile-strike-slip faults and strike-slip-pull faults, and the “staircase” “negative flower And the ”composite flower“ and other four types of fault combination, and has a ”ternary " tectonic structure characteristics; magmatism and fault evolution history of the synchronicity, the evolution of the fault system to control magmatic activity Space-time difference. The results of this study have reference significance for the interpretation of faults and the establishment of magmatic activity modes in complex tectonic areas.