郯庐断裂带辽东湾段新生代右旋走滑时限的探讨

李伟, 李嘉, 吴宛秋, 张同杰, 陈兴鹏, 蒙美芳, 曹明月, 张巧

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地球科学 ›› 2024, Vol. 49 ›› Issue (06) : 2071-2084. DOI: 10.3799/dqkx.2022.480

郯庐断裂带辽东湾段新生代右旋走滑时限的探讨

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Time Limit of Dextral Strike-Slip in Cenozoic of Liaodong Bay Section of Tan-Lu Fault Zone

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摘要

新生代郯庐断裂带经历了复杂的演化过程,争议主要集中在右旋走滑开始的时期.以渤海海域郯庐断裂带辽东湾段为例,基于各种地质、地球物理资料及前人研究成果,从构造学和沉积学两个方面基于多种证据系统探讨了郯庐断裂带的右旋走滑活动时限.结果表明:郯庐断裂带辽东湾段走滑活动切割改造了早期(孔店组-沙三段沉积期)伸展断裂系统,R剪切断裂形成于渐新世晚期东营组沉积期,走滑派生构造主要发育在东营组沉积期至今;郯庐断裂带辽东湾段的右旋走滑活动错开了先期(孔店组-沙河街组沉积期)形成的沉积体,同沉积期走滑活动导致了鱼跃式砂体、轴向或斜向砂体的发育展布,弯曲走滑断裂的释压作用控制了的局部洼陷的形成.郯庐断裂带辽东湾段新生代右旋走滑主要在古近纪渐新世晚期东营组沉积期,此后逐渐减弱、持续至今.

Abstract

The Tan-Lu Fault Zone has undergone a complex evolutionary process during Cenozoic, and the controversy is mainly focused on the period of the beginning of dextral strike-slip. In this paper, based on various geological and geophysical data and previous research results, taking the Liaodong Bay Section in Bohai Sea as an example, the time limit of dextral strike-slip activity of the Tan-lu fault zone is systematically discussed from both tectonic and sedimentological aspects based on various evidence. The results show that the dextral strike-slip activity of the Liaodong Bay Section of the Tan-Lu fault zone cut and modified the early (Kongdian-the third member of Shahejie formation depositional period) extensional faults, the R-shear fracture was formed in the Late Oligocence Dongying Formation depositional period, and the strike-slip derived structures were mainly developed in the Dongying Formation depositional period until now. The dextral strike-slip activity in the Liaodong Bay Section of the Tan-Lu fault zone staggered the sedimentary bodies formed in Early and Middle Paleogene(Kongdian-Shahejie formation depositional period), and the syndepositional dextral strike-slip activity led to the development and spreading of fish-jumping sand bodies, axial or oblique sand bodies, and the local depression formation controlled by the pressure release effect of bending strike-slip fault. The dextral strike-slip in Cenozoic of the Liaodong Bay Section of the Tan-Lu fault zone was mainly during the depositional period of the Dongying Formation in the Late Oligocene of the Paleogene, and then gradually weakened and continued until now.

关键词

右旋走滑 / 活动时限 / 辽东湾坳陷 / 新生代 / 郯庐断裂带 / 石油地质.

Key words

dextral strike-slip / activity time limit / Liaodong Bay depression / Cenozoic / Tan-Lu fault zone / petroleum geology

中图分类号

P618

引用本文

导出引用
李伟 , 李嘉 , 吴宛秋 , . 郯庐断裂带辽东湾段新生代右旋走滑时限的探讨. 地球科学. 2024, 49(06): 2071-2084 https://doi.org/10.3799/dqkx.2022.480
Li Wei, Li Jia, Wu Wanqiu, et al. Time Limit of Dextral Strike-Slip in Cenozoic of Liaodong Bay Section of Tan-Lu Fault Zone[J]. Earth Science. 2024, 49(06): 2071-2084 https://doi.org/10.3799/dqkx.2022.480

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致谢

感谢两位匿名评审专家对本文提出的宝贵修改意见.

基金

中海油课题资助(CCL2013TJXSBS1881-03)

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