Structural changes in amber due to uranium mineralization
Language English Country Great Britain, England Media print-electronic
Document type Journal Article
PubMed
27085038
DOI
10.1016/j.jenvrad.2016.04.004
PII: S0265-931X(16)30094-7
Knihovny.cz E-resources
- Keywords
- Amber, Fossil resin, Mapping, Micro-FTIR, Radiolytic alteration, SEM/EDX, Uranium,
- MeSH
- Amber chemistry MeSH
- Molecular Structure MeSH
- Gas Chromatography-Mass Spectrometry MeSH
- Uranium analysis chemistry MeSH
- Fossils MeSH
- Publication type
- Journal Article MeSH
- Geographicals
- Czech Republic MeSH
- Names of Substances
- Amber MeSH
- Uranium MeSH
The presence of uranium, with a bulk mass fraction of about 1.5 wt% and radiolytic alterations are a feature of Cenomanian amber from Křižany, at the northeastern edge of the North Bohemian Cretaceous uranium ore district. Pores and microcracks in the amber were filled with a mineral admixture, mainly in the form of Zr-Y-REE enriched uraninite. As a result of radiolytic alterations due to the presence of uranium, structural changes were observed in the Křižany amber in comparison with a reference amber from Nové Strašecí in central Bohemia; this was of similar age and botanical origin but did not contain elevated levels of uranium. Structural changes involved an increase in aromaticity due to dehydroaromatization of aliphatic cyclic hydrocarbons, loss of oxygen functional groups, an increase in the degree of polymerization, crosslinking of CC bonds, formation of a three-dimensional hydrocarbon network in the bulk organic matrix, and carbonization of the organic matrix around the uraninite infill.
Institute of Chemical Technology Prague Technická 5 166 28 Praha 6 Czech Republic
Institute of Rock Structure and Mechanics AS CR 5 Holešovičkách 41 182 09 Praha 8 Czech Republic
Severočeské doly a s Doly Bílina 5 května 213 418 29 Bílina Czech Republic
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