泛等时线法同位素定年的理论构想  

Theoretical Supposition of Universal Isochron Dating

作　　者：侯广顺[1,2] 李冉[1] 向世红 支风岐 齐永安[1] 吴成斌[1] Hou Guangshun Li Ran Xiang Shihong Zhi Fengqi Qi Yong＇an Wu Chengbin

机构地区：[1]河南理工大学资源环境学院,河南焦作454003 [2]河南省有色金属地质勘查总院,河南郑州450052

出　　处：《科教文汇》2016年第29期182-183,共2页Journal of Science and Education

基　　金：国家自然科学基金项目(41003015);河南省博士后基金项目;河南理工大学博士基金项目

摘　　要：等时线法同位素定年是经典的地质年代学方法,并衍生出内部等时线和亚样品等时线等方法。根据等时线法的基本原理及前提条件,本文提出了泛等时线定年的理论构想。以Rb-Sr法为例,可以证明,用矿物+全岩构建的内部等时线与全岩等时线属于同一直线方程。用某一样品的单矿物外加其他若干全岩样品也能构成等时线。这种泛等时线可以结合不同等时线法定年的优点,避免其缺点,更有利于定年。The isochron line geochronological dating is the classical method in geochronology, and minerals internal iso-chron and sub-sample isochron as the derivatives of this meth-od. Following the basic principle and precondition, this paper puts forward the universal isochron method for geochronology. Taking Rb-Sr isotopic system as a sample, it can be proved that the internal isochron equation of minerals and the whole rock is the same as that of the isochron line of some whole rocks. Some whole rocks and minerals from one another rock can also form one isochron line. This kind of universal isochron combines the advantages of internal isochron line and whole rocks line, and avoids the disadvantages. This method provides more choice to geochronological dating.

关 键 词：等时线法定年 全岩等时线 内部等时线 泛等时线 

分 类 号：P597[天文地球—地球化学]