生物多样化与环境稳定有关,这是斯图尔特斯雪球冰期之后的环境稳定
Fred T Bowyer1,2, Alexander J Krause2,3, Yafang Song2
1School of GeoSciences, University of Edinburgh, James Hutton Road, Edinburgh EH9 3FE, UK.
Science advances
|August 25, 2023
概括
在雪球地球事件之间,生命变得更加复杂,这是由稳定的海洋条件和回收驱动的. 这项研究揭示了营养动力学是如何影响生命早期的.
科学领域:
- 古海洋学是古海洋学.
- 生物地质化学生物地质化学
- 古生物学的古生物学
背景情况:
- 冷时期 (大约. 661 650 亿年前) 经历了两次"雪球地球"冰期.
- 在这些冰期之间,生物复杂性的增加被建议,但控制的环境因素尚不清楚.
- 了解营养和氧化还原动力学对于解释这种生物进化至关重要.
研究的目的:
- 为了研究冰河间时期的古和的动态.
- 为了将这些地化学记录与全球时间层级图谱框架相关联.
- 将环境变化与生物复杂性的增加联系起来.
主要方法:
- 高分辨率分析古氧和相关联.
- 使用全球分布的钻井核心记录.
- 通过石化和化学平分法进行区域相关性,校准到全球时间平分法.
主要成果:
- 区域的氧化还原稳定受到了来自海洋沉积物的循环利用的影响.
- 全球发生了向更稳定的,更少减少浅到中深的海洋条件的转变.
- 这种环境转型与雪球后超级温室状态后的逐步降温相吻合.
结论:
- 回收利用在调节海洋氧化还原状态方面发挥了关键作用.
- 生物复杂性的增加是由改善的海洋环境稳定性所促进的.
- 这些发现为理解早期真核生物进化与地球化学循环相关的理解提供了一个框架.
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