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| Abstract |
Number of alpha-particles emitted from each minute grains of zircon separated from several granites and a hornblende andesite from southwest Japan have been counted with the Fuji ET-2E stripping type ...nuclear emulsion. Since the alpha-tracks are easily comparable under the microscope with other crystal features of zircon, the alpha-activity is effectively useful as a guide in classifying this mineral into several types, by which the behaviour of the minerals and the rocks may be clarified. Some Cretaceous granites in southwest Japan contain zircons variable in colour, crystal habit and alpha-activity. Zircons associated with monazite or thorite in some granites are less radioactive than usual zircons.show more
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11_01_p049