Sorbonne Université, CNRS, Institut des Sciences de la Terre Paris, Paris F-75005, France.
Astronomie et Systèmes Dynamiques/Institut de Mécanique Céleste et de Calcul des Ephémérides, CNRS-UMR8028, Observatoire de Paris, Paris Sciences & Lettres University, Sorbonne Université, Paris 75014, France.
Proc Natl Acad Sci U S A. 2023 Jul 18;120(29):e2221149120. doi: 10.1073/pnas.2221149120. Epub 2023 Jul 10.
The fossil record reveals that biotic diversity has fluctuated quasi-cyclically through geological time. However, the causal mechanisms of biotic diversity cycles remain unexplained. Here, we highlight a common, correlatable 36 ± 1 Myr (million years) cycle in the diversity of marine genera as well as in tectonic, sea-level, and macrostratigraphic data over the past 250 Myr of Earth history. The prominence of the 36 ± 1 Myr cycle in tectonic data favors a common-cause mechanism, wherein geological forcing mechanisms drive patterns in both biological diversity and the preserved rock record. In particular, our results suggest that a 36 ± 1 Myr tectono-eustatically driven sea-level cycle may originate from the interaction between the convecting mantle and subducting slabs, thereby pacing mantle-lithospheric deep-water recycling. The 36 ± 1 Myr tectono-eustatic driver of biodiversity is likely related to cyclic continental inundations, with expanding and contracting ecological niches on shelves and in epeiric seas.
化石记录表明，生物多样性在地质时间上几乎呈周期性波动。然而，生物多样性循环的因果机制仍未得到解释。在这里，我们强调了过去 2.5 亿年地球历史中海洋属多样性以及构造、海平面和宏观地层数据中共同存在的、可关联的 36±1 百万年（Myr）周期。在构造数据中，36±1 Myr 周期的突出表现有利于共同成因机制，其中地质强迫机制驱动生物多样性和保存岩石记录中的模式。特别是，我们的研究结果表明，36±1 Myr 的构造-海平面驱动的周期性循环可能源于对流地幔和俯冲板块之间的相互作用，从而调节地幔-岩石圈深部水循环。生物多样性的 36±1 Myr 构造-海平面驱动因素可能与周期性的大陆淹没有关，这导致了大陆架和内陆海生态位的扩张和收缩。
