Barren, flat and almost entirely under water: What Earth was like 4.4 billion years ago
- Only a few small islands penetrated the global ocean
- Researchers studied which the oldest fragments of the Earth ever found
- Zircon mineral grains that were preserved in sandstone rocks in the Jack Hills of Western Australia
Earth was barren, flat and almost entirely under water just 4.4 billion years ago, a new study has found.
Researchers say only a few small islands penetrated the global ocean engulfing our planet.
They says conditions on earth were 'quiet and dull'
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Zircon crystals as old as 4.4 billion years were found in sandstone at Jack Hills of Western Australia, from a time when Earth was barren, flat and almost entirely under water
'The history of the Earth is like a book with its first chapter ripped out with no surviving rocks from the very early period, but we've used these trace elements of zircon to build a profile of the world at that time,' said Dr Burnham from the ANU Research School of Earth Sciences, who led the study.
'Our research indicates there were no mountains and continental collisions during Earth's first 700 million years or more of existence - it was a much more quiet and dull place.
The team studied zircon mineral grains that were preserved in sandstone rocks in the Jack Hills of Western Australia and which were the oldest fragments of the Earth ever found.
'Our findings also showed that there are strong similarities with zircon from the types of rocks that predominated for the following 1.5 billion years, suggesting that it took the Earth a long time to evolve into the planet that we know today.'
Dr Burnham said the zircon grains that eroded out of the oldest rocks were like skin cells found at a crime scene.
'We used the granites of southeast Australia to decipher the link between zircon composition and magma type, and built a picture of what those missing rocks were,' he said.
Dr Burnham said the zircon formed by melting older igneous rocks rather than sediments.
The first known form of life emerged some time later, around 3.8 billion years ago.
Dr Burnham said the zircon formed by melting older igneous rocks rather than sediments.
'Sediment melting is characteristic of major continental collisions, such as the Himalayas, so it appears that such events did not occur during these early stages of Earth's history,' he said.
Dr Burnham said scientists in the field were able to build on each other's work to gain a better understanding of early Earth.
'The samples of zircon from Jack Hills have been collected over the course of several decades by many people, while chemical analyses carried out by an ANU research group 20 years ago have proved invaluable,' he said.
The study, 'Formation of Hadean granites by melting of igneous crust', is published in Nature Geoscience.
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