EGU21-13809, updated on 09 Jan 2024
EGU General Assembly 2021
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Astronomically paced marine biological evolution during the Late Paleozoic icehouse-to-greenhouse transition

Qiang Fang1,2, Huaichun Wu1,2, Shuzhong Shen3,4, Junxuan Fan3,4, Linda Hinnov5, Shihong Zhang1, and Tianshui Yang1
Qiang Fang et al.
  • 1State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China
  • 2School of Ocean Sciences, China University of Geosciences, Beijing 100083, China
  • 3State Key Laboratory for Mineral Deposits Research and School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
  • 4Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210023, China
  • 5Department of Atmospheric, Oceanic, and Earth Sciences, George Mason University, Fairfax, Virginia 22030, USA

Late Paleozoic deglaciation is the Earth’s first icehouse-to-greenhouse transition in a vegetated world, but the climatic and biological responses to this transition have not yet been fully addressed. We conducted cyclostratigraphic analysis on the magnetic susceptibility from a deep marine carbonate succession in South China, to reconstruct the astrochronology of the late Early Permian, and to decipher evolutionary responses to astronomically forced climate changes in a marine diversity time series. Our results indicates that the minima of ~1.8 m.y. short orbital eccentricity amplitude modulation cycles led to seasonally stable precipitation patterns and a constant input of nutrients, which spurred marine biodiversity during this deglaciation. Synchronizing global biotic and abiotic records reveals that peaks of marine biodiversity occurred during nodes of ~1.3 m.y. obliquity amplitude modulation cycles, when ice sheet expansion triggered enhanced precipitation and organic carbon burial during icehouse conditions (290−285.1 Ma). Starting at 285.1 Ma, the insolation-biodiversity relationship began to change, paced by glacial termination and tropical aridification. With the transition to greenhouse conditions (~279.1−272 Ma), obliquity nodes became associated instead with terrestrial aridity and marine anoxia, and suppression of marine speciation. Our results bring into focus a pattern of shifting dynamics involving Earth’s astronomical parameters, climate change and marine biodiversity for icehouse and greenhouse worlds in the late Paleozoic Era.

How to cite: Fang, Q., Wu, H., Shen, S., Fan, J., Hinnov, L., Zhang, S., and Yang, T.: Astronomically paced marine biological evolution during the Late Paleozoic icehouse-to-greenhouse transition, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-13809,, 2021.