Physics
Scientific paper
Oct 1966
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966gecoa..30..985b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 30, Issue 10, pp.985-993
Physics
8
Scientific paper
The zirconium content of 48 Nigerian Younger Granites has been determined by X-ray fluorescence spectrography. Values range from 110-420 ppm in the biotite-granites to a maximum of 2200 ppm in albite-riebeckite-granite. In the amphibole-granites (220-1500 ppm) high values are usually associated with rocks containing arfvedsonite, while lower values may be correlated with the presence of ferrohastingsite. The zirconium distribution is partly reflected by the relative abundance of zircons in the amphibole-granites and their paucity in the biotite-granites. In contrast, the riebeckite-granites contain high zirconium values but zircons are relatively rare. The distribution of zirconium is dependent on the alkalinity of the various melts from which the rock phases crystallized. The changing alkalinity conditions are interpreted from the variation in the agpaitic coefficient (expressed as the atomic ratio [ Na + K ]/ Al ) and the mineralogy. Decreasing agpaitic coefficient values are paralleled by a similar reduction of the zirconium concentration in the amphibole-granites biotite-granites trend, while higher agpaitic coefficients and zirconium contents are associated with the amphibole-granites riebeckite-granites trend.
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