The asteroid impact that wiped out the dinosaurs 66 million years ago is often remembered as one of the most destructive events in Earth’s history.
However, new research suggests that the same catastrophe may also have created an underground environment where life could thrive for millions of years.
An international team of scientists has found evidence that a vast underground hydrothermal system beneath the famous Chicxulub crater in Mexico remained active for at least 8 million years after the impact.
That is about four times longer than previous estimates and makes it the longest-lasting impact-generated hydrothermal system ever identified.
The findings, published in Communications Earth & Environment, could help scientists better understand how life first emerged on Earth and where life might be found on other planets.
The Chicxulub crater was formed when a giant asteroid about 10 kilometers (6 miles) wide slammed into what is now Mexico’s Yucatán Peninsula.
The impact triggered a global disaster that led to the extinction of roughly 75% of Earth’s species, including all non-avian dinosaurs.
While conditions on the surface became deadly, a very different environment developed underground.
The tremendous heat from the impact melted rocks deep within the Earth’s crust. At the same time, seawater from the Gulf of Mexico flowed into the fractured rocks. Together, the heat, water, and porous rock created a hydrothermal system similar to those found around hot springs and deep-sea vents today.
Scientists know that wherever warm water flows on Earth, life is often present. Microorganisms can survive and even flourish in these environments.
To investigate how long the Chicxulub hydrothermal system lasted, researchers analyzed rock samples collected during a major drilling project conducted in 2016. The expedition drilled into the crater’s peak ring and recovered minerals that formed when hot fluids circulated through the rocks after the impact.
Using a dating technique known as argon-argon dating, researchers determined that these minerals formed over a period stretching from the time of the impact 66 million years ago to about 58 million years ago. This indicated that hot water continued moving through the crater for around 8 million years.
To understand how the system could remain active for so long, the team used advanced computer simulations. The models incorporated new geological data and more sophisticated calculations than were available in earlier studies.
The simulations showed that a combination of factors likely kept the system alive. Highly fractured rocks allowed water to circulate easily, while heat left behind by the impact and natural geothermal energy from the Earth continued to warm the underground environment for millions of years.
The discovery has important implications beyond Earth. Scientists believe similar impact-generated hydrothermal systems may have formed on planets such as Mars, which has experienced countless asteroid impacts throughout its history.
These underground environments could have provided shelter from radiation and extreme surface conditions while supplying heat and water—two key ingredients for life. Researchers suggest that future space missions may use these findings to identify impact craters that were once most likely to support life.
The study highlights a fascinating possibility: one of Earth’s greatest extinction events may also have created the conditions for new life to flourish beneath the surface for millions of years.
Source: KSR.
