岩石同位素年龄的理解与使用  

THE UNDERSTANDING AND USAGE OF ISOTOPIC DATINGS OF ROCKS

作　　者：邢凤鸣 

机构地区：[1]安徽省地质科学研究所

出　　处：《安徽地质》1992年第3期55-61,共7页Geology of Anhui

摘　　要：用同位素测定岩石年龄的方法,在地学中应用甚广。常见的方法有:K-Ar、Rb-Sr、U-Pb、Sm-Nd和⁴⁰Ar-³⁹Ar法等。对测定不同地质条件下各类岩石的年龄资料,多见诸于地质文献中。但由于地质情况复杂多变,故可使用的测年方法均有其特定的条件和适用范围,若对采样部位的地质情况不了解,选用的测年方法不当或测试结果不正确,则往往不能获得该被测对象的确切年龄并造成使用者的困惑。因此正确理解各种同位素测年方法的原理及适用范围,采样部位的地质条件及岩性,鉴别同位素年龄数据的可靠性,是需要仔细分析,认真对待的间题。本文就此类问题,应用实例进行探讨。Isotopic dating methods are widely used in prtrology such as K-Ar, Rb-Sr, U-Pb, Sm-Nd,^(4')Ar-^(39)Ar,etc. Ages for various types of rocks are mostly documented. Due to the complex- ity of geological conditions, either an incorrect sampling or a misused dating method or even inaccurate measurement will give bad knowledge of the subject and confuse the user. So it is important to recog- nize the principles of various isotopic methods and their extent as well as geological conditions and lithology of the sampling places and the reliabilty of age data. This paper is based on examples.

关 键 词：同位素测年 模式年龄 理解与使用 

分 类 号：P5[天文地球—地质学]