Abstract
Fission-track ages were measured for zircons in five quartz-diorite samples from the Tanzawa pluton in the southern Fossa Magna, central Japan. The results show discordant ages from 3.5 to 3.9 Ma on internal surfaces and 7.2–7.6 Ma on external surfaces of zircon. Combined with the cooling rate of the pluton, estimated from the K-Ar ages for hornblende and biotite (Sato et al. (1986) J. Geol. Soc. Japan 92 , 439–446), the fission-track age data could indicate that the closure temperature is 210°C for internal surfaces and 390°C for external surfaces of zircon. This conclusion is tentative, however, and other explanations for the results are possible.
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Schedule a callMore From: International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements
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