Gold aficionados must thank meteorites for bringing the precious metal to Earth almost 4000000000 years ago.
A new study, precious metals came to Earth when a meteor hit the planet 3900000000 disaster years ago.
Geologist at the University of Bristol believe they have shown that the metals on Earth, including gold and platinum, the result of a meteor 200-million-year giant that took place 650 years after the creation of Earth.
Earth is a ball of magma that first formed about 4500000000 years. As the planet cooled, the solids sink to the center, eventually leading to a core composed mostly of iron.
Some metals such as gold, platinum, nickel, tungsten, and iridium, which is interested in iron, must migrate to the nucleus to leave the outer layer of the Earth are stripped of valuable metals.
However, tens of thousands of times more valuable metals found in the crust of the Earth than it should.
Several theories have been proposed to explain this mystery in the latest sign that the presence of large amounts of precious metals of gold and the other is that a huge meteorite hit the Earth and then the core has formed.
To test this hypothesis, and Professor Matthias Willbold Tim Elliott of the University of Bristol looked at 3800000000 year-old sample of rock from the Isua Greenstone Belt in Greenland. Mantle source rocks which were derived from 4.5 million last year, according Willbold showing its chemical signature precedes the meteor shower.
The ancient rocks of Greenland samples contained a slightly higher than the 182W tungsten isotopes compared to more modern rock. Tungsten-182 occurs only in the first 50 million years of solar system, indicating that the meteor shower has changed the composition of the earth.
Scientists believe the meteorite is stirred the mantle of the Earth by a large flow of liquid material, which leads to the concentration of metals in the deposits of ore mined at present.
“Extracting tungsten from the rock samples and analyze the isotopic composition of the necessary requirements for accuracy so, given the small amount of tungsten available in stone,” said Willbold.
“Our work shows that most of the precious metals in underpinning our economy and many key industrial processes are added to our planet by accident, when Earth was hit by some 20 billion tons of asteroidal material.”
The research is published in the journal Nature.