Abstract
Abstract Uraninite and other uranium minerals at the Elliot Lake-Blind River uranium ore deposits are held mainly within syngenetic kerogen. Bitumen was generated from kerogen by hydrothermal solutions, through a process similar to hydrous pyrolysis. Liquid bitumen migrated away from its parent kerogen, but transported virtually no U and Th. However, bitumen has a large excess of 206Pb, which indicates that the liquid bitumen must have acted as a sink for mobile intermediate decay products of 238U, probably the noble gas, 222Rn. Bitumen was then convened by heat into a solid, consisting of highly condensed aromatic hydrocarbons, preventing Pb mobility U-Pb isotopic data from individual kerogen grains form an approximately linear array that intersects concordia at 2139 ± 100 Ma and 550 ± 260 Ma. The upper intersection is within error of the 2219 ± 4 Ma Nipissing diabase event, which suggests that this was responsible for almost totally resetting the U-Pb systems in the uraninite. The U-Pb systems show subs...
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