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The discovery of a 4 billion-year-old piece of the Earth's crust

Science

The discovery of a 4 billion-year-old piece of the Earth's crust


By TechThop Team

Posted on: 23 Aug, 2022

The South-West of Western Australia has been found to have an ancient piece of the Earth's crust discovered by researchers at Curtin University.

The piece is estimated to be almost four billion years old. In a study published by Scitechdaily, scientists used lasers smaller than a human hair to target microscopic grains of a mineral extracted from beach sand.

Maximilian Droellner, who leads Curtin's Timescales Mineral Systems Group, explained that the lasers were used to vaporise individual zircon grains to determine how they originated.

It has been estimated that an ancient crust about the size of Ireland has been playing a role in the geological evolution of WA for billions of years, according to Droellner.

According to him, these particles play a crucial role in the formation of rocks across that time in WA.

The part of the crust under the South-West corner of WA has survived multiple mountain-building events between Australia, India, and Antarctica.

The timing of early crust formation and preservation around the world is similar to that observed in Australia, India, and Antarctica, among other regions around the globe.

A significant change in the evolution of the Earth occurred about four billion years ago, when meteorite bombardment reduced, crust stabilized, and life evolved.

Dr. Milo Barham, the supervisor, explained that this ancient piece of crust defines a crustal boundary that controls where economically important minerals are found.

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