Geochemical Evidence for Earth’s Thermal Transition at 3.9 Ga: Insights from Jack Hills Zircons
August 5, 2025: A study published in Communications Earth & Environment provides evidence for a transition in Earth’s thermal regime at approximately 3.9 billion years ago (Ga), based on geochemical analysis of zircon grains from the Jack Hills, Western Australia. This shift from exogenic (impact-driven) to endogenic (internally driven) thermal »
