华北克拉通大陆地壳的生长与演化:来自锆石U- Pb年代学、微量元素以及Hf- O同位素证据
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本文为国家自然科学基金项目(编号 41903029)资助的成果


Growth and evolution of the North China craton: Evidence from zircon U- Pb geochronology, trace elements and Hf- O isotopes
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    摘要:

    大陆地壳的生长与演化始终是地球科学领域最基本的问题之一。华北克拉通作为全球最古老的克拉通块体之一,广泛经历了早前寒武纪的构造热事件,是探讨大陆地壳生长演化的关键地区。太古宙是地壳生长的主要时期已基本达成了共识,但是对其生长机制还存在争议。本文收集整理了近些年来华北克拉通早前寒武纪公开发表的锆石U- Pb年代学、Th- U元素含量、Lu- Hf同位素以及O同位素数据,旨在探究华北克拉通早前寒武纪大陆地壳的生长与演化。通过分析和处理数据,得到以下结果和认识:① 太古宙—古元古代,特别是新太古代的岩石在华北克拉通广泛发育。其中,中太古代之前的岩石主要分布在东部陆块,中太古代—新太古代岩石也主要集中在东部陆块和中部造山带,西部陆块多分布新太古代—古元古代岩石。② 从中太古代到新太古代,锆石Hf亏损地幔模式年龄与锆石U- Pb年龄相近,说明此时以地壳生长为主;但是新太古代之后,特别是古元古代晚期,锆石的Hf亏损地幔模式年龄明显老于锆石的U- Pb年龄,说明此时地壳以再循环为主。③ 绘制的华北克拉通早前寒武纪大陆地壳生长曲线显示中太古代—新太古代为地壳的快速增长期,而中太古代之前和古元古代晚期地壳生长较为缓慢。④ 新太古代晚期和古元古代晚期锆石Th、U元素含量,Th/U比值及氧同位素的显著变化,标志着地球动力学机制的明显转变。新太古代晚期的地壳生长与板片的俯冲具有密切的关系,说明类似现代的板块构造体制已经启动。

    Abstract:

    Exploring the growth and evolution of continental crust has always been one of the most fundamental challenges in Earth sciences. As one of the oldest cratonic blocks, the North China craton, which extensively records early Precambrian tectono- thermal events, is a key area for investigating this issue. Although there is a basic consensus that the Archean is the main period of crustal growth, the growth mechanism is still controversial. This paper summarizes recent studies on zircon U- Pb geochronology, Th- U contents, and Hf- O isotope data from early Precambrian studies across the North China craton, aiming to explore the growth and evolution of its continental crust. Our findings reveal the following: ① Archean to Paleoproterozoic rocks, especially Neoarchean rocks, are widely developed in the North China craton. Pre- Mesoarchean rocks are predominantly distributed in the Eastern block, while Mesoarchean to Neoarchean rocks are mainly concentrated in the Eastern block and the Trans- North China Orogen. In contrast, the Western block is dominated by Neoarchean to Paleoproterozoic rocks. ② The Hf- depleted mantle model ages closely match the U- Pb ages of Mesoarchean- Neoarchean zircons, suggesting dominant crustal growth during this period. However, after the Neoarchean, especially in the late Paleoproterozoic, the Hf- depleted mantle model ages of the zircons are significantly older than their U- Pb ages, indicating a shift to crustal recycling as the dominant process. ③ The Precambrian continental crust growth curve for the North China craton reveals rapid growth during the Mesoarchean and Neoarchean, with slower growth rates in the pre- Mesoarchean and late Paleoproterozoic. ④ Significant changes in zircon Th and U contents, Th/U ratios, and oxygen isotopes in the late Neoarchean and Paleoproterozoic mark a shift in geodynamic mechanisms. The late Neoarchean crustal growth was dominated by horizontal growth associated with subduction, indicating that modern- style plate tectonics likely initiated during the Neoarchean.

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王欣,王雪,陈建,孟元库.2025.华北克拉通大陆地壳的生长与演化:来自锆石U- Pb年代学、微量元素以及Hf- O同位素证据[J].地质学报,99(7):2463-2478.
WANG Xin, WANG Xue, CHEN Jian, MENG Yuanku.2025. Growth and evolution of the North China craton: Evidence from zircon U- Pb geochronology, trace elements and Hf- O isotopes[J]. Acta Geologica Sinica,99(7):2463-2478.

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  • 收稿日期:2024-04-15
  • 最后修改日期:2024-09-09
  • 录用日期:2024-09-11
  • 在线发布日期: 2025-02-05
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