The impact crater of Chicxulub, located on the Yucatán Peninsula in Mexico, is the remnant of a cataclysmic collision that occurred about 66 million years ago. This event marks the end of the Cretaceous and is directly linked to the massive extinction that has disrupted terrestrial and marine biodiversity.
Geological and environmental background prior to impact
Before the impact, the Earth experienced a period of warm and stable climate, characterized by rich biodiversity, dominated by dinosaurs and many marine species. The configuration of the continents favoured diverse ecosystems, while volcanic activity was moderate. However, ecological tensions existed, with changes in sea level and gradual changes in atmospheric composition. These conditions have paved the way for a major ecological crisis.
Global consequences of the fall of the Chicxulub meteorite
The impact released energy equivalent to billions of atomic bombs, projecting huge amounts of dust and aerosols into the atmosphere, causing rapid cooling and a "winter of impact". This disaster resulted in the extinction of about 75% of species, including non-avian dinosaurs. It has also redefined ecological dynamics by promoting the diversification of mammals and the evolution of modern ecosystems. This geological shock is a major pivot in the history of life, highlighting a direct link to the Cretaceous-Paleogen biological crisis, preceded by the fragmentation of the Pangaea supercontinent and followed by the emergence of the first hominids.
Chicxulub's impact is an indelible mark in the evolution of the planet, illustrating how a sudden event can sustainably reshape biodiversity and pave the way for new forms of life and ecological organization.
