Oceanic anoxic events (OAEs) are significant historical intervals of ocean deoxygenation driven by massive volcanic CO2 emissions, with the OAE1a event illustrating this through prolonged deoxygenation.
The Early Cretaceous OAE1a persisted for over 1 million years, demonstrating a link between volcanic CO2 emissions and ocean deoxygenation alongside climate dynamics which delayed reoxygenation.
Our research underscores the importance of volcanic activity in altering marine chemistry, suggesting that the timing and interactions between these events are crucial for understanding ancient oceanic conditions.
Following OAE1a, persistent high temperatures led to ongoing cyclic deoxygenation events driven by orbital changes, highlighting the complex interactions between climate thresholds and ocean oxygenation.
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