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<p>The Altyn Tagh fault zone (ATFZ), which defines the northern boundary of the Tibetan Plateau, is one of the most striking features related to the India/Eurasia collision. Concurrent with the strike-slip movement, vertical uplift, and topographic building have formed a ∼3 000–4 000 m height difference between the Tarim Basin (TB) in the north and the Tibetan Plateau in the south. However, the spatial uplift characteristics and mechanism have not been well understood, particularly in the Late Quaternary. This research presents a comprehensive geomorphic analysis to establish the Late Quaternary tectonic uplift pattern for the entire ATFZ. We statistically excluded climatic and lithological factors that provided prominence for tectonism; combined with leveling data, river incision rate, and seismicity data, we reveal the along-strike and across-fault vertical deformation variations. The spatial distribution of the integrated geomorphic index (<i>IGI</i>) suggests significant differences between the two sides of the ATFZ. The <i>IGI</i> values decrease with slip rates in the northwestern side of the ATF, whereas wave-like in the southeastern side. The significant along-strike deformation difference between the two sides of the ATFZ may cause by differential rheology. These findings are crucial for assessing regional seismic hazards and providing new independent data to understand the Late Quaternary deformation style of the northern boundary of the Tibetan Plateau.</p>

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Asymmetric Deformation along the Altyn Tagh Fault Zone Revealed by Geomorphic Analysis

  • 期刊论文

  • 发表日期：

    2025年8月13日

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  • Mingxing Gao,
  • Yanwu Lyu

摘要

The Altyn Tagh fault zone (ATFZ), which defines the northern boundary of the Tibetan Plateau, is one of the most striking features related to the India/Eurasia collision. Concurrent with the strike-slip movement, vertical uplift, and topographic building have formed a ∼3 000–4 000 m height difference between the Tarim Basin (TB) in the north and the Tibetan Plateau in the south. However, the spatial uplift characteristics and mechanism have not been well understood, particularly in the Late Quaternary. This research presents a comprehensive geomorphic analysis to establish the Late Quaternary tectonic uplift pattern for the entire ATFZ. We statistically excluded climatic and lithological factors that provided prominence for tectonism; combined with leveling data, river incision rate, and seismicity data, we reveal the along-strike and across-fault vertical deformation variations. The spatial distribution of the integrated geomorphic index (IGI) suggests significant differences between the two sides of the ATFZ. The IGI values decrease with slip rates in the northwestern side of the ATF, whereas wave-like in the southeastern side. The significant along-strike deformation difference between the two sides of the ATFZ may cause by differential rheology. These findings are crucial for assessing regional seismic hazards and providing new independent data to understand the Late Quaternary deformation style of the northern boundary of the Tibetan Plateau.