全球冥古宙—太古宙陆壳形成演化
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本文为国家自然科学基金重点项目(编号42130311)、国家自然科学基金联合基金项目(编号U2344210)、中国地质调查局地质调查项目(编号DD20221645,DD20230209)联合资助的成果


Formation and evolution of Hadean- Archean continental crust worldwide
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    摘要:

    地球是太阳系中唯一发育大规模长英质陆壳的星球。陆壳形成演化是一长期的过程。≥3. 8 Ga岩石和≥3. 9 Ga锆石迄今分别只在9个和大约20个地区被发现。随着时代演化,陆壳规模越来越大,表壳岩由以变质玄武岩、变质超基性岩为主转变为变质玄武岩、变质超基性岩、变质中酸性火山岩和变质碎屑沉积岩广泛发育。虽然BIF(条带状铁建造)在3. 8 Ga以前就已存在,但其规模在新太古代晚期—古元古代早期才达到顶峰。TTG(英云闪长岩- 奥长花岗岩- 花岗闪长岩)构成太古宙克拉通的主体,它们的岩石类型和组成特征在3. 8 Ga就显示出多样性。随时代演化,花岗闪长质岩石的比例逐渐增高。TTG的轻重稀土分异程度随时代不断增大,反映了陆壳厚度不断增大的演化趋势。中太古代晚期—新太古代早期发生了全球性的陆壳巨量增生,导致类似于现代板块构造体制在新太古代中晚期广泛发育。富钾花岗岩在新太古代中晚期大量形成,是太古宙基底克拉通化的重要标志。克拉通化的实质是克拉通内不同层圈达到物理、化学和力学上稳定和相互耦合。可把冥古宙—太古宙陆壳形成演化历史划分为四个阶段:4. 4~3. 8 Ga、3. 8~3. 0 Ga、3. 0~2. 6 Ga和2. 6~2. 5 Ga,大致分别代表了陆核形成、陆块发展和形成、克拉通化阶段。太古宙—元古宙关键转折期在地球的演化历史上具有里程碑意义。

    Abstract:

    Earth is unique in our solar system for having developed a large- scale continental crust. The genesis and evolution of this crust is a protracted geological process spanning billions of years. Rocks older than 3. 8 Ga and zircons older than 3. 9 Ga have only been discovered in nine and twenty locations worldwide, respectively. Over geological time, the volume of the continental crust has steadily increased through a complex interaction of tectonic processes. Supracrustal rocks have evolved from mainly meta- basalt and meta- ultrabasic rocks to include meta- basalt, meta- ultrabasic rocks, meta- intermediate- acidic volcanic rocks, and meta- clastic sedimentary rocks. Although banded iron formations (BIFs) predate 3. 8 Ga, their global distribution reached a peak during the late Neoarchean to early Paleoproterozoic. TTG rocks, the dominant constituents of Archean cratons, exhibit a remarkable diversity in rock types and compositions as early as 3. 8 Ga. Over time, the proportion of granodioritic rocks within these cratons gradually increased. Simultaneously, the differentiation degree of light to heavy rare earth elements in TTG rocks increased, reflecting the progressive thickening of the continental crust. A period of significant continental growth occurred during the late Mesoarchean to early Neoarchean, resulting in the widespread development of plate tectonic regimes akin to those observed in the modern era by the late Neoarchean. This period witnessed the voluminous emplacement of K- rich granites, serving as a key indicator of Archean basement cratonization. The essence of cratonization is the physical, chemical, and mechanical stability, along with the intricate interconnectivity of different layers within the craton. The formation and evolution of the Hadean- Archean continental crust can be divided into four stages: 4. 4~3. 8 Ga, 3. 8~3. 0 Ga, 3. 0~2. 6 Ga, and 2. 6~2. 5 Ga. These stages roughly correspond to the formation of the continental nucleus, the development and formation of continental blocks, and cratonization, respectively. The vital transition phase from the Archean to the Proterozoic is of milestone significance in the evolutionary history of the Earth.

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万渝生,颉颃强,谢士稳,刘守偈,马铭株,董春艳,李鹏川,李源.2025.全球冥古宙—太古宙陆壳形成演化[J].地质学报,99(1):1-22.
WAN Yusheng, XIE Hangqiang, XIE Shiwen, LIU Shoujie, MA Mingzhu, DONG Chunyan, LI Pengchuan, LI Yuan.2025. Formation and evolution of Hadean- Archean continental crust worldwide[J]. Acta Geologica Sinica,99(1):1-22.

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  • 收稿日期:2024-10-23
  • 最后修改日期:2024-11-15
  • 录用日期:2024-11-15
  • 在线发布日期: 2024-12-09
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