山东东部新生代岩石圈热结构演化及深部动力机制
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    摘要:

    本研究聚焦岩石圈构造演化与壳幔相互作用机制,针对传统地球化学方法在多期改造过程示踪中的局限性,以华北克拉通及郯庐断裂带为研究对象,集成锆石微区地球化学、同位素示踪数据,系统探讨穿地壳岩浆系统演化规律及其对岩石圈流变结构的控制机制。研究表明,华北东部晚中生代高镁钾质花岗岩与太古宙岩浆岩的地球化学相似性揭示了深部物质再循环过程,而苏鲁超高压变质岩锆石REE特征则记录了多期地壳再造事件。本课题建立锆石Hf-O同位素及构造岩浆活动性质联合分析体系,结合地球物理表征岩石圈结构演化分析,重点解析郯庐断裂带周边壳幔相互作用过程。通过建立构造-岩浆-变质作用的时空耦合模型,阐明岩石圈热结构演变与脆性变形的内在关联,揭示古太平洋板块俯冲与软流圈上涌对克拉通破坏的复合控制机制。对深层高温资源勘探和岩石圈稳定性评估具有重要应用价值。

    Abstract:

    This study focuses on the lithospheric tectonic evolution and crust-mantle interaction mechanism. In view of the limitations of traditional geochemical methods in tracing the multi-stage transformation process, the North China Craton and the Tanlu fault zone are taken as the research objects, and the zircon micro-area geochemical and isotope tracer data are integrated to systematically explore the evolution law of the crustal magma system and its control mechanism on the lithospheric rheological structure. Studies have shown that the geochemical similarity between late Mesozoic high-Mg potassic granites and Archean magmatic rocks in eastern North China reveals the deep material recycling process, while the zircon REE characteristics of Sulu ultra-high pressure metamorphic rocks record multi-stage crustal reconstruction events. In this paper, a joint analysis system of zircon Hf-O isotope and tectonic magmatic activity is established. Combined with geophysical characterization of lithospheric structure evolution, the process of crust-mantle interaction around Tanlu fault zone is analyzed. By establishing a spatio-temporal coupling model of tectonic-magma-metamorphism, the internal relationship between lithospheric thermal structure evolution and brittle deformation is clarified, and the composite control mechanism of ancient Pacific plate subduction and asthenosphere upwelling on craton destruction is revealed. It has important application value for deep high temperature resource exploration and lithospheric stability evaluation.

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  • 收稿日期:2025-05-08
  • 最后修改日期:2025-05-08
  • 录用日期:2025-05-14
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