When did plate tectonics begin? Scientists find new clues

Key Points:

• Scientists have discovered the earliest direct evidence of plate tectonics on Earth, dating back to about 3.5 billion years ago during the Archean Eon, pushing back the timeline for when tectonic plates began shifting.
• The research, led by Harvard's Roger Fu, analyzed paleomagnetic data from rock samples in Western Australia's Pilbara region and South Africa's Barberton Greenstone Belt, revealing significant latitudinal drift and rotation indicative of moving tectonic plates.
• Findings demonstrate that Earth's lithosphere was segmented into distinct, movable plates rather than a single unbroken shell, providing crucial insight into the planet's early geological activity and conditions that supported early microbial life.
• This study offers a substantial amount of high-quality paleomagnetic data from ancient rocks, addressing longstanding scientific debates about the onset and nature of plate tectonics on early Earth.
• Understanding when plate tectonics began helps explain the formation of mountains, oceans, and Earth's climate, which are fundamental to the emergence and sustenance of life on our planet.