K/Rb ratios in the evolution of the Younger Granites of Northern Nigeria

Details K/Rb ratios in the evolution of the Younger Granites of Northern Nigeria K/Rb ratios in the evolution of the Younger Granites of Northern Nigeria

Jan 1962

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962gecoa..26...89b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 26, Issue 1, pp.89-100

Computer Science

6

Scientific paper

K/Rb ratios have been determined in about 70 granites from Northern Nigeria. It is shown that late stage rocks such as albite-riebeckite-granites have ratios below 30 while early-stage rocks such as Ca-amphibole-granites can have ratios up to 330; biotite-granites have intermediate ratios. In the Liruei complex the ratio decreases progressively with time of emplacement but in the Amo complex the ratio varies irregularly.

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