撞击坑统计定年法及对月球虹湾地区的定年结果

撞击作用是行星形成和表面重塑的重要地质过程，记录和揭示了行星的演化历史.撞击作用形成的撞击坑可用于研究天体表面地质单元形成的时间.依据内太阳系天体表面的撞击历史，总结了通过对撞击坑的直径和频率分布进行统计，计算天体表面模式年龄的原理和方法.在此基础上，利用美国“月球勘测轨道器(LRO)”广角相机获得的图像，对月球虹湾地区的撞击坑进行了直径-频率分布统计研究，获得其3个主要地质单元的绝对模式年龄分别为3.33 Ga、3.21 Ga和2.60 Ga，有效限定了本区主要地质事件发生的时间. 

Crater Size-Frequency Distribution Measurements and Age Determination of Sinus Iridum

Impact cratering is an important process in planet formation and surface modification.It creats impact craters on the surface, which records and reveals the geological history of the planet. It is known that the younger a surface is, the less amount and smaller diameters the craters on that surface are. Therefore, model ages of a surface region of a solid celestial body can be estimated by measuring the crater size-frequency distribution. We summarized the principles and its application, and applied the method to the age determination of Sinus Iridum on the Moon using images obtained by Lunar Reconnaissance Orbiter Wide Angle Camera. Our results show that this region has three main geological units with model ages of 3.33 Ga, 3.21 Ga and 2.60 Ga, respectively.