地质学
板块构造
太古宙
大陆地壳
结壳
地球内部热量收支
地幔(地质学)
地幔对流
地球科学
早期地球
收敛边界
地体
构造学
大洋地壳
火山弧
地球物理学
地球化学
俯冲
古生物学
作者
Martin J. Van Kranendonk
摘要
Over 4.5 billion years, Earth has evolved from a molten ball to a cooler planet with large continental plates, but how and when continents grew and plate tectonics started remain poorly understood. In this paper, I review the evidence that 3.5 Ga continental nuclei in Australia formed as thick volcanic plateaux over hot, upwelling mantle and survived due to contemporaneous development of a thick, buoyant, unsubductable mantle root. This type of crust is distinct from, but complimentary to, high-grade gneiss terranes that formed through arc-accretion tectonics on what is envisaged as a vigorously convecting early Earth with small plates. Thus, it is proposed that two types of crust formed on early Earth, in much the same way as in modern Earth, but with distinct differences resulting from a hotter Archean mantle. A remaining question of how plate tectonics was initiated on Earth is investigated, using an analogy with Artemis Corona on Venus.
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