Structural styles and impact of fault subsidence in the lake fuxian basin and adjacent area

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Marine Geophysical Research Pub Date : 2024-05-02 DOI:10.1007/s11001-024-09544-5
Aqsa Anees, Hucai Zhang, Umar Ashraf, Xiaonan Zhang, Lizeng Duan
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Abstract

Lake Fuxian is a tectonic lake located on the Yunnan–Guizhou Plateau in southwest China. It is the deepest freshwater tectonic lake in the Yunnan Plateau. The present study focused on examining the structural changes, faulting patterns, and their influence on fault subsidence in the Lake Fuxian basin. Seismic interpretation showed uplift in the SSW area and subsidence in the NNE region. Subsidence is more pronounced on the northern survey lines, where the sedimentary strata had a maximum sedimentation of 1200 m. The seismic interpretation findings showed a horst block in the southern basin and a graben block in the northern half of the basin. L-14 demonstrated the steeper with maximum throw and parallel character of normal faults and provided the evidence of crustal extensional regime. Thirteen main faults were identified by fault modeling in the lake basin. The analysis of fault characteristics revealed that faults in the northern basin are characterized by greater depth, steeper angles, maximum displacement, and are actively moving owing to low resistance and negative asperity values, and poor edge detection values. Faults in the southern basin have an opposite character to those in the northern basin. Major faults in the northern lake basin have a stronger influence of fault subsidence compared to faults in the center and southern lake basins. Overall, the lake Fuxian basin showed horst-graben structure with parallel normal faulting with a crustal extensional regime.

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抚仙湖盆地及邻近地区的构造样式及断层沉降的影响
抚仙湖是位于中国西南部云贵高原的一个构造湖。它是云贵高原最深的淡水构造湖。本研究重点考察了抚仙湖盆地的构造变化、断层形态及其对断层沉降的影响。地震解释显示,西南地区隆起,东北地区下沉。地震解释结果显示,盆地南部为地角块,盆地北半部为地堑块。L-14 显示了正断层的陡峭、最大抛掷和平行特征,并提供了地壳伸展机制的证据。通过断层建模,确定了湖盆中的 13 条主要断层。对断层特征的分析表明,北部盆地的断层具有深度大、角度陡、位移大的特点,并且由于低阻力和负粗糙度值以及较差的边缘探测值,断层运动活跃。南部盆地的断层与北部盆地的断层具有相反的特征。与中部和南部湖盆的断层相比,北部湖盆的主要断层受断层沉降的影响更大。总体而言,抚仙湖盆地呈现地壳伸展型平行正断层的角砾岩构造。
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来源期刊
Marine Geophysical Research
Marine Geophysical Research 地学-地球化学与地球物理
CiteScore
2.80
自引率
14.30%
发文量
41
审稿时长
>12 weeks
期刊介绍: Well-established international journal presenting marine geophysical experiments on the geology of continental margins, deep ocean basins and the global mid-ocean ridge system. The journal publishes the state-of-the-art in marine geophysical research including innovative geophysical data analysis, new deep sea floor imaging techniques and tools for measuring rock and sediment properties. Marine Geophysical Research reaches a large and growing community of readers worldwide. Rooted on early international interests in researching the global mid-ocean ridge system, its focus has expanded to include studies of continental margin tectonics, sediment deposition processes and resulting geohazards as well as their structure and stratigraphic record. The editors of MGR predict a rising rate of advances and development in this sphere in coming years, reflecting the diversity and complexity of marine geological processes.
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