Abstract
Cesium values for rocks from the composite intrusions at Liruei, Amo, Sha Kaleri, and Jarawa are tabulated together with K/Rb ration, which have been shown to be a guide to the stage of evolution of rocks in the individual complexes. The reiation between Cs (which vantes from 0.6 to 9.6 ppm) and K/Rb (which ranges from 25 to 270) was found to be quite haphazard within any complex. If all results are considered together, Cs is usually seen to be low in the earlier-formed rock types (with relatively high K/Rb ration), although some highly fractionated rocks contain just as little Cs while others show quite high values. The independent and erratic behavior of Cs in the Nigerian granites resembles that in some granites from Yugoslavia and New England. (P.C.H.)
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