Due to the continuous movement of tectonic plates on Earth's crust, earthquakes frequently occur on our planet. The forces of plate tectonics largely determine everything from climate to the evolution of life.
While plate tectonics are of paramount importance, their exact initiation remains a mystery. Since the beginning of the 21st century, geologists have been gathering data in an attempt to unravel the timing and mechanisms of plate tectonics. These studies have yielded many results that often contradict each other.
However, over the past decade, scientists have gradually reached a consensus. Around 3 billion years ago, a crucial shift in crustal tectonics occurred: numerous pieces of evidence indicate a profound change in tectonic activity at that time. For instance, a study in 2016 found that the composition of the crust began to change around 3 billion years ago.
Other research suggests that the transformation of the crust may have occurred even earlier. Some studies indicate that subduction processes may have existed on Earth as early as 3 or even 3.8 billion years ago. However, there is considerable debate within the scientific community regarding the extent of this early subduction.
Some studies suggest that certain subduction processes may have been triggered by meteorite impacts, as simulated by collision models. Research on the ancient continental crust during the Archean Eon in 2022 concluded that subduction was only local at least 2.7 billion years ago.
In contrast, true plate tectonics are thought to be global and ongoing. Researchers point to compelling evidence emerging around 2.2 billion years ago. At that time, an ancient supercontinent known as Nuna or Columbia was forming, reflecting a global-scale process.
Despite this, the system continued to evolve. Rocks like blueschist, which form and sink into the mantle only under the high density and low-temperature conditions of subduction zones, appear in the rock record from about 800 million years ago. Some researchers argue that it was only around this time that modern plate tectonics truly began on Earth.
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