Science

Ancient rocks reveal when Earth's tectonic engine 'switched on'

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 11/11/2026, 00:25:25 UTC.

Briefings

A 2026 study identifies a 2.5-billion-year-old geological shift where Earth's crust formation mechanisms transitioned to resemble modern plate tectonics, marking a pivotal moment in planetary evolution.

Key points

• The study identifies a major turning point in Earth's geological history occurring approximately 2.5 billion years ago.
• This shift involved the dramatic change in processes shaping the planet's crust that began to resemble the plate tectonics system seen today.

Context

This discovery represents a significant milestone in understanding Earth's early evolution, potentially explaining how the planet's crust formed and stabilized over billions of years.

Limitations

The evidence is limited to a single 2026 study; the specific mechanisms of the crustal shift remain partially unexplained, and the study does not provide further details on the geological processes involved.

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