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Oldest Known Rocks Evolved on Earth Are Result of Asteroids, Research Reveals

Meaning these rocks were rare survivors from a very different time on Earth

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Earth's oldest known evolved rocks result of asteroids. Pixabay

The oldest evolved rocks on Earth are the consequence of asteroids colliding with the the planet 4 billion years ago, an Australian research released on Tuesday revealed.

The study by the Curtin University suggests that the rocks, part of the Acasta Gneiss Complex in northwest Canada, are the result of asteroids smashing into the Earth and melting its crust, allowing evolved, or granitic, rocks to form, reports Xinhua news agency.

What led scientists to suggest that they were formed in this way was firstly, the composition of the rocks is different from the those typical of the Earth’s ancient crust.

“The only known evolved rocks from the Hadean eon are those in northwest Canada, which have chemical compositions clearly distinct from those that dominate ancient continental crust worldwide, suggesting they were formed in a different way,” research co-author professor Phil Bland said.

asteroids
Meaning these rocks were rare survivors from a very different time on Earth. Pixabay

Secondly, the rocks were melted at very low pressures, equivalent to the uppermost few kilometres of crust, meaning the event happened closer to the Earth’s surface.

“The melting of these rocks at such shallow levels is most easily explained by meteorite impacts, which would have supplied the energy to attain the extreme temperatures required for melting,” lead researcher Tim Johnson said.

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This period, around 4 billion years ago, was dominated by a barrage of asteroid impacts that would have caused widespread melting and recycling of the Earth’s surface.

“Consequently, there are almost no rocks preserved from Earth’s formative Hadean eon,” Bland said.

Meaning these rocks were rare survivors from a very different time on Earth. (IANS)

Next Story

NASA’s Future Scientists Would Likely Be Better Equipped To Study The Lunar Material

"By studying these precious lunar samples for the first time, a new generation of scientists will help advance our understanding of our lunar neighbor and prepare for the next era of exploration of the moon and beyond."

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NASA
Astronaut Harrison H. Schmitt collects lunar rake samples during the Apollo 17 mission, Dec. 13, 1972. VOA

NASA is once again turning its focus to the moon.

Nearly 50 years after the last lunar mission, the U.S. space agency is unsealing some of the samples brought back by Apollo astronauts for study.

The lunar samples were collected by astronauts during the Apollo 15, 16 and 17 missions.

Some of the samples have never been opened, others were resealed in an effort to preserve them.

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“This exploration will bring with it new and unique samples into the best labs right here on Earth.” Pixabay

NASA has picked nine teams of scientists to study the samples. The teams were selected from scientists at the NASA Ames Research Center, the Bay Area Environmental Research Institute, NASA’s Goddard Spaceflight Center, the University of Arizona, the University of California, Berkeley, the U.S. Naval Research Laboratory, the University of New Mexico, Mount Holyoke College and the Planetary Science Institute.

NASA
The lunar samples were collected by astronauts during the Apollo 15, 16 and 17 missions. Pixabay

“By studying these precious lunar samples for the first time, a new generation of scientists will help advance our understanding of our lunar neighbor and prepare for the next era of exploration of the moon and beyond,” said Thomas Zurbuchen, associate administrator for NASA’s Science Mission Directorate. “This exploration will bring with it new and unique samples into the best labs right here on Earth.”

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NASA said its officials in the 1970s had the foresight to know that future scientists would likely be better equipped to study the lunar material. (VOA)