质谱计逐级蒸发-沉积测定单颗粒锆石年龄原理及可靠性的证明——兼论锆石同位素地质年代学的适用性

讨论了锆石由于铅丢失造成自晶体表层到晶体内部放射成因207Pb/206Pb的变化趋势，热离子质谱计直进行单颗锆石石蒸发-沉积测年时，锆石在灯丝上加热蒸发和在冷灯丝上沉积时物质的分布状况，锆石中的U-Pb体系是否为封闭体系的判别标志，并对锆石年代学的适用性进行了讨论。

Principle of the single-zircon stepwise evaporation-deposition technique and the applications of zircon geochronology

The principle of the single-zircon stepwise evaporation-deposition technique,the correct data getting and the application are discussed in this thesis. When a crystal of zircon is being evaporated on a thermal ionization mass spectrometer,the ratios of (207Pb/206Pb)increase with time.It means that the lead loss in the inner layer of the zircon is smaller than the outer.The values of the crystal domain,where almost the enclosed systems exist,of a zircon may be the maximum otherwise there are two or more zircon generations.The key of the technique is to obtain the (207Pb/206Pb)value of the crystal domain.