Geologists propose that asteroid bombardments sustained high temperatures in Earth’s early crust, facilitating the formation of continents. This theory challenges existing notions of plate tectonics versus mantle plume activity during the Hadean eon, where evidence remains scarce.
Tim Johnson and colleagues suggest the formation of Earth's continents was significantly influenced by a barrage of asteroid impacts. These impacts potentially maintained the early crust's temperature, making it thin enough to allow for the rise of buoyant continental masses.
The existing geological record is limited, with the oldest continental rocks dating to around 4.03 billion years ago. This scarcity complicates the understanding of Earth's formative processes, leading to various theories about how the continents developed.
Traditionally, one theory supports a plate tectonics model operating during the Hadean eon, with crust forming in subduction zones. Conversely, another theory suggests that extreme heat during early Earth hindered plate rigidity, leading to crust formation via mantle plumes.
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Geologists propose that asteroid bombardments sustained high temperatures in Earth’s early crust, facilitating the formation of continents. This theory challenges existing notions of plate tectonics versus mantle plume activity during the Hadean eon, where evidence remains scarce.