超越冰层:在伊欧纪-奥利古纪过渡期的生产率和碳酸盐过的变化
Allyson Viganò1,2, Claudia Agnini3
1Department of Geosciences, University of Padova, Padua, Italy. allyson.vigano@unipd.it.
Scientific reports
|May 1, 2025
概括
世-世过渡期 (EOT) 见证了全球气候的转变. 一个特定的纳米浮游生物群,Clausicoccus subdistichus,显示了全球规模和丰富度的增加,作为这个主要气候事件的标记.
科学领域:
- 古海洋学是古海洋学.
- 微观古生物学的古生物学
- 气候科学 气候科学
背景情况:
- 大约3400万年前,地球的气候在伊欧纪-奥利古纪过渡期 (EOT) 发生了巨大的变化,从一个温暖的,没有冰期的状态转变为一个更冷的,冰期的,南极冰盖形成.
- 以前的研究表明,石灰质的纳米浮游生物对这种气候转型的反应有限或预先EOT,这意味着对这些关键的海洋生产商的影响最小.
研究的目的:
- 为了研究石灰质纳米浮游生物,特别是克劳西科克斯 (Clausicoccus subdistichus) 群体,对欧 - 奥利古过渡 (EOT) 的反应.
- 为了确定这个纳米浮游生物群体中观察到的变化是否是全球性的,并且与EOT同步.
- 为了确定在EOT期间观察到的纳米浮游生物变化的潜在驱动因素.
主要方法:
- 对Clausicoccus subdistichus群的形态测量和丰度数据的分析.
- 从印度,太平洋和大西洋的多个地点采样 (ODP站点756,IODP站点U1509,ODP站点1209,IODP站点U1411).
- 在各种沉积环境中进行调查,以确认全球模式.
主要成果:
- 观察到Clausicoccus subdistichus群体的大小和丰度 (acme区间) 的同步全球增加.
- 这种纳米浮游生物事件在各种海洋盆地 (印度,太平洋,大西洋) 和沉积环境中被确定.
- 观察到的变化可以作为EOT的可靠全球标记,即使在保存不良的沉积物中也是如此.
结论:
- 克劳西科克斯 (Clausicoccus subdistichus acme) 间隔代表了一个独特的全球指纹,代表了欧 - 奥利古过渡时期 (EOT).
- 这些纳米浮游生物变化的推测驱动因素包括海水中碳酸离子过和海洋逐渐缩的增加.
- 这些变化很可能最终导致了"早期橄世冰川最大值" (EOGM).
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