May 14th, 2021, 11:00AM
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Abigail Eisenstadt
Zircons are the oldest minerals in the world and come in colors like the rich blue above. Researchers have now used these gemstones to identify when modern plate tectonics began. (Ken Larsen)
Zircon minerals are the oldest-known Earth material. Some formed even before the planet's crust became the rigid continental plates that move according to modern plate tectonics.
New research on ancient zircons suggests that Earth’s modern plate tectonics likely formed around 3.6 billion years ago. The paper, published in the journal Geochemical Perspective Letters, reveals how one of Earth’s defining geologic features likely formed — and set the stage for the emergence of life.