古构造对新生代断裂过程的影响:南海东北部地震反射成像的启示

IF 2.6 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Zongdong Pan , Shaoping Lu , Hongfang Gao , Qing He , Han Chen , Xiao Ge
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引用次数: 0

摘要

中国南海(SCS)的开辟是由于古太平洋俯冲压缩环境的延伸。先前存在的构造对裂谷盆地的几何形状和裂谷的运动演化有重大影响。然而,古太平洋俯冲作用在南中国海东北部的构造证据仍然是个谜。作为古俯冲构造证据的变形前沿与吸积式变形有关,并将在随后的延伸阶段被重新激活。在本研究中,我们利用多道地震剖面研究了与南中国海东北部古太平洋俯冲相关的先存结构,强调了先存结构对裂谷演化的影响。地震剖面显示了下地壳的覆瓦状反射。这些反射被解释为古太平洋俯冲的变形前沿。值得注意的是,变形前沿在潮汕凹陷处过度拉伸。拉伸因素的结果表明,潮汕坳陷下的韧性下地壳在断裂过程中发生了优先减薄。在剖面的北部,发现了一条透明的反射带,解释为与中生代俯冲有关的岩浆弧。我们研究的主要成果之一是这些地震反射提供了古太平洋俯冲的构造证据,揭示了大陆架东北部通过一系列倾覆推力经历了地壳缩短和嵌合。随后,我们讨论了原有结构在下地壳减薄和大陆裂解中的作用。我们提出,中生代俯冲的变形前沿作为一个预先存在的薄弱环节,促进了新生代期间大陆架裂的运动演化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The effect of pre-existing structures on the Cenozoic rifting processes: Insights from seismic reflection imaging of the northeastern south China sea

The South China Sea (SCS) opened due to the extension of a compressional setting of the paleo-Pacific subduction. The pre-existing structure significantly influences the geometry of rift basins and the kinematic evolution of the rifting. However, structural evidence of the paleo-Pacific subduction in the northeastern SCS remains enigmatic. The deformation front, serving as the structural evidence of paleo-subduction, is associated with accretionary style deformation and would be reactivated during the subsequent extension phase. In this study, we use a multi-channel seismic profile to investigate the pre-existing structure related to the paleo-Pacific subduction in the northeastern SCS, emphasizing the influence of pre-existing structure on the rift evolution. The seismic profile reveals imbricate reflections in the lower crust. These reflections are interpreted as the deformation front of the Paleo-Pacific subduction. Notably, the deformation front is hyperextended in the Chaoshan Depression. The result of the stretching factors indicates that the ductile lower crust experienced preferential thinning during the rifting beneath the Chaoshan Depression. In the northern part of the profile, a transparent reflection zone was identified and interpreted as a magmatic arc related to Mesozoic subduction. One major achievement of our study is these seismic reflections provide the structural evidence for Paleo-Pacific subduction and reveal that the northeastern SCS has experienced crustal shortening and imbrication through a series of dipping thrusts. Subsequently, we discuss the role of pre-existing structures in lower crustal thinning and continental rifting. We propose the deformation front of the Mesozoic subduction, as a pre-existing weakness, facilitated the kinematic evolution of the rifting in the northeastern SCS during the Cenozoic.

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来源期刊
Journal of Structural Geology
Journal of Structural Geology 地学-地球科学综合
CiteScore
6.00
自引率
19.40%
发文量
192
审稿时长
15.7 weeks
期刊介绍: The Journal of Structural Geology publishes process-oriented investigations about structural geology using appropriate combinations of analog and digital field data, seismic reflection data, satellite-derived data, geometric analysis, kinematic analysis, laboratory experiments, computer visualizations, and analogue or numerical modelling on all scales. Contributions are encouraged to draw perspectives from rheology, rock mechanics, geophysics,metamorphism, sedimentology, petroleum geology, economic geology, geodynamics, planetary geology, tectonics and neotectonics to provide a more powerful understanding of deformation processes and systems. Given the visual nature of the discipline, supplementary materials that portray the data and analysis in 3-D or quasi 3-D manners, including the use of videos, and/or graphical abstracts can significantly strengthen the impact of contributions.
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