Their results are published in Nature.
While the Earth was forming, iron sank to the centre of the planet, forming the core.
Any precious metals in the planetary mix would have gone with this iron and concentrated in the core, leaving the mantle devoid of elements such as gold, platinum, and osmium.
But this is not what we observe. In fact, the silicate mantle has up to 1,000 times more gold than anticipated.
Several reasons for this enrichment were proposed in the past, including delivery by meteorites, although until now it has not been possible to prove.
By measuring isotopes in rocks that are nearly four billion years old from Greenland, the team has managed to date the gold delivery, and to relate it to an event known as the "terminal bombardment".
The story also goes on to say that the scientists have used a totally different mineral to preform their experiments and reach their conclusions that mineral in Tungsten.
"The proportions of gold and other precious metals are difficult to measure because they concentrate into nuggets, and we need to analyse a lot of rocks to get meaningful data." said lead researcher Dr Matthias Willbold.
They have therefore developed a way of telling this remarkable story of gold's extraterrestrial origin using a completely different element - Tungsten.
The study is very interesting I wonder if it would be worth while do a little prospecting at Tungsten occurrences and perhaps do a few assays for gold in those samples?
The whole story about gold and other minerals being "deposited" in younger rocks of the earth as the result of being impacted with 20 billion billion tonnes of asteroid material, is certainly interesting and intriguing.
May dust off some data on local Tungsten deposits. After all, information is the prospectors best friend!
Happy Prospecting!
Newfoundland Gold Specimen
Sample from a Tungsten and Molybdenum Showing
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Clark Miners
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