月球风暴洋地区元素丰度研究：“嫦娥二号”X射线谱仪探测数据分析  

Element abundances in Oceanus Procellarum:Data analysis of Chang'E-2 X-ray spectrometry

作　　者：班超[1,2,3] 郑永春[1,2] 张锋[1,2,3] 朱永超[1,2,3] 邹永廖[1,2] 

机构地区：[1]中国科学院月球与深空探测重点实验室 [2]中国科学院国家天文台,北京100012 [3]中国科学院大学,北京100049

出　　处：《地学前缘》2014年第6期62-73,共12页Earth Science Frontiers

基　　金：西部之光人才培养计划“联合学者”项目(048/2012/A2)~~

摘　　要：月球表面的元素丰度是研究月表物质分布的基础数据,可以提供月球地质演化历史的重要信息。探月工程"嫦娥二号"卫星搭载了一台X射线谱仪,自2010年10月1日发射以来,获得了丰富的观测数据。在X射线谱仪长达7个月的对月球观测期间,发生过多次太阳爆发。文中利用2011年2月16日9时一次太阳M级爆发事件时X射线谱仪的观测数据,建立了定量反演元素丰度的方法,获得了月球正面风暴洋地区Mg、Al、Si、Ca和Fe的含量。通过各区域的元素含量比较,从风暴洋南部沿飞行轨迹向北,Si含量逐渐升高,这种差异可能反映了不同时期玄武岩浆的成分差异。Ⅱ区域的Fe含量高于其他5个区域,但Ca、Mg、Al含量低于其他5个区域,说明II区域相对其他地区受高地物质的混染影响较小。月球风暴洋中6个探测区域的元素平均含量分别是Mg 7.3%、Al 8.4%、Si 15.8%、Ca 6.0%、Fe 18.6%。最后,分析了"嫦娥二号"XRS数据反演月表元素含量可能存在的误差。Element abundances of lunar surface material is one of the important clues to study the geologic history of the Moon.China＇s Chang＇E-2（CE-2）lunar orbiter carried an X-ray spectrometer（XRS）to map the element abundances on the lunar surface.During seven months XRS observation to the lunar surface,several events of solar flares occurred.The X-ray solar monitor onboard recorded simultaneous spectra of solar X-ray.In this paper,the XRS data obtained during an M solar flare event occurred on Feb.16,2011 are selected for quantitative inversion of the element abundances,and the contents of Mg,Al,Si,Ca and Fe in Oceanus Procellarum region on the nearside of the moon are presented.The comparison of the element contents from six regions found that from south northwards,the Si content along the orbital track is increasing.It might reflect the different composition of the erupted lavas during the filling history of the maria basins.The region II has higher Fe content than the other five regions.However,the Ca,Mg,and Al contents are lower than those from the other 5regions.It suggests that the surface material in the region II is the least contaminated by the highland material.The average abundances of the elements obtained in Oceanus Procellarum are Mg 7.3%,Al 8.4%,Si 15.8%,Ca 6.0%,Fe 18.6%,respectively.Finally,we also discussed the factors that influence the accuracy of the inversion of element abundances.

关 键 词：定量反演 元素丰度 X射线谱仪 “嫦娥二号” 风暴洋 月球 

分 类 号：P184.5[天文地球—天文学]