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中文摘要：
火山碎屑岩由于其复杂的物源使得诸多年代学方法难于适用。透长石激光单颗粒熔融^40Ar/^39Ar法可以有效地区分混入的老物质和遭受后期蚀变的矿物，因而使得年龄测定更为准确和精确。侧重碎屑岩激光^40Ar/^39Ar定年方法探讨，对浙江东部磨石山群的火山碎屑岩进行了测定，获得一些初步结论，其中茶湾组底部的年龄为（113．7±0．3）Ma，西山头组下部为（116．4±0．4）Ma，高坞组底部为（118．4±0．4）Ma。这些年龄结果比原来认识的要年轻，并且这些巨厚的火山沉积地层是在较短的时间段内形成的。
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