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海洋地球化学信号的自然采样和别名
Andrew Curtis1, Hugo Bloem2, Rachel Wood2
1School of GeoSciences, University of Edinburgh, James Hutton Road, Edinburgh, EH9 3FE, UK. Andrew.Curtis@ed.ac.uk.
Scientific reports
|January 4, 2025
概括
沉积岩的记录往往不完整和有偏见. 这项研究使用计算模型来展示沉积过程如何导致别名化,伪装地质化学信号. 更深的海洋记录和配对采样可以帮助克服这些偏见.
科学领域:
- 地质化学 地质化学
- 沉积物学的沉积物学
- 计算地质学的计算地质学
背景情况:
- 沉积物记录是不完整的,并且由于可变的沉积率而有偏差.
- 在没有高分辨率年龄限制的情况下,地质记录的时间相关性是具有挑战性的.
- 使用信号处理对这些偏差进行定量分析是罕见的.
研究的目的:
- 分析海洋沉积和保护过程如何偏向空间和时间地质化学记录.
- 为了证明由于自然采样而导致的地化学记录中的别名效应.
- 提出克服沉积地质化学数据中的异形化策略.
主要方法:
- 利用计算过程模型来模拟沉积和保存.
- 应用信号处理方法,包括尼奎斯特定理,分析别名.
- 检查了相对海平面变化对别名交易的影响.
主要成果:
- 沉积物间隙可以代表很大一部分地质时间.
- 别名将地化学信号不可逆转地伪装成较低的频率,由尼奎斯特定理可以预测.
- 较深的海洋记录更有可能产生未经放弃的环境签名.
- 增加样本分辨率无法纠正缺失沉积物记录引起的异形.
结论:
- 沉积过程固有的偏差地化学记录通过aliasing.
- 由当地的地层学信息为基础的配对采样策略可以帮助从别名记录中推断出真正的地球化学周期.
- 了解和考虑别名化对于准确地质数据解释至关重要.
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