浙江大学学报（理学版）2025，Vol.52Issue(2)：159-171,188,14.DOI:10.3785/j.issn.1008-9497.2025.02.001
珠江口盆地白云凹陷古近系断裂体系特征及形成演化
Characteristics and evolution of Paleogene fault system in Baiyun Sag,Pearl River Mouth Basin
摘要
Abstract
In order to clarify the development characteristics of the Paleogene fault system in Baiyun Sag and deepen the study of sag structure under the ternary coupling control of"preexisting structure,detachment thinning and magmatic intrusion",in this paper,we use the high precision 3D seismic data in depth domain,combined with the methods of structural style identification,quantitative characterization of fault activity and balanced profile evolution to carry out multidimensional research on fault classification,dominant orientation,ordered activity and three-dimensional evolution.The research shows that:(1)There are four levels of faults in Baiyun Sag,including the faults in first-level controlled basin,second-level controlled depression,third-level controlled structural belt and fourth-level controlled trap.There are three dominant directions:NEE,EW and NW.(2)The structural characteristics of Baiyun Sag are significantly different in the west,middle and east.The western part is dominated by high-angle shovel-type depression-controlled faults with two stages and four groups of magmatic intrusion.The central area is characterized by medium-high Angle shovel or seat depression-controlled faults,which can converge with the Moho surface in depth.The eastern area is characterized by the development of gently wave-like low-angle detachment faults,which are invaded by the magma of 2-3 periods,and is a typical"Uplift alternated with depression"structure.(3)There are great differences in activity intensity and activity time among faults of different grades in Baiyun Sag.The controlling effect of faults on deposition appears also as a certain time series.The orderly activity of faults controls the structural evolution and the migration of subsidence center in Baiyun Sag.(4)The Paleogene in Baiyun Sag has undergone five main tectonic evolution stages,namely,initial rifting stage,detachment rifting stage,bottom intrusion rifting stage,fault-depression transition stage and depression stage.Since the Middle Eocene,the structure of Baiyun sag has been transformed from"South fault and north overlying"to"North and south double fault".关键词
断裂体系/断裂活动/拆离断裂/岩浆底侵/白云凹陷Key words
fault system/fault activity/detachment fault/magmatic intrusion/Baiyun Sag分类
地质学引用本文复制引用
范彩伟,邓路佳,孙文钊,吴孔友,周培兴,赵庆奇..珠江口盆地白云凹陷古近系断裂体系特征及形成演化[J].浙江大学学报（理学版）,2025,52(2):159-171,188,14.基金项目
国家自然科学基金资助项目(42272155) （42272155）
青岛海洋科学与技术试点国家实验室"十四五"重大项目(2021QNLM020001). （2021QNLM020001）
