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<p>Investigating the deep interior of Earth, particularly large low-velocity provinces (LLVPs) and ultra-low-velocity zones (ULVZs), is crucial for elucidating mantle convection, core-mantle coupling, and planetary evolution. Existing research identifies significant gaps in knowledge regarding the origins, compositions, and evolutionary processes of these features. This study employs a multidisciplinary approach, integrating dynamical simulations, seismic imaging techniques, and geochemical analyses to comprehensively investigate the formation, evolution, and fate of LLVPs and ULVZs. Key findings reveal that LLVPs predominantly arise from primordial materials and subducted oceanic crust, while ULVZs are primarily products of core-mantle interactions and subduction-related processes. The convective dynamics at the mantle’s base driven by subduction facilitate the evolution of LLVPs into thermochemical reservoirs and the emergence of ULVZs. Notably, LLVPs are intricately linked to the global supercontinent cycle; for instance, the Pacific LLVP is associated with the Rodinia supercontinent’s aggregation, while the Africa LLVP is linked to Pangaea’s formation. This research offers a framework for advancing our understanding of the intricate interactions between Earth’s deep structures and surface tectonics, possibly laying the groundwork for future geodynamic studies.</p>

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The Origin and Evolution of Earth’s Deep Structure

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • Peng Wang

摘要

Investigating the deep interior of Earth, particularly large low-velocity provinces (LLVPs) and ultra-low-velocity zones (ULVZs), is crucial for elucidating mantle convection, core-mantle coupling, and planetary evolution. Existing research identifies significant gaps in knowledge regarding the origins, compositions, and evolutionary processes of these features. This study employs a multidisciplinary approach, integrating dynamical simulations, seismic imaging techniques, and geochemical analyses to comprehensively investigate the formation, evolution, and fate of LLVPs and ULVZs. Key findings reveal that LLVPs predominantly arise from primordial materials and subducted oceanic crust, while ULVZs are primarily products of core-mantle interactions and subduction-related processes. The convective dynamics at the mantle’s base driven by subduction facilitate the evolution of LLVPs into thermochemical reservoirs and the emergence of ULVZs. Notably, LLVPs are intricately linked to the global supercontinent cycle; for instance, the Pacific LLVP is associated with the Rodinia supercontinent’s aggregation, while the Africa LLVP is linked to Pangaea’s formation. This research offers a framework for advancing our understanding of the intricate interactions between Earth’s deep structures and surface tectonics, possibly laying the groundwork for future geodynamic studies.