Fingerprint vanished 2.5 billion years ago marks turning point in Earth’s geological history

Around 2.5 billion years ago, something fundamental changed in how Earth built its crust, and researchers at Curtin University say they have found the chemical evidence for it: a fingerprint that shows up in ancient rocks around the world and then disappears.

The finding gives the clearest geological timing yet for when the processes shaping Earth’s surface began to resemble the plate tectonics seen today, the authors say.

A hard question to answer

Plate tectonics shapes the continents and oceans and, over deep time, helps regulate Earth’s climate and magnetic field. But scientists have struggled to say when it began, because the process destroys much of its own evidence by recycling crust deep inside the planet. The start date is still debated, and other studies of ancient mineral crystals have proposed earlier beginnings for some form of tectonic motion.

Hunting a chemical fingerprint

The team looked for a signature left behind when new crust forms by melting older rock. They searched for it in thousands of rocks from around the world, spanning almost four billion years of Earth’s history, said lead author Janne Liebmann, a research fellow at Curtin’s Timescales of Mineral Systems Group.

“We found it consistently in rocks older than 2.5 billion years,” she said, showing they came from a pool of ancient crust that formed about four billion years ago.

After 2.5 billion years ago, the fingerprint vanishes. “Despite examining thousands of rocks, we never see it again,” Liebmann said. That, she said, points to a basic change in how Earth’s crust was formed and transformed, toward the dynamic system seen today.

From reworking in place to recycling on a grand scale

Co-author Chris Kirkland, a professor in Curtin’s School of Earth and Planetary Sciences, described the shift as a move from an early Earth, where ancient crust could be melted and reworked over and over in place, to one able to move and recycle crust on a much larger scale. Seeing the old fingerprint disappear at such a specific time, he said, is what makes the result remarkable.

What sets Earth apart

The result also helps explain when Earth gained a feature that distinguishes it from tectonically inactive planets such as Venus and Mars. Plate tectonics, Kirkland said, is fundamental to how Earth has evolved, constantly reshaping continents and oceans and influencing the atmosphere and climate.

He called the finding the clearest geological evidence yet for when the “tectonic engine” of the modern Earth “switched on.”

The release doesn’t say which chemical signature the team used or how many rocks were in the final dataset, beyond “thousands.” Liebmann said the fingerprint offers a rare glimpse into how Earth’s earliest crust evolved.

The paper, “Loss of ancient crustal reservoirs marks a shift in Earth’s geodynamic regime,” was published in Proceedings of the Royal Society A.