An Earth’s Ancient Rock on the Moon

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A 2-cm chip integrated into the bigger rock of Apollo astronauts, as researchers say, is indeed a four-billion year old piece of our own planet, and what the oldest known rock of the Earth has transformed into a unique location: The Moon. “The finding paints an earlier image and the bombardment that changed our planet in the dawn of life”, says David Kring, a lunar geologist with a research released in Earth and Planetary science Letters on 24 January 2019, at the Lunar and Planetary Institute in Houston, Texas.

The large Apollo 14 sample called “Big Bertha” holds a 2-centimetre chip thought to be from Earth. Source: www.space.com

A group led by Kring has found fragments of asteroids in comparable moon rocks several years earlier. It was, therefore, logical to look for parts of the Earth. A granite blend of quartz, feldspar and zirconium crystals given clues to its origins to the trace elements in the rocks of minerals. The team recorded the development of the rock by evaluating uranium and its decay products in zircons and the temperature and pressure at that moment were shown by the titanium concentrations. Still more trace elements, such as cerium, indicate the presence of water.

The findings show that the rock created at altitudes and stresses of 19 kilometres below the Earth’s ground, or about 170 kilometres high in the Moon in a watery setting. Rock is not the earliest relic on earth: Western Australian zircon crystal (hablur) has been estimated to 4.4 billion years ago only 150 million years after the creation of the earth. These zirconia have, however, been removed and transformed into fresh material from their mother stones. Here, says Kring, the rock and its zircons have no doubt been created simultaneously. “We’re certain it’s a rock,” he said. The stone is about as ancient as the earth’s most ancient rocks— metamorphic Canadian and Greenland stones.

Bell claims it is not so unexpected because there is no moon with the climate and geological procedures that remove old stones on Earth. She suggests, actually, the moon may be stronger than the earth itself in search of the old Earth stones. Norm Sleep, a Stanford University geophysicist in Palo Alto, California is in favour of it. He said that although earth meteorites may be a small part of moon’s ground content, they have been churned throughout the lunar soil by aeons of subsequent asteroid impacts, which makes it easily finding a small bit of Earth in a random moon sample.

If the rock is really terrestrial, there are clues to an ancient moment called the Hadean. To begin with, it proves that asteroids have struck the earth large enough to burst boulders (batuan tongkol) throughout the moon. It also indicates that there were already granite stones forming on Earth, Kring claims. Kring thinks that other researchers will quickly comb the Apollo Moon Rocks for old earth pieces. “It’s a big thing. Only a tiny percentage of the moonwalker’s 382 kilograms of stones were researched and analytical methods are constantly improved. I believe in the next few years that we will have a small library of fragments from the Earth”, he says

References:
1. https://www.sciencemag.org/news/2019/01/ancient-earth-rock-found-moon
2. https://www.space.com/43118-earth-oldest-rock-moon-apollo-14.html

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