国外电子探针铀-钍-铅定年方法及其在构造分析中的应用前景

对电子探针U-Th-Pb定年方法的基本原理、样品的制备和分析、年龄计算方法和误差分析进行了较系统的介绍,并对电子探针定年在构造分析中的应用前景作了展望.电子探针定年方法适用于经历了包括流体作用和重结晶作用变质事件的单一和复杂成因的独居石、锆石矿物,不仅是一个评价变质和变形时间的有效普查工具,而且它的原位性和高分辨能够用来制约构造变形和变质作用过程的绝对时间和速率,在构造分析中具有广阔的应用前景.

U-Th-Pb Dating by Electron Microprobe and Its Application in Structural Analysis

This paper systematically introduces the basic principle, sample preparation, analytical procedure, age and error calculation in U-Th-Pb dating by electron microprobe and also gives the prospect of application in the structural analysis. The development and application of the electron microprobe dating show that this method is rapid, reliable, inexpensive and suitable for both simple monogenetic and polygenetic monazite and zircon undergone metamorphic events involving fluid interaction and recrystallization. Electron microprobe dating is an efficient reconnaissance tool for evaluating metamorphic and deformational age domains. But more importantly, its in-situ nature and high spatial resolution can be used to constrain on the absolute time and rates of metamorphic and deformational processes. Thus it has a wide application prospect in the structural analysis.