地幔羽流对大陆裂谷演化的影响:东非大裂谷系统案例研究

Q1 Earth and Planetary Sciences
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引用次数: 0

摘要

地幔羽流是地幔对流系统的重要组成部分,它对大陆裂谷地球动力学的影响对理解地壳与地幔相互作用具有重要意义。东非大裂谷系统作为新生代最大的大陆裂谷,且处于初始阶段,为研究地幔羽流与大陆地壳之间的相互作用提供了绝佳的选择。基于全球定位系统、地震层析成像和全球地壳模型等数据,建立了粘弹塑性二维热力学数值模型,重建了阿法尔凹陷、埃塞俄比亚裂谷和肯尼亚裂谷的演化过程。通过比较阿法尔凹陷、埃塞俄比亚裂谷和肯尼亚裂谷模型之间的差异,讨论了地幔羽流与原有结构之间的关系及其对大陆裂谷演化的影响。结果表明,地幔羽流可以增加裂谷断层的深度,集中断层的分布,加强主断层对裂谷的控制,使裂谷可能变窄。先前存在的结构控制着裂谷的断层类型和对称性,也控制着地幔羽流的形态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of mantle plume on continental rift evolution: A case study of the East African rift system

Mantle plume is an essential component of the mantle convection system, and its influence on the geodynamics of continental rifts is of great significance for understanding the crust–mantle interaction. The East African Rift System, as the largest continental rift in the Cenozoic and in the initial stage, provides an excellent option for studying the interaction between the mantle plume and the continental crust. Based on the data such as GPS, seismic tomography, and global crustal model, a viscoelastic-plastic 2D thermodynamic numerical model is established to reconstruct the evolution of the Afar depression, Ethiopian Rift, and Kenyan Rift. By comparing the differences between the models of the Afar depression, Ethiopian Rift, and Kenyan Rift, the relationship between the mantle plume and pre-existing structures and their influence on the evolution of continental rifts are discussed. The results show that the mantle plume can increase the depth of the rift faults, concentrate the distribution of the faults, and strengthen the control of main faults on the rifts, allowing the possibility of narrow rifts. Pre-existing structures control the fault styles and symmetry of the rifts and also the morphology of the mantle plume.

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来源期刊
Petroleum Research
Petroleum Research Earth and Planetary Sciences-Geology
CiteScore
7.10
自引率
0.00%
发文量
90
审稿时长
35 weeks
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