Hydrothermal alteration of organic matter in uranium ores, Elliot Lake, Canada - Implications for selected organic-rich deposits

Details Hydrothermal alteration of organic matter in uranium ores, Elliot Lake, Canada - Implications for selected organic-rich deposits Hydrothermal alteration of organic matter in uranium ores, Elliot Lake, Canada - Implications for selected organic-rich deposits

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.3251m&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 14, p. 3251-3259.

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Geochemistry, Mineral Deposits, Organic Compounds, Physical Properties, Uranium Compounds, Bitumens, Kerogen, Trace Elements

Scientific paper

Attention is given to organic matter in the uraniferous Matinenda Formation, Elliot Lake, Canada, which is preserved in the forms of syngenetic kerogen and solid bitumen. U-Pb systematics of 2.45-Ga old kerogen from this site were reset at 2139 +/- 100 Ma, coincident probably with the emplacement of the Nipissing diabase. Generation and migration of bitumens, liquified from kerogen by hydrous pyrolysis, occurred during the Nipissing thermal event. The extent of carbon isotopic fractionation between two types of organic matter is generally compatible with the derivation of bitumen from kerogen. Anomalously high amounts of Pb-206 present in Elliot Lake bitumen suggests that organic matter was a sink for the intermediate, probably volatile decay products of the U-238 chain derived during the hydrothermal alteration of the kerogen. Anomalously low amounts of uranium and thorium present in the Elliot Lake bitumen show that bitumen migration did not mobilize uranium, thorium, and uraninite from the kerogen.

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