Lithium in younger granites of Northern Nigeria

Details Lithium in younger granites of Northern Nigeria Lithium in younger granites of Northern Nigeria

Jun 1966

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966gecoa..30..555b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 30, Issue 6, pp.555-564

Computer Science

Scientific paper

The distribution of lithium, which has been determined in 48 Nigerian Younger Granites, ranges from less than 5 ppm in an amphibole-granite to a maximum of 630 ppm in albite-riebeckite-granite. The lithium concentration does not exceed 60 ppm for the amphibole-granites, but higher values, greater than 100 ppm, are obtained in the tin-bearing biotite-granites. The Fe 2+ / Li ratio and K / Rb ratio ( et al. , 1962) decrease sympathetically in the later-formed rocks. The distribution of lithium and fluorine, particularly in the riebeckite-granites, shows a statistically "significant" positive correlation. This association suggests that the higher lithium values were probably introduced by late-magmatic and post-magmatic processes. Satisfactory correlation coefficients are also obtained for lithium and rubidium ( r = +0.905) and between lithium and thallium ( r = +0.457). The rare alkali data for the Liruei complex indicates that both lithium and thallium increase in the two trends; amphibole-granites biotite-granites, and amphibole-granites riebeckite-granites ( , 1964).

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