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Largest gold deposit in the world have created by bacteria - VIDEO PDF Print E-mail
Wednesday, 04 February 2015 09:15

In the formation of the largest gold deposits in the world have played a key role microbes. The deposits of the precious metal on the planet could arise only in a short period of time: between the appearance of life and the saturation of the atmosphere with oxygen. Thus, at present time, new gold deposits are formed.

After the discovery of Vitvatesrand (South Africa) in 1886, there have extracted about 40 thoUSAnd metric tons of gold - almost half of all stocks of gold ever produced by man. Field itself arose three billion years ago - and the mechanisms of its occurrence have long debated by geologists.

There is no doubt that the Earth's surface metal hit by erosion auriferous veins in granitic rocks Kaapvalskogo craton. It is unclear just how tons of gold have come to a few hundred kilometers to the south.

According to Christoph Heinrich (Christoph Heinrich) at the Swiss Federal Institute of Technology, played a role here is not just the mechanical processes pieces of metal leaching from rocks rivers. Gold "chosen" from the river water microbial mats in shallow waters of the Witwatersrand, said the scientist.



Three billion years ago, the planet's atmosphere had almost no oxygen (the gas after 500 million years started to produce algae and cyanobacteria). The air was saturated with sulfur gases (such as hydrogen sulfide) that are released into the atmosphere volcanoes. These gases are returned to the surface in the form of acid rain. Gold also form, with the soluble sulfur compounds are dissolved in water: a metal selected from the same germs.

If in the atmosphere contain more oxygen, he would have reacted with sulfur and gold and would have destroyed them even before they got to the shallow reservoirs with microbial mats.

"And now - the billion dollar question: whether the remaining deposits were formed as a result of the same process?" - Says Heinrich. If the answer is affirmative (ie, gold moves not in the deposits of gold-bearing sand), explorers will be advised to seek no metal-rich sand and traces of Precambrian life, especially saturated carbon shale.


НАЖМИТЕ ЗДЕСЬ ДЛЯ ПРОСМОТРА ВСЕГО СПИСКА НОВОСТЕЙ О НЕОБЫЧНЫХ ЯВЛЕНИЯХ>>>

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