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March 6, 2026Science AdvancesOpen Access

Refined chronologies of magnetochron M0r reveal asynchronous terrestrial and marine carbon isotope responses to Oceanic Anoxic Event 1a

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Authors

GLGui‐Mei LuZSZhen ShenCDCheng-Long Deng

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Overview

Refined chronologies show asynchronous carbon cycles in terrestrial and marine environments, suggesting revised CO2 emission timelines.

Key Points

  • This research aims to clarify the timing of the carbon isotope response to OAE1a in both terrestrial and marine settings.
  • Conducted high-resolution cycle-calibrated magnetostratigraphic analyses.
  • Analyzed a continuous drill core from the Lower Cretaceous Jiufotang Formation.
  • Constrained the age of Chron M0r termination to 121.26 ± 0.38 Ma.
  • The carbon isotope excursion related to OAE1a occurred 1.24 ± 0.4 Myr after the termination of Chron M0r.
  • This temporal offset is significantly longer than the 0.3 to 0.66 Myr offset seen in marine records.
  • The findings challenge the hypothesis of rapid atmospheric CO2 emissions at the start of OAE1a.

Cite This Study

Lu et al. (2026) studied this question.

synapsesocial.com/papers/69aa701a531e4c4a9ff598b8https://doi.org/10.1126/sciadv.aea8374
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