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The Thermal Effect of a Basalt Intrusion on Fission Tracks in Quartz Monzonite

The Cathedral Peak Granite, a body of quartz monzonite in Yosemite National Park, California, is intruded by a basalt plug approximately 320 feet across. Fission tracks in the quartz monzonite were partly obliterated close to the basalt, thus differentially reducing the fission-track ages of different accessory minerals. Apatite and sphene from samples within 5 feet of the contact yield concordant fission-track ages averaging 9.4 ± 0.2 m.y.; from samples more than 500 feet from the contact they yield ages averaging 80.7 ± 0.4 m.y. At intermediate distances, apatite yields younger ages than sphene and is affected at greater distances from the plug. By using experimentally determined annealing curves, maximum temperature at each sample location was estimated from the percentage of tracks lost. Estimates based on sphene are in good agreement with calculated maximum temperatures, whereas estimates from apatite data are not.