Abstract
A total of 65 radiochemical uranium and thorium analyses of igneous rocks from the Hercynian Kylcha and Kuu granitic intrusions of Central Kazakhstan is presented. Data on leaching studies and on the uranium contents of mineral separates of Kylcha rocks are given. For comparative purposes, 14 uranium and thorium analyses of Zhirov's for Hercynian Shet granitic rocks are included. Petrographical data include general descriptions of the rocks, modal analyses, and six whole rock chemical analyses. Geologically the Kylcha biotite- and biotite-hornblende granites are determined to be early Hercynian in age whereas the leucogranites of Kuu and Shet intrusions are late Hercynian. Average thorium and uranium contents, and Th/U ratios for the three intrusions are respectively: 31 ppm, 4.2 ppm, and 7.4 for Kylcha granites; 42 ppm, 11 ppm, and 3.8 for Kuu granites; and 46 ppm, 10 ppm, and 4.6 for Shet granites. The uranium and thorium data are treated statistically by the authors and they conclude that there is a real difference between the distributions of radioactive elements in these early and late Hercynian granitic intrusions.--Z. Peterman.
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