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Lead isotope ratios in Spanish coals of different characteristics and origin

AutorDíaz Somoano, Mercedes ; Suárez Ruiz, Isabel ; Alonso, J. I. G.; Ruiz Encinar, J.; López Antón, María Antonia ; Martínez Tarazona, María Rosa
Palabras claveLead
Isotope ratio
Minerals in coal
Trace elements in coal
Fecha de publicación1-jun-2007
CitaciónInternational Journal of Coal Geology 71(1): 28-36 (2007)
ResumenLead isotope ratios in coals of different rank from several Spanish basins were estimated and related with their characteristics. The isotope Pb-206/Pb-207 ratio values of the coals studied range between 1.13 and 1.21, with the exception of some coal samples from the Cretaceous which are more radiogenic. Coals were classified into groups according to their lead isotope ratios. These in turn were related to the isotope ratios of the minerals galena, pyrite, chalcopyrite, and carbonates. Some of the low-rank coals, in which lead might be expected to be associated with the organic matter, were not found to be related with the isotope ratios of minerals. The isotope ratios of the individual densimetric fractions separated from a bituminous coal are different to those of the raw coal. The differences between these isotope ratios may not only be due to the diverse origin of lead in different coals, but also with the possible presence of several lead species incorporated from various sources in a particular coal. The results of this work represent an important contribution to the lead isotope ratio database essential for the accurate interpretation of data regarding pollution sources.
Descripción9 pages, 5 figures, 2 tables.-- Issue title: TSOP 2005 - Papers from the 22nd Annual Meeting of TSOP (Louisville, Kentucky, USA, Sep 11-15, 2005).
Versión del editorhttp://dx.doi.org/10.1016/j.coal.2006.05.006
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