矿床同位素定年方法的应用现状评析

高质量的年代学数据是矿床研究和对比的基础.针对近二十几年来在具体矿床同位素定年研究中,不同学者对同一矿床采用不同的定年方法常常得出相差十分悬殊的结论,甚至出现与地质事实截然相悖年龄数据的现象,文章对最常用的锆石U-Pb法、自生伊利石K-Ar法、金属硫化物Re-0s和Sm-Nd法、石英流体包裹体40Ar/39Ar法和Rb-Sr等时线法以及释光测年进行了评析.强调一套合理的矿床同位素年龄数据的获得,必须加强对地质背景的研究;明确测年矿物与矿化的成因联系,选择合适的定年方法.综合地质背景及可靠准确的年代学数据,对地质事件与成矿事件的联系做出合理的解释.

APPLICATION STATE OF ISOTOPIC DATING METHODS FOR ORE DEPOSITS

High quality chronology data are the base for research and contrast of ore geology. Considering many reports of great disparity and even complete contrariety for the same deposit by different dating methods and by different researchers are very common in recent years, this paper focuses on commenting zircon U - Pb method, authigenic illite K - Ar dating technique, sulfides Re - Os and Sm - Nd method, quartz fluid inclusion ^40 Ar/^39 Ar and Rb -Sr isochrone dating, and luminescence measurement. At the same time, it is emphasized that getting a suite of reasonable age data one should pay attention to the study of geological background and define the relationship between the dating minerals and mineralization in order to select suitable dating methods. Synthetically considering mineralization setting and the truth and reliability of chronology data. genetic relationship between geology event and ore -forming events can be reasonably explained.