Reflected-light microscopy of uraniferous bitumens

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Authors:Eakin, P. A.; Gize, A. P.
Author Affiliations:Primary:
Queen's University of Belfast, Department of Geology, Belfast, United Kingdom
Other:
University of Manchester, United Kingdom
Volume Title:Mineralogical Magazine
Source:Mineralogical Magazine, 56(382), p.85-99. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0026-461X
Publication Date:1992
Note:In English. 47 refs.; illus. incl. 3 tables
Summary:Uraniferous bitumens from Great Britain, Scandinavia and South Africa have been studied by oil-immersion reflected-light microscopy and categorized into those formed either by replacement of pre-existing uraninite and pitchblende or by complexation/reduction mechanisms in pre-existing hydrocarbons. Radiolytic alteration of uraniferous bitumens induces both chemical and mechanical alteration. Early alteration generates mobile hydrocarbons during 'cracking reactions' with subsequent within-sample migration to form globular bitumens and dendritic interspersions of mineral-rich and -poor uraniferous bitumen. Mobile hydrocarbons may act as lubricants during mechanical deformation. Advanced organic alteration is characterized by increased reflectance around uraniferous grains, and by fracturing of the bitumens. [R.A.H.]
Subjects:Bitumens; Coffinite; Electron probe data; Fractures; Genesis; Microscope methods; Nesosilicates; Organic compounds; Orthosilicates; Oxides; Petrography; Pitchblende; Reflectance; Silicates; Textures; Uraninite; Zircon group; Organic materials
Abstract Numbers:92M/3153
Record ID:1993008751
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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