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... The deposit of Shungite in Karelia was formed about 2 billion years ago and extends over 9,000 sq km ( 3,475 sq miles). The deposit has been estimated to contain more than 250 gigatonnes of carbon reserves. The deposit is found within a sequence of Palaeoproterozoic metasedimentary and metavolcanic rocks - the main accumulations are concentrated in 9 layers, ranging in thickness from 5 meters (16 ft) to 120 meters (400 ft) . The sequence is dated by a gabbro intrusion, which gives a date of 1980±27 Ma, and the underlying dolomites, which give an age of 2090±70 Ma 9 and demonstrates a significant difference between shungite & petroleum/coal (200-250 Ma). ...
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