Organic geochemical analysis of sedimentary organic matter associated with uranium

The alteration of organic matter in response to ionising irradiation: Chemical trends and implications for extraterrestrial sample analysis

“…U, gave an H/C ratio of 0.520, significantly less than the values of $0.8, as observed for the nonirradiated samples. This supports previous work by Pierce et al (1958) and explains the general hydrogen-depletion of uraniferous organic matter (e.g., Leventhal et al, 1986). A similar effect has been observed during the experimental irradiation of organic matter (Colombo et al, 1964).…”

Comparison of organic geochemistry and metal enrichment in two black shales: Cambrian Alum Shale of Sweden and Devonian Chattanooga Shale of United States

“…However, SiO 2 was measured by X-ray fluorescence (Taggart et al 1987) and uranium by delayed neutron analysis (McKown and Millard 1987). Organic geochemical methods are described in Leventhal et al (1986). Rock-Eval pyrolysis was performed on all samples (Tissot and Welte 1978) using a Delsi model II with an organic carbon analyzer.…”

Occurrences and distributions of branched alkylbenzenes in the Dongsheng sedimentary uranium ore deposits, China

“…But an indirect role cannot be excluded, because organic matter alteration can create and maintain a reducing environment favorable for preconcentration of U and subsequent precipitation of uranium minerals (Min et al, 2000). In some cases, radiation damage has been shown to increase the aromatic carbon content and lower the amount of hydrocarbon pyrolysis products from the insoluble organic matter associated with U minerals (Leventhal and Daws, 1986). It should be noted that the organic matter in the U host sandstone, which is a mixture of mainly aquatic and minor terrigenous detritus, have a relatively low HI index and falls in the Type III organic matter region on the HI vs. Tmax diagram (Tuo et al, 2007).…”