Bitumens in Uranium Deposits

Landais, P.

doi:10.1007/978-3-642-85806-2_13

Cited by 10 publications

(6 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Identification of the source rock for the migrating hydrocarbons and dating the emplacement of the fluid inclusions are factors to establish with confidence. Moreover, the enclosing minerals still need to be protected from the destructive effects of thermal metamorphism (Price, 1993) and ionizing radiation (Dahl et al, 1988;Landais, 1993;Lewan and Buchardt, 1989;Rasmussen et al, 1993). For example, in the case of the inclusions reported from the 2.45 Ga metaconglomerate of the Matinenda Formation, the authors state that these hydrocarbons were "exposed to upper prehnite-pumpellyite facies metamorphism (280-350 °C) either during migration or after entrapment" (George et al, 2008).…”

mentioning

confidence: 99%

Paleoproterozoic sterol biosynthesis and the rise of oxygen

Gold

Caron

Fournier

et al. 2017

Nature

108

View full text Add to dashboard Cite

The Record of Precambrian Steroidal HydrocarbonsThe record of sterane and triterpane hydrocarbon biomarkers in Archean and Proterozoic sedimentary rocks has come under extremely thorough scrutiny in recent times. Concerns about contamination, and doubts about reports of steroidal hydrocarbons in the 2.7 billion year-old Fortescue Group sediments of the Pilbara Craton (Brocks et al., 1999), were initially raised in 2003(Brocks et al., 2003. These potential problems became increasingly difficult to dismiss when new and improved types of geochemical analyses were devised and applied. For example, Brocks and colleagues showed that a selection of rock and sediment samples from a range of localities were ubiquitously contaminated with petroleum-and plastic-derived organic compounds . Analyses of thin slices of sediment core showed that spatial distributions of hydrocarbons could be used to distinguish indigenous hydrocarbons from surface contaminants in Archean shales (Brocks, 2011). In another example, the carbon isotopic data values of in situ and insoluble kerogen and pyrobitumen in rock formations that had previously yielded biomarkers were discrepant from those of the extractable hydrocarbons, meaning that the latter could not be indigenous (Rasmussen et al., 2008).

show abstract

mentioning

confidence: 99%

Paleoproterozoic sterol biosynthesis and the rise of oxygen

Gold

Caron

Fournier

et al. 2017

Nature

108

View full text Add to dashboard Cite

show abstract

“…The bitumen yield decreases and is 13 C enriched (Dahl et al, 1988;Landais, 1993;Leventhal and Threkeld, 1978). Molecular composition of bitumen also changes with a decrease in saturated hydrocarbons, whereas aromatic and polar hydrocarbons as well as asphaltenes increase (Zumberge et al, 1978;Forbes et al, 1988;Kříbek et al, 1999;Court et al, 2006).…”

Section: Radiolysismentioning

confidence: 99%

“…Molecular composition of bitumen also changes with a decrease in saturated hydrocarbons, whereas aromatic and polar hydrocarbons as well as asphaltenes increase (Zumberge et al, 1978;Forbes et al, 1988;Kříbek et al, 1999;Court et al, 2006). In addition, aromaticity increases with uranium content, for example at Cluff Lake (Landais, 1993), as aromatic hydrocarbons are more stable than aliphatic hydrocarbons in the presence of ionising radiation (Bovey, 1958).…”

Section: Radiolysismentioning

confidence: 99%

Radiolytic alteration of biopolymers in the Mulga Rock (Australia) uranium deposit

Jaraula

Schwark

Moreau

et al. 2015

Applied Geochemistry

View full text Add to dashboard Cite

“…The threat of environmental pollution from the release and dispersal of uranium and related radionuclides into the biosphere has stimulated extensive research focusing on the geochemical properties of radionuclides and the interaction of U minerals and dissolved species with biological systems. The strong tendency of U to form stable aqueous complexes and precipitates with organic ligands and compounds is well known (e.g., Nash et al 1981;Turner et al 1993;Landais 1993;Read et al 1993;Jamet et al 1993) and indicates that U-biotic interactions could play an important role in radionuclide cycling at the Earth's surface. This hypothesis is supported by recent work elucidating the profound influence exerted by microbial communities on element cycling in the biosphere.…”

Section: Introductionmentioning

confidence: 99%

Bioaccumulation of metals by lichens; uptake of aqueous uranium by Peltigera membranancea as a function of time and pH

Haas

Bailey

Purvis

1998

American Mineralogist

View full text Add to dashboard Cite

Uranium sorption experiments were carried out at ϳ25 ЊC using natural samples of the lichen Peltigera membranacea. Thalli were incubated in solutions containing 100 ppm U for up to 24 h at pH values from 2 to 10. Equilibrium sorption was not observed at less than ϳ6 h under any pH condition. U sorption was strongest in the pH range 4-5, with maximum sorption occurring at a pH of 4.5 and an incubation time of 24 h. Maximum U uptake by P. membranacea averaged ϳ42 000 ppm, or ϳ4.2 wt% U. This appears to represent the highest concentration of biosorbed U, relative to solution U activity, of any lichen reported to date. Investigation of post-experimental lichen tissues using electron probe microanalysis (EPM) reveals that U uptake is spatially heterogeneous within the lichen body, and that U attains very high local concentrations on scattered areas of the upper cortex. Energy dispersive spectroscopic (EDS) analysis reveals that strong U uptake correlates with P signal intensity, suggesting involvement of biomass-derived phosphate ligands or surface functional groups in the uptake process.

show abstract

Bitumens in Uranium Deposits

Cited by 10 publications

References 21 publications

Paleoproterozoic sterol biosynthesis and the rise of oxygen

Paleoproterozoic sterol biosynthesis and the rise of oxygen

Radiolytic alteration of biopolymers in the Mulga Rock (Australia) uranium deposit

Bioaccumulation of metals by lichens; uptake of aqueous uranium by Peltigera membranancea as a function of time and pH

Contact Info

Product

Resources

About