Chicxulub Impact Sustained Hydrothermal Vents for 8 Million Years, Far Beyond 2-Million-Year Estimates
Updated
Updated · Scientific American · Jun 9
Chicxulub Impact Sustained Hydrothermal Vents for 8 Million Years, Far Beyond 2-Million-Year Estimates
3 articles · Updated · Scientific American · Jun 9
Summary
Argon isotope tests on Chicxulub crater rocks indicate hydrothermal activity persisted from about 66 million to 58 million years ago after the dinosaur-killing asteroid strike.
Four samples came from the crater’s peak ring, drilled in 2016 at depths of 706 to 756 meters below the seafloor off Mexico’s Yucatan Peninsula.
The finding sharply extends earlier model-based estimates that vents at the impact site lasted only about 2 million years, though researchers say it is unclear how widespread the long-lived activity was.
Porous, fractured impact rocks may have created protected microenvironments for microbes, making the result relevant to studies of how life could persist after major impacts.
The team said similar crater-driven hydrothermal systems may have existed on Mars, offering clues for future missions seeking past habitable environments.
Could ancient craters on Mars hold the fossilized remains of similar life-sustaining hot springs?
Did the asteroid that killed the dinosaurs also create an eight-million-year cradle for new life?
Were cosmic collisions, not primordial soups, the true crucibles for life's origin on early Earth?
8 Million Years of Hydrothermal Activity: Chicxulub Crater’s Surprising Role in Life’s Recovery and Astrobiology
Overview
The Chicxulub crater, formed by the asteroid impact that wiped out the dinosaurs 66 million years ago, hosted a vast hydrothermal system that lasted for 8 million years. The immense energy from the impact melted thousands of cubic kilometers of rock, and when this superheated rock met seawater, it created a porous environment filled with hot water. This led to the formation of an extensive hydrothermal system beneath the crater, which provided a unique and long-lasting habitat for microbial life, showing how catastrophic events can create new opportunities for life to thrive.