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Journal of the Geological Society; 1995; v. 152; issue.6; p. 895-898;
DOI: 10.1144/GSL.JGS.1995.152.01.01
© 1995 Geological Society of London

Specials

Low-temperature aqueous mobility of the rare-earth elements during sandstone diagenesis

Jon E. Bouch1, Malcolm J. Hole1, Nigel H. Trewin1 & Andrew C. Morton2

1 Department of Geology and Petroleum Geology, University of Aberdeen, Aberdeen, AB9 2UE, UK
2 British Geological Survey, Nicker Hill, Keyworth, Nottingham, NG12 5GG, UK

Diagenetic francolite (carbonate fluor-apatite) occurs as overgrowths on detrital apatite grains in sandstones from the Lower Jurassic Statfjord Formation of the North Sea. The francolite overgrowths are considerably more enriched in the rare-earth elements (up to 1 wt % Ce2O3), Sr and F than the detrital cores. These elements were carried in aqueous solution, probably in the form of complex ligands involving organically sourced carbon and halogens. It is possible that reported aberrant neodymium isotope model ages within the Statfjord Formation are the result of mobilization and relative fractionation of Sm and Nd during diagenesis, rather than a result of changes in provenance.


Keywords: North Sea, diagenesis, francolite, rare earths, 144Nd/143Nd.




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