Geologists on the California Institute of Expertise have discovered proof that enormous clumps of fabric close to the Earth’s core, believed to have been fashioned by Earth’s cosmic collision with the dwarf planet Theia 4.5 billion years in the past, could also be accountable for the formation of recent tectonic plates. Analysis outcomes revealed within the journal Geophysical Analysis Letters.
The scientists analyzed current information on the clumps, often known as giant low shear velocity areas (LLVPs), and used them to create laptop fashions exhibiting their influence on Earth over very long time scales.
Knowledge for the fashions was derived from seismic information exhibiting that LLVPs are composed of fabric that’s completely different from that of the core or mantle.
About 200 million years after Theia impacted Earth, LLVP strain produced scorching plumes extending from the core to the floor. This has contributed to the subsidence of some areas of the floor and subduction, the place elements of the Earth’s crust sink into the mantle and soften. Subduction ultimately created faults on the floor that function tectonic plate boundaries in the present day.
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2024-05-15 00:13:34