单锆石定年样品的采集及矿物分选

Sampling and Mineral Sorting for Single Zircon U-Pb Dating

本文介绍了单颗粒锆石U -Pb同位素稀释法的采样及加工处理过程。对采集何种岩石类型、样品重量和如何对样品进行粉碎。

The sampling and zircon separation for single zircon U Pb dating were expounded in detail in this article. The analytical objects for single zircon U Pb dating are the zircons which were detail in this article. The analytical object for single zircon U Pb dating is the zircons which were contained in most igneous rocks. Before sampling, we should know about the regional geological setting in order to determine the collected rocks. According to the contents of the zircons in selected rocks, which are closely related to the acid of the specimens, we can collect adaptive weight of unweathered rocks, about 4～10 kg for acidicrocks,and about 40～50 kg for basic rocks in general.After that,the samples underwent powdering,gravity separation and magnetic separation.Finally,based on different purposes,we could sort the corresponding crystal forms of zircons for U-Pb isotopic dilution dating,with a binocular microscope.