Sunday, February 21, 2010
Diamonds form between 120-200 kms or 75-120 miles deep in the earth's surface. According to geologists the first delivery of diamonds was somewhere around 2.5 billion years ago and the latest was 45 million years ago. According to science, the carbon that makes diamonds comes from the melting of pre-existing rocks in the Earth's upper surface mantle. There is an abundant quantity of carbon atoms in the mantle.
Temperature changes in the upper mantle forces the carbon atoms to go deeper and it melts and finally becomes new rock, when the temperature reduces. If other conditions like pressure and chemistry works right then the carbon atoms in the melting crustal rock bond to build diamond crystals. Yet there is no guarantee that these carbon atoms will surely turn into diamonds. Either if the temperature rises or the pressure drops then the diamond crystals may melt partially or totally dissolve. Even if they do form, it would take thousands of years for those diamonds to come anywhere near the surface.Labels: Formation of Diamonds
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