斯图尔纪后雪球海洋边缘的过渡性受精,由粘土矿物质溶解酸盐
Ernest Chi Fru1, Jalila Al Bahri2, Christophe Brosson2
1College of Physical and Engineering Sciences, School of Earth and Environmental Sciences, Centre for Geobiology and Geochemistry, Cardiff University, Cardiff, CF10 3AT, Wales, UK. ChiFruE@Cardiff.ac.uk.
Nature communications
|December 18, 2023
概括
在斯图尔蒂亚雪球地球事件发生后,冰盖融化释放了粘土矿物质,增加了海洋酸盐和氧气. 这种受精支持了早期的动物生活,增加了海洋生产力.
科学领域:
- 地质化学 地质化学
- 古气候学 古气候学
- 海洋生物学 海洋生物学
背景情况:
- 新新生代的海洋岩石表明,雪球后的化肥增强了生产力和氧化,有助于动物进化.
- 生物可用酸盐从陆地到海洋的来源和传递机制尚不清楚.
- 以前的海洋酸盐水平可能在斯图尔特冰期前后限制了初级生产力和氧化.
研究的目的:
- 为了研究斯图尔蒂安雪球地球冰融和海洋酸盐生物可用性增加之间的联系.
- 了解粘土矿物质在冰期后海洋学变化中的作用.
- 确定酸盐施肥对海洋氧化和海洋生态系统的影响.
主要方法:
- 分析了冷纪雪球间隔的海洋沉积岩.
- 地质化学评估粘土矿产生产及其与冰盖融化的关系.
- 推断溶解的海水酸盐动态和海洋氧化水平.
主要成果:
- 证明了斯图尔特纪冰盖融化和粘土矿产生产之间的因果关系.
- 在史图尔特后期,海水酸盐生物可用性增加了20倍以上.
- 在Sturtian海洋边缘后立即观察到增强的氧化.
- 表示低的冰河前和冰河间海洋酸盐库存限制了生产力和氧化.
结论:
- 从融化冰盖中释放的粘土矿物质是雪球后海洋受精的关键机制.
- 提高酸盐的生物可用性和氧化促进了有利于早期动物生命的条件.
- 酸盐限制在Neoproterozoic期间在调节海洋生态系统方面发挥了重要作用.
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