A new theory based on a simple but valuable geologic model claims that 80 percent of all commercial gold deposits were formed in a flash.
Gold seams are formed when mineral-rich water flows through networks of cracks in rocks at some 15-30 km deep. But the correct mechanism of deposition of gold is not the one as documented. According to this theory, local earthquakes pull rocks apart brutally, so fast that any fluid thy contain are vapourized, leaving behind the minerals they were carrying.
Richard Henley of the Australian National University in Canberra and Dion weatherely of the University of Queensland in Brisbane have studied earthquake dynamics, and found that quake-triggered pressure changes are much larger than was previously believed; earthquake-triggered pressure are traditionally considered to be a part of the process, but their impact was considered to be quite small. According to Henley however, earthquakes can open cracks in the deep rocks at the speed of sound.
“Large quantities of gold may be deposited in only a few hundred thousand years,” says Weatherley – a brief interval by geological standards. “Each event drops a little more gold,” adds Henley. “You can see it microscopically, tiny layer after tiny layer. It just builds up.
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