A long-lived impact-generated hydrothermal system at the Chicxulub impact structure

Hydrothermal systems likely played an essential role in the origin of life, both on Earth and potentially on other planets. They form anywhere that heat and aqueous fluids interact, including within cooling hypervelocity impact craters. Longer periods of hydrothermal activity will generate extended windows of opportunity for prebiotic chemical reactions to occur, life to develop, and micro-organisms to thrive and propagate beyond their point of origin. Here, we present radioisotopic age constraints and numerical simulations for the duration of post-impact hydrothermal activity in and around the peak ring of the ~200 km diameter 66 Ma Chicxulub impact structure. We find that hydrothermal activity persisted for at least 8 million years (Myr), which is approximately four times longer than previously estimated by numerical simulations, palaeomagnetic records, and petrographic interpretations at Chicxulub, making it the longest-lived impact generated hydrothermal system documented on Earth.