Abstract
Alkaline lavas from southwestern Poland have been analysed for major and trace elements and Sr and Nd isotope composition. K-Ar age determinations indicate that the olivine nephelinites, basanites, hawaiites and trachytes were erupted during three episodes at about 30 Ma. A depleted mantle source is inferred for the mafic lavas from their 87Sr/86Sr (0.70342–0.70376) and 143Nd/144Nd (0.51278–0.51288) ratios, while the trachytes give higher 87Sr/86Sr ratios (0.7045) explained by some crustal assimilation. Chemical and isotopic differences between nephelinites and basanites suggest that each rock type was derived from a distinct mantle source.
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