太平洋岩石圈热演化研究

本项目申请通过利用日益改进与完善的水深、重力、磁力、热流等资料，进一步完善已有的反演算法，结合有限元数值模拟等技术手段，综合研究整个太平洋内不同岩石圈的强度（岩石圈有效弹性厚度）、热结构（有效平均热导率、热岩石圈厚度、莫霍面温度等）与热演化特征，进而分析太平洋岩石圈的冷却过程与深部热异常，广泛发育的海底海山链与大规模火成岩省的成因及其与地温结构的关系，扩张中心与转换断层的演变，以及它们对周围大陆特别是对欧亚板块内构造事件影响。探讨太平洋上地幔顶部磁化（磁性层结构）和蛇纹岩化的可能程度与机理。相关成果将帮助理解行星地球的演化与深部过程、海底矿产资源的分布、大陆边缘资源与灾害，同时会帮助推进中国的“一带一路”等全球战略，提升我国科学家在国际海域的研究水平和话语权。

This project plans to utilize constantly improving bathymetry, gravity, magnetics, and heat flow data and numerical modeling techniques to explore the lithospheric strength (effective elastic thickness), thermal structure (effective thermal conductivity, thickness of thermal lithosphere, and Moho temperature), and their evolution with the crustal age in the Pacific. The inversion techniques will be further polished to accommodate large datasets. We will examine cooling processes and thermal anomalies of lithospheres in the Pacific, possible emplacement mechanisms of numerous seamount chains and large igneous provinces and their links to observed thermal structures, thermal anomalies of spreading centers and transform faults, and how these structures and their evolutional patterns affect tectonics in the surrounding plates, particularly the Eurasian plate. We will also discuss the mechanism and extent of possible uppermost mantle magnetization (structure of the magnetic layer) and serpentinization. The results of this study will help understand the evolution and deep structures of the planet Earth, distribution of deep marine resources, and resources and hazards at the continental margins. This planned study will also help promote the global strategy of "One Belt and One Road", and elevate the research and discourse level of Chinese scientists.