摘要
撞击坑统计定年法的基本原理是首先得到月球表面撞击坑密度分布的一般规律(即产率函数),然后将其应用到Apollo和Luna任务采样的区域中,得到大于特定直径(常用1 km)的撞击坑密度,然后在该密度和样品的同位素年龄之间建立函数关系(即年代函数)。在对没有样品的地质单元进行年龄分析时,首先从遥感影像解译撞击坑,然后根据产率函数求解大于指定直径撞击坑的密度,最后将其代入年代函数中求解该区域的地质年龄。根据其它行星与月球撞击环境的差异等因素,该方法已经推广到其它行星表面地质年龄的研究中。本文详细分析了撞击坑统计定年方法的原理,以及在应用中需要注意的问题。
The basic principle of planetary surface dating method based on the crater size-frequency distribution measurements is to firstly obtain the general law of the impact crater size-frequency distribution on the lunar surface(i.e.the production function),to then apply the general law into the areas sampled by the missions of Apollo and Luna for obtaining the distribution density of impact craters whose sizes are larger than the particular diameter(usually 1 km),and to finally fit a functional relationship(i.e.the isochron function)between the densities and the corresponding ages of samples from the isotopic dating.For dating the surface of a geologic unit without being sampled,the craters were firstly mapped in the remote sensing images,then the distribution density of craters whose sizes are larger than the particular diameter was derived with the production function,and finally the surface age of the area was solved by substituting the above distribution density of craters into the isochron function.The method has been generally applied to the study of surface dating of other planets according to the difference of crater impacting environments of other planets and the Moon.In this paper,we have introduced the principle of the planetary surface dating method based on crater size-frequency distribution measurements and analyzed some related issues which must be paid attention to in the application of the planetary surface dating method.
作者
岳宗玉
邸凯昌
刘建忠
YUE Zong-yu;DI Kai-chang;LIU Jian-zhong(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100101,China;Institute of Geochemistry t Chinese Academy of Sciences,Guiyang 550081,China;CAS Center for Excellence in Comparative Planetology,Hefei 230026,China)
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2021年第5期1130-1142,共13页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家自然科学基金项目(41941003,41972321,41773065)
中国科学院前沿科学重点研究计划(QYZDY-SSW-DQC028)。
关键词
撞击坑统计定年
月球
类地行星
the planetary surface dating method based on the crater size-frequency distribution measurements
the Moon
terrestrial planets
