Chicxulub impact crater hosted hydrothermal oasis for millions of years

When the Chicxulub asteroid collided with Earth roughly 66 million years ago, it triggered catastrophic environmental upheaval—tsunamis, scorching debris, and mass extinction of non-avian dinosaurs. Yet beneath those immediate horrors, the impact's extreme energy carved out something unexpected: a thriving underwater haven.

Heat and hydrothermal systems#

The asteroid struck what is now Mexico's Yucatán Peninsula, plunging into the seafloor and releasing tremendous heat. This energy penetrated kilometres down into the crust, deforming rock layers as far as 35 kilometres below the surface and melting vast volumes of stone. When seawater seeped into the newly fractured rock, it created a hydrothermal system—an underwater network of hot, mineral-rich springs that bubbled through the ocean depths.

A longer-lived oasis than expected#

Researchers who drilled into the impact zone in 2016 collected rock samples to reconstruct the event's aftermath. A team led by geologist Annemarie Pickersgill at the University of Glasgow's SUERC Centre for Isotope Sciences recently re-examined these materials and found that the hydrothermal system persisted far longer than previously believed.

Earlier estimates suggested the system survived roughly 2 million years. The new analysis, based on detailed mineralogical evidence, revealed it actually endured for at least 8 million years—a fourfold revision that dramatically extends the window during which these conditions existed.

A sanctuary for life#

In the frozen, food-scarce depths of the ancient ocean, the warm chemical-rich water gushing from these vents would have been an oasis. Microorganisms and possibly other simple organisms struggling elsewhere in the post-impact world may have found refuge and nourishment in this hydrothermal pocket, turning a zone of destruction into one of unexpected abundance.