近日，澳大利亚国立大学David L. Huston团队提出了太古宙地球动力学和板块构造与铅同位素变异有关。2025年9月8日，《地质学》杂志发表了这一成果。

了解地球早期的岩浆结构对重建地球动力学演化至关重要。

研究组对来自矿床的~25,000 Pb同位素进行了全球分析，以太古宙克拉通为中心，研究岩石圈演化和大陆构造。模型年龄和强度μ (²³⁸U/²⁰⁴Pb)的空间格局揭示了与太古宙超克拉通一致的同位素域。低µ值是被解释为属于约2.6 Ga Superia超克拉通的克拉通的特征（例如，Superior[加拿大]、Kaapvaal[南部非洲]和Hearne[加拿大]克拉通），而中等至高µ值是与同时期Sclavia超克拉通相关联的克拉通（例如，Slave[加拿大]，Yilgarn[澳大利亚]，Dharwar[印度]和津巴布韦[南部非]克拉通的典型克拉通）。

这些长寿命的地体尺度特征表明，铅同位素可以解析多个克拉通中保存的岩石圈域。该研究结果为太古宙大陆组合提供了新的地球化学约束，并强调了矿床铅同位素数据在测试早期地球板块构造中的实用性。

附：英文原文

Title: Archean geodynamics and plate tectonics linked to Pb isotope variability

Author: Sheree E. Armistead, Bruce M. Eglington, Sally J. Pehrsson, David L. Huston

Issue&Volume: 2025-09-08

Abstract: Understanding Earth’s early crustal architecture is critical to reconstructing the planet’s geodynamic evolution. We present a global analysis of ～25,000 Pb isotope analyses from ore deposits, focusing on Archean cratons to investigate lithospheric evolution and continental configurations. Spatial patterns in model age and source μ (238U/204Pb) reveal isotopic domains that align with proposed Archean supercratons. Low μ values are characteristic of cratons interpreted to belong to the ca. 2.6 Ga Superia supercraton (e.g., Superior [Canada], Kaapvaal [southern Africa], and Hearne [Canada] cratons), whereas moderate to high μ values are typical of cratons associated with the contemporaneous Sclavia supercraton (e.g., Slave [Canada], Yilgarn [Australia], Dharwar [India], and Zimbabwe [southern Africa] cratons). These long-lived terrane-scale signatures suggest Pb isotopes can resolve lithospheric domains preserved across multiple cratons. Our results offer new geochemical constraints on Archean continental assembly and highlight the utility of ore-deposit Pb isotope data for testing early Earth plate configurations.

DOI: 10.1130/G53553.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G53553.1/661081/Archean-geodynamics-and-plate-tectonics-linked-toredirectedFrom=fulltext