A team of international researchers has uncovered fresh geochemical evidence linking the catastrophic Siberian Traps volcanic eruptions to the End-Permian mass extinction roughly 252 million years ago — an event that wiped out more than 80 percent of marine species and reshaped life on Earth. The findings, published in late 2024 and continuing to ripple through the geosciences community in 2025, sharpen our understanding of how volcanic carbon emissions can drive runaway climate change, with sobering implications for the modern era.
What the Research Found
The study, led by geochemists analysing mercury isotopes and carbon signatures preserved in sedimentary rock layers spanning the Permian-Triassic boundary, found that the Siberian Traps eruptions released staggering volumes of carbon dioxide, methane, and toxic metals over a period that may have lasted only tens of thousands of years — geologically a blink of an eye. Mercury anomalies in marine sediments from sites in China, Italy, and Canada provided what scientists describe as a “fingerprint” of volcanic activity coinciding precisely with the biotic collapse, as detailed in coverage by Nature.
According to the researchers, the eruptions likely ignited vast underground coal deposits in what is now Siberia, releasing additional greenhouse gases and acidifying the world’s oceans. The combined effect produced lethal ocean anoxia, surface temperature spikes of up to 10°C, and acid rain that devastated terrestrial ecosystems.
Background: The “Great Dying”
The End-Permian extinction, often called the “Great Dying,” remains the most severe biodiversity crisis in Earth’s history. Unlike the asteroid impact that killed the non-avian dinosaurs 66 million years ago, the Permian-Triassic event unfolded primarily through atmospheric and oceanic chemical disruption. Recovery of marine ecosystems took an estimated 5 to 10 million years — far longer than after any other extinction event documented in the fossil record. Background on the broader timeline can be explored through the U.S. Geological Survey, which maintains extensive resources on stratigraphic and paleontological history.
The Siberian Traps themselves cover an area roughly the size of Western Europe, with basaltic lava flows reaching thicknesses of several kilometres in places. For decades, geologists suspected a link between this Large Igneous Province and the extinction, but precise dating and geochemical correlation only became possible with advances in uranium-lead zircon geochronology and isotope mass spectrometry over the past 15 years.
Why This Study Matters
One of the lead authors emphasised that the rate of carbon release during the End-Permian — while enormous — may have been slower per year than current anthropogenic emissions. “What took the Siberian Traps tens of thousands of years to emit, humans are on track to release in centuries,” the team noted in their published findings. That comparison has drawn attention from climate scientists tracking present-day carbon budgets, including those reporting through the Intergovernmental Panel on Climate Change.
The geochemical fingerprinting techniques refined in this study also offer a powerful new tool for investigating other mass extinctions and lesser-known volcanic events. Mercury isotope analysis, in particular, is becoming a go-to proxy for ancient volcanism, helping researchers separate eruptive signals from other environmental disturbances such as wildfires or weathering pulses.
Implications and What to Watch
The implications extend well beyond academic curiosity. Understanding how Earth systems responded to a massive carbon perturbation in deep time provides a natural laboratory for projecting modern climate trajectories. Ocean acidification, deoxygenation, and biodiversity loss — all hallmarks of the End-Permian crisis — are already measurable trends in today’s oceans.
Looking ahead, researchers plan to expand their sampling to additional Permian-Triassic boundary sites in the Southern Hemisphere and refine the timing of extinction pulses to within a few thousand years. New drilling projects in Siberia and southern China are expected to yield further data through 2025 and 2026, potentially clarifying whether the extinction occurred in a single sudden pulse or across multiple staggered phases.
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