Astronomically calibrating early Ediacaran evolution
Zhang, T.; Ma, C.; Li, Y.; Li, C.; DaSilva, A.; Fan, T.; Gao, Q.; Kuang, M.; Liu, W.; Li, M.; Hou, M. (2025). Astronomically calibrating early Ediacaran evolution. Nature Comm. 16(1): 3049. https://dx.doi.org/10.1038/s41467-025-57201-1
In: Nature Communications. Nature Publishing Group: London. ISSN 2041-1723; e-ISSN 2041-1723, meer
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| Author keywords |
lower doushantuo formation;ocean oxygenation;snowball earth;cap carbonate;low-latitude;south china;time-scale;cyclostratigraphy;glaciation;rodinia |
| Auteurs | | Top |
- Zhang, T.
- Ma, C.
- Li, Y.
- Li, C.
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- DaSilva, A., meer
- Fan, T.
- Gao, Q.
- Kuang, M.
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| Abstract |
The current low-resolution chronostratigraphic framework for the early Ediacaran Period hampers a comprehensive understanding of potential trigger mechanisms for environmental upheavals and their connections to evolutionary innovation. Here, we establish a high-resolution astrochronological framework spanning similar to 57.6 million years of the early Ediacaran, anchored by the radioisotopic date of the Gaskiers glaciation onset, based on key sections from South China. Constrained by multiple radioisotopic dates, this framework precisely constrains the timing of the Marinoan deglaciation, Ediacaran Negative carbon isotope excursions 1 and 2 (EN1 and EN2), and key fossil assemblages (acanthomorphic acritarchs, Weng'an and Lantian biotas). These dates indicate the rapid termination of the Marinoan glaciation in South China within 10(6)-10(7) years, while providing robust temporal evidence for the global synchroneity of EN1, EN2, and Marinoan deglaciation. The integrated chronology refines the age model for early Ediacaran biotic evolution, revealing that ecosystems gradually increased in complexity over multi-million-year timescales while global taxonomic diversity remained relatively stable, punctuated by rapid transitions to novel communities coinciding with biogeochemical perturbations. |
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