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古代储存异常的同位素签名在地球的过渡区的古代存储
Rong Xu1, Runsheng Yin2, William M White3
1State Key Laboratory of Critical Mineral Research and Exploration, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China. xurong@mail.gyig.ac.cn.
Nature communications
|November 27, 2025
概括
水银同位素分析显示,地幔过渡区 (MTZ) 含有回收的古代沉积物. 这些富含挥发性物质的储库影响了深层地幔羽毛的组成,对地球产生影响.
科学领域:
- 地质化学 地质化学
- 地质物理学 地质物理学
- 石化学 石化学是一门学科.
背景情况:
- 地幔过渡区 (MTZ) 对于理解地球演变至关重要.
- 有证据表明,MTZ可能含有沉积物和挥发物等沉积物,形成丰富的地幔1 (EM1) 储库.
- 在MTZ中,挥发性物质,潜伏成分和地幔末端之间的准确联系尚未完全理解.
研究的目的:
- 为了调查富含挥发性物质的EM1型玄武岩的起源.
- 探索潜沉积物和挥发物在MTZ中的作用.
- 在地球深层地幔中追踪长期的挥发性回收过程.
主要方法:
- 分析来自东北亚的 (Hg) 同位素数据 (Δ199Hg, Δ201Hg, δ202Hg) 在纪内板EM1型玄武岩中.
- 同位素特征与地幔异质性的地化学指标的相关性.
- 在地幔动力学和俯冲过程的背景下解释同位素异常.
主要成果:
- EM1型玄武岩呈现负质量独立分离 (Δ199Hg, Δ201Hg) 和质量依赖分离 (δ202Hg).
- 的同位素数据与地幔异质性的地化学指标相对应,这表明再循环的土壤土壤沉积物被纳入.
- 异常的Hg签名表明,在富含挥发性物质的MTZ内存在古老的回收沉积物.
结论:
- 该MTZ作为一个长期储存回收的古老沉积物具有明显的Hg同位素签名的长期储存.
- 这些沉积物,以及挥发物质,通过涉及水性上游或地幔羽毛的过程被纳入EM1型玄武岩.
- 水银同位素为跟踪地球深层挥发物回收和地幔异质性在地质时间尺度上提供了强大的工具.
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