在过去的8000万年里,海洋埋葬的插曲性加剧
Jinzhou Peng1, Dengfeng Li2, Simon W Poulton3
1School of Marine Sciences, Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Sun Yat-sen University, Zhuhai, China.
Nature communications
|August 28, 2024
概括
与氧气最小区相关的海洋化事件,使用U-Pb在海上铁岩皮上进行了日期测定. 这些发现揭示了由气候变化驱动的全球循环扰乱.
科学领域:
- 海洋地质学 海洋地质学
- 古海洋学是古海洋学.
- 地质时间学 (Geochronology)
背景情况:
- 海洋化事件偶尔会在海底山上沉碳酸酸 (CFA),通常与铁 (Fe-Mn) 地生长缺陷相关.
- 了解这些事件的完整记录和古环境意义受不确切的年龄限制所限制.
研究的目的:
- 为了确定海洋化事件的精确时间表,使用Fe-Mn地内的CFA的U-Pb约会.
- 调查与这些化事件相关的古老环境条件.
主要方法:
- 在西太平洋海山的铁 (Fe-Mn) 皮层中碳酸酸酸盐 (CFA) 的U-Pb约会.
- 与现有的Sr同位素数据进行U-Pb年龄的交叉验证.
- 多代理分析用于重建古海洋学条件.
主要成果:
- 六个不同的化事件被识别和日期,提供了改进的年龄限制.
- CFA 年代表与 Sr 同位素年龄很好地一致,完善了 Fe-Mn 的年龄框架.
- 化事件与海洋氧气最小区的扩张相吻合.
结论:
- 海底山上的海洋化事件与全球海洋循环的重大扰动有关.
- 这些干扰似乎是由气候引起的初级生产率增加所驱动的,而初级生产率受到海洋循环变化的影响.
- 铁岩可以作为记录过去海洋变化的宝贵档案.
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